I live near a highway, maybe 2 km away. At night the trucks come down the hill and head towards the harbour. A part from the highway moving through a valley, the Jacob Brake sound that BELLOWS from those machines in the dead of night is something I always cherish.
When I see a "No Jake Brake" sign, I think of this: The sound of my jake brake is quieter than the sound of my 80,000 pound truck crashing through your house.
as far as ive seen those signs are in areas where it is not needed and is not necessary and are usually in residential areas. so if you are going the posted speed limit or whatever you deem to be safe then you will be fine but if you are going faster than you know you should be to the point where you need to drop 10 or more mph to go around a curve then that is your fault.
Bisbee has a steep grade and just feet south and down of US 80 on this part are public and private buildings. Los of control could result in the city facing the question, how do we retrieve a tractor/trailer off the roof and the second floor of the library and what's the cost of fixing it? Is it worth it because of it's historical significance to not only the city but the county and state as well? Will the feds help, since the post office occupies the first floor? There is also a large presence of Environazis here as well. The kind that is in large part responsible for Phelps Dodge (now Freeport-McMoRan) all but leaving.
You guys must be living a ways from any major highway with hills and don't have to listen to that crappy noise 24/7. I feel sorry for people who've inherited a jake brake fetish. They could care less about neighborhood peace and quiet.
He forgot one fact - the Jake Brake was actually invented by Clessie Cummins, the man who started the Cummins Engine Factory. There's quite a bit of history behind it.
And the first one ever installed was on his boat. So, when you rev the engine and let the brakes roar, you're carrying on a tradition older than the production of Jake Brakes.
@@P7777-u7r When Clessie Cummins invented the Jake Brake, he was no longer in control of the Cummins Engine Factory, and the people who were in control at that time would not agree to manufacture the Jacobs system, so Clessie Cummins was forced to look for another manufacturer. He found the Jacobs Lock company, who agreed to take it on as they had the necessary manufacturing capability and were in the process of looking for a new product. That's why it's called a Jacobs Brake and not a Cummins Brake. Cummins Engine refused to fit the Jacobs Brake to their engines for some years as they didn't believe it was beneficial to them. Big Mistake! I believe that it was Clessie's Sons who had taken over, but I'm not 100% sure of that.
@@P7777-u7r When Clessie Cummins invented the Jacobs Brake he was no longer in control of the Cummins Engine Company, and they refused to have anything to do with it, so he had to find another manufacturer. That's when he approached the Jacobs Lock company. They had the manufacturing ability and were looking for a new product, so they took it on. That's why it's called a Jacobs Brake, not a Cummins Brake. Cummins still refused to fit it to their engines for some years. Big Mistake! All this is in Clessie Cummins book "The Fire Within". Good reading, that one.
When I as a kid.. My dad was a trucker. In PA they had certain places where a Jake Brake was required. The cops, who are always your friend and concerned for our safety, would listen for the sound of the brake to make sure you were in compliance.
Good, force or threat is the only way to make wild people stay inline. In my area, it is abused because no one baby sit these inconsiderate fools that make unnecessary noise all day long. As long as they have to pay, they obey.
I'm a little suspicious of this "requirement". I used to drive trucks and not every truck had an engine brake. I've driven in 47 states and have no recollection of anywhere that "required" an engine brake. The responsibility of safely descending any grade has always come down to the driver, not a "requirement" to use a certain type of optional equipment. The opposite is definitely true though. There are many, many places that prohibit the use of engine brakes, and that is something that those friendly cops could be listening for to ensure compliance.
I thought Vail had "no jake brake" signs everywhere, because they prefer truckers fading brakes and killing minivans full of kids, versus having to hear that ghastly noise.
To be fair, I too get annoyed at truckers who purposely mod to make jake louder, it's incredibly disrespectful and equates to being a 13 year old attention whore on tiktok. All jakes should be somewhat muffled by federal law.
I was amazed at how well the Jake worked when my company went over to automatics...I ran a ton of WV and Pa, and other assorted states, and even at near gross the transmission/Jake kept my speed under control...I often wonder how old truckers managed without a Jake...
@@549BR well, yeah...I grew up near Old Fort, and trucks would go down that mountain at a crawl speed...when I began driving thinking about what gear to go down any particular hill, and having a Jake, was still a thing...I smoked my brakes 3 times over the years...once I was able to stop and just sit and let them cool...twice I was able to catch a lower gear...as I was close to hanging it up I still saw trucks smoking brakes, and today I know it still happens...it seems more frightening seeing it from in a car, and knowing what is going on...
@@690_5 That's because diesels generally don't have throttle plates, so they don't generate very much engine braking, unless your tractor is very old and has a gasoline engine.
@@michaelbenardo5695 exactly that’s why they have runaway ramps on mountains diesels will run away because they rely on fuel injection instead of a throttle valve like a gas engine
Andrew Gems a professional driver doesn’t care about the noise. They care about getting the load delivered safely. What you are referring to is a bunch of fucking hillbillies who think they have to be making excessive noise in order to make money. Jacobson knows what they are doing. They’ve been doing this for many years. Perhaps you idiot truck drivers could learn something from them and quit worrying about the noise and start focusing on your job.
I had a V8 Cummins 903 years ago and couldn't wait to get into a town and release the Jake beast. It had it's own style of bark for sure. Loved it. But in serious measure it worked well if driven correctly. I always use the philosophy of using the same gear downhill as i would uphill and never had a problem. Could flick the Jake between half and full depending on what it was doing. In the wet empty could catch you out if switched on full retardation, the rear wheels would actually lock up and slide. The switch on full going uphill at 40 ton I could change the RR up as it brought the revs down very quickly, trying that without the Jake was a waste of time.
@@westvalley411 no, it’s the guy with the man purse that moved from California to ruin everything. The little old lady can’t stand that guy, not the trucks.
I don’t know if it’s a Jacobs on my Volvo D13 engine but that is one of the strongest engine/exhaust brakes I’ve had on a truck in my 30 years of driving them
The concept is the same but Volvo sold it as VEB (Volvo Engine Brake). Basically it's the same by manipulating the valve timing/compression release brake.
I might help you there! Imagine having big coil springs on the soles of your shoes. If you jump you will compress the springs and they will hurl you back up in the air. Your downward force is storing energy in the springs, and it is given back to you by uncoiling all that stored energy and sending you at least some of the way back into the air with no effort from you other than what you add by jumping back up at the same time to achieve equal or even greater height than before! Now imagine you were jumping on a sheet of plywood suspended off the ground and at the moment the springs collapsed to their maximum point they shot right through the plywood! You would simply land hard and all that stored energy would be wasted! A trampoline would be similar- it stores and releases energy also unless your feet tear through at the bottom of the downward stroke! Now on to the engine. When a piston is in a compression stroke, and imagine you add NO fuel shot at that moment, the piston would "spring" back down just from the stored energy alone in the compressed air at the top of the stroke. NOW, if "something" (the Jake mechanism) opens the exhaust valve at that exact moment when the maximum energy is stored in the highly compressed air, all that energy will be "wasted" when it goes roaring out the exhaust pipe instead of boosting the piston back down. It took a lot of horsepower (COMING FROM THE WHEELS NOW THOUGH SINCE YOU ARE PLANNING TO STOP AND THE WHEELS ARE DRIVING THE ENGINE) to compress all that air, and instead of recovering the "spring" effect it is wasted out the exhaust! It is the SAME principle of driving an air compressor with an electric motor! Horsepower used up in compressing the air and no recovery of energy in the air compressor cylinder. It all leaves the compressor cylinder through a "type" of exhaust valve! So you see that any horsepower delivered to the engine THROUGH THE WHEELS is used up with the Jake system, AND IT AMOUNTS TO BRAKE POWER! SOMETIMES MORE THAN THE RATED HORSEPOWER OF THE ENGINE, SINCE "BRAKING HORSEPOWER" OF 10 BRAKE DRUM/SHOE COMBINATIONS CAN BE CONSIDERABLY MORE THAN THE FEW HUNDRED HORSEPOWER OF THE DIESEL ENGINE WHEN IT IS POWERING THE REAR WHEELS! A very interesting thing is this: AN AMATEUR in a truck can CRASH the truck if he is not loaded, OR if there is ice or EVEN RAIN on the road and all that power available inside the engine COMPLETELY STALLS THE ENGINE AND OF COURSE STOPS THE WHEELS FROM TURNING AT ALL!! Just like slamming on the brakes he will Jacknife before he ever recovers any means to get those wheels turning again and the engine running again!!!
@@mikep.541 l guess you must be BRILLIANT and understand EVERYTHING.................ROCKET ENGINES,,,,,,,,,,THE HYDROGEN BOMB,,,,,,,,,,,,,3 PHASE ELECTRIC,,,,,,,,,,,,,,ETC,,,,,,,,,,,YES OR NO..
Let me help you...and for a good reason, they don't tell you what is going on...it's very hard on your engine.. they open the exhaust valve at top dead center, venting the compressed air.. valves closed, no air in cylinder and the piston starts down..what happens next? That's right, you pull a vacuum, until you suck the valves open.. you stress the entire engine backwards.. I have seen the tops of Pistons sucked off, rod bolts broken, wrist pins snapped.. Your Jake isn't as strong, in your older truck? Replace the worn out valve springs!!! Or put stiffer ones in, and get a Jake from hell.
I spent my teen years near a highway, freeway and train tracks. When I moved there was still a set of tracks but it took quite awhile to get used to no Jake Brakes.
@@nthgth If he mentioned that then the green people would chase him down and state he was causing global cooling, warming, maybe the seasons changing due to global orbit around the sun?
You mean they engines are not perpetual motion machines? I'm shocked and disappointed about the the implication they byrn those dirty. smelly, global warming carbon emissions! ROTFLMAO
The Grapevine on I-5 is a great place for this. (I've heard it many a time while going north on I-5.) My parents had this put on their diesel Dodge Ram 1500 after running through an intersection coming downhill from Lake Tahoe. (This truck was used to haul a 5th wheel travel trailer which was attached at this particular time.)
Soooooooooo, instead of purchasing a truck that can safely haul a fifth wheel trailer, they added an engine break to a half ton NEVER designed for that kind of load. BRILLIANT
@@nicolaslugo2658.... "environmental issues"?!!?..... what Environmental issues?.... they're "banned" from use in populated ares by morons who seem to think that Jake brakes are just something for truckers to make noise with.
If anyone would like a real explanation of how engine brakes work there are plenty on other much better vids here on YT. This is more like an advertisement for the Jake brand.
Although the explanation is technically accurate, it should be emphasized that it uses compression to slow the engine (vehicle); then get to the details of valve operation and the fancy analysis of transferring kinetic energy to compression.
Seems sensible...... If you like sounds though, you want to hear a traditional engine brake in European trucks. Some have an exhaust valve that basically suffocates the engine. Makes it sort of cushion the pistons on the air trapped inside the cylinders. Sounds fantastic!
I love the sound of Jake brakes. I also took diesel engine mechanics in highschool and would have graduated with a diesel mechanic certification but the teacher quit halfway through the 5th of 6 half year courses, and they shut the program down and wouldn't count the previous 2 years of the class. I ended up giving up on that career after not wanting to have to completely restart the program after graduation and pay for the schooling. Now i mive and install office furniture...
@@jojogo22 I tend to not listen to most things as I sleep, because I'm usually sleeping. It's nice of you to assume that don't live near seemingly any roads, when I live 2 houses distance from a main county road that's one of 3 major roads going to out highways. I listen to every loud vehicle that passed, not just semi trucks. Every loud car, motorcycle, constant helicopters flying low enough that my windows shake, and white trash in the apartments behind me
All high schools should be mandated by law to have well equipped trades classes. It's outrageous that schools have been shutting down stops and trade education programs.
Probably the best invention ever designed for a diesel.. Thank you Mr. Cummins! Hard to believe, that the 1st Jacobs engine brake, was actually designed for Detroit Diesel. Mack's own Dynatard engine brake, was a good idea, but has hardly the braking effect, as the Jacobs. Keep up the great work!
mack dynatard is JUNK compared to a REAL JAKE BRAKE..............ALL THEY'RE GOOD FOR IS ALLOWING A FASTER SHIFT ON A LOUSY 5 SPEED MACK TRANSMISSION....
@@Icutmetal Because they are the same thing. en.wikipedia.org/wiki/Compression_release_engine_brake So nice to have so much info at your fingertips...try using it!
@@Icutmetal Yes, exactly the same purpose. To slow the engine. It is the SAME THING. Jake brake is just a nickname for a compression release. Did you even read? No? Didn't think so.
JacobsVehicleSystems that is one of the dumbest things I've ever seen, do you even know the proper use the engine brake? it's to help reduce speed on downward slopes to have less ware and tear on the brakes, there is no use or needs for them to be used in a town or a populated area unless you want to be fishing for attention
Thanks for your comment. Please find more information on our website about the noise you are hearing. "I'm bothered by the noise of big trucks using their Engine Brakes, what can I do? The federal government has required all vehicles manufactured since 1978 to meet noise requirements when delivered to the customer, so trucks have been required to meet the requirements when they leave the dealership as new vehicles for quite some time. The real problem here is modified or defective exhaust systems. The use of the engine brake is not the problem. Citizens and truck drivers can both do their part to keep the noise down. Citizens, encourage your local police to stop noisy vehicles and check them for muffler integrity. Truckers, if you know someone who is operating a vehicle with an excessively loud exhaust system, encourage him or her to fix it." www.jacobsvehiclesystems.com/about-us/environmental-health-safety/noise-concerns/
I live next to a railroad track in a small town. Yes, freight trains are required to blow their horns in the middle of the night too. We'll get trains coming through at all hours of the day or night and they're always required to blow their horns. It's a safety issue.
They're been adding that to muscle/pony cars forever, it'd be just as good an idea for a Jake brake. I'd be surprised if it hasn't been done (aftermarket)
@@Synthwave89 no such thing. Turn them off in residential areas. They are NOT necessary. They are and always will be a secondary helper brake. There is NO reason to HAVE to use it except in emergency and even then its going to be driver error...damn dude, people don't even know how to stab brake...watch them big trucks smoking brakes on a downhill...its not that they are heavy ...they are just going too fast and end up riding brakes=brake fade. Yes, weight is a factor. But the guy behind the wheel should know if his/her brakes are good...people don't even do PTIs anymore...not thorough ones. Ran an 88 Mack Superliner, NYC to landfills in PA, constantly 82,500 (used allowable percentage years back) 5 sometimes 6 days a week. Over the mountains in PA with NO ENGINE BRAKE. NONE. Most people don't know that trucks used to NOT even have steer axle brakes!
Can anyone explain why you wouldn’t just go into neutral? If the energy isn’t being given back to the engine with the expansion cycle, why even use the fuel? I mean I guess the engine is gonna be running regardless but
I loved you’re world view map at the end of the video, with over 700,000 trucks in the +4500kg range, you chose to omit Australia.Neglectful but completely understood. In fact, what I was surprised about, was that you’re World View map included ANY land mass other than North America!
from the map in the clip, one might infer that 'jake brakes' are not sold or installed in trucks intended for use/sale in Canada - but almost every commercial truck I've ever driven had a Jake brake; who's giving bad information here?
Ahhh it introduces pumping losses with the intake valve(s)!! Genius! It makes so much sense, and it's so simple. Thank you so much, I always wondered this.
It brakes the piston on vacuum in 3rd phase because the 2nd phase "compression" is modified to absent compression. My question to Jacobs Vehicle Systems is does this vacuum Jake engine breaking system is the same effective as on older compression Jake engine breaking system or the benefit is only removing the noise but is not strong as old compression Jake engine brake?
As I understand it, they didn’t redesign anything to reduce the noise. The noise reduction happens because of the addition of emissions equipmnt to the exhaust system. It’s acting as a muffler and Jacobs is using that as a selling point.
@@ronaldscott781 exactly! The new emissions systems have many more components the exhaust has to pass through before exiting the exhaust pipe than the old muffler systems.
I don’t like loud noises but I have been loving the sound of Jake brakes on the occasion I hear them. Had to look them up and see why only some semi’s use them
Many people seem puzzled by fuel situation. In braking mode, no fuel is delivered because the driver's foot is off the accelerator pedal and engine rpm is above idle. Many people also seem puzzled by how braking is achieved. The clearest statement I've ever seen is from a service manual that said "the Jake brake achieves braking by using the engine as a power consuming air pump." Consider what would happen in a running diesel engine if something held the exhaust valves open a very small amount. An engine that has no clearance for fully open exhaust valves could accomodate having them open .025. It used to be called compression release in the days of outside rail 220 Cummins and starting aid system. Think about what happens if the valves are held open like that. Compression stroke drives air through the small opening of the part open valve, makes a partial stroke of high-pressure air which is dumped into the exhaust manifold as it's compressed. High pressure air pulse makes a sharp bark, and it takes a significant amount of energy to compress the air. Larger displacement engines should brake better, turboed engines likewise. Also explains the mediocre Jake on a Jimmy powered truck. Jimmies are smaller displacement for their horsepower, and their valve train doesn't lend itself as well to braking. Since the exhaust valves only cool during their dwell on the seat, extended engine braking gets the exhaust valves extremely hot. Brakes that brake stronger get the valves hotter. The gases in the cylinder during braking are very oxygen rich, since no combustion is happening. Very hot metal plus lots of oxygen is worse than heat alone. Even though they can create problems, the Jake is still one of the best inventions in the history of ever.
And now, from the department of things absolutely NO ONE ASKED FOR: "And with new emissions technology, the sound of the jake brake operating is all but eliminated"
Too bad the video never tells us HOW a jake brake mechanism works...that is, how exactly does it keep the exhaust valve open. Could not bother with that detail. What are service brakes? Are those what we normally call "brakes"?
Yes, service brakes are what the segment of population unfamiliar with proper vehicle nomenclature calls simply "brakes". The Jake Brake works by actuating the exhaust valve rather than the fuel injector. So... the intake air is compressed and then dumped slightly before TDC.
This also is explaining why you will see increase in boost pressure and egt will not drop as fast while using jake brake. Air cannot enter the engine as much, creating a airflow restriction making your boost gauge read up a bit, and egts will not drop as much or as quick due to heat energy being generated and not just allowing air to flow through if you have the brake off and no throttle applied. If you wait, you can actually watch your egt climb back up a little bit when you hit the jake brake.
@@MistaRoyanT I've driven a Detroit Series 60 with a burned out muffler and it sounded amazing. Truck was worthless and gutless but my engine brake never let me down.
What is the mechanism? I understand you guys probably cant say due to trade secrets/ proprietary technology, but is it some type of high pressure check valve?
If i had my way they would be fitted to every onroad diesel engine, petrol to if it was possible...would be a great addition to 4wds when they are towing
If you can't depend on your service brakes to save your life, you need better brakes. If mechanical brakes can stop an 80,000 ton train, stopping a 40-ton truck should be no problem.
So is fuel still injected during the compression stroke when the brake is on and the compression is sent out the exhaust valve? I would think it would be more economical to not inject fuel during the compression stroke since it would just be a waste.
@@1320fastback to a certain extent, you are correct, but not all the time. Certain conditions have to be met. You are referencing DFCO, which, depending on the vehicle tuning, requires certain speeds, rpms, and loads. DFCO works best when the timing is set to near 0, but you get no engine braking this way. Most manufacturers set DFCO timing to allow for a progressive engine braking curve, but this makes the system work less efficiently. Personally, I tune mine to limit engine braking to maximize the time DFCO is activated, except on towing vehicles, which I set for maximum braking. Also, modern automatic transmissions unlock the TCC at 0 throttle, thereby drastically reducing the braking effect during DFCO. This can NOT be changed by programming in most modern vehicles, so you are stuck with a shitty DFCO system that doesn't save much on gas.
The one aspect omitted in this video when explaining the four-cycle process: Nowhere was it told when the fuel was injected into the combustion chamber; as the narration told of air intake and compression, but no mention of the fuel combining with the air to make the combustion.
In a diesel, the high compression ratio causes the air to become super hot, so when the fuel in injected, it instantly combusts - diesels don't have a carburetor.
Fuel is only injected while producing power. No fuel is injected during coasting or engine braking, so no combustion occurs then. Since fuel is not part of the engine braking process, it is not shown in the animation. The _power cycle_ that occurs while fuel is being consumed becomes the _expansion cycle_ in the absence of fuel. Most of the energy used for compression is returned during the expansion cycle, so not much retarding happens during coasting. Opening the exhaust valve at the end of the compression cycle dumps that energy into the exhaust system before it can be returned during the expansion cycle. That immediate dumping of the compressed air is why the engine holds back more during engine braking than it does just coasting. It has everything to do with pumping air and nothing to do with fuel.
60 series Detroit 12.7 in our E-One Cyclone engine, 8" straight dumping out the passenger side, you get that truck loaded up 3 times (jake, throttle, jake, throttle, jake) on the 2-4-6 set on 6, then hit the throttle 1 more time, Cannon shot city complete with fireball
Every diesel engine should use this system. Are they used in public vehicles, like transit buses, or school buses? I would think it'd save on wear and tear on the service brakes.
They are used in transit buses and some school buses and so on. But there are different types of retarders ! Like engine brake , exhaust brake, jake brake
Braaaaaaa Brup Brup Brup Brup.... A sound that will be lost to history. The modern mandated emissions systems almost completely muffle it. I have mixed feelings about it. I love hearing it on the road but I'm not a fan of it when trying to sleep.
Is the non-combusted air mixture contained after it gets let out of the chamber? If it goes straight to the exhaust, wouldn't that be a waste of fuel? Or is there no fuel in the air that is put into the cylinder to begin with, when the Jake brake is applied?
When the jake is working the throttle is at idle. There is only a small amount of fuel going into the cylinders. That fuel is still being burned by the heat from compressing the air. It isn't just pushing fuel out of the exhaust.
On a modern diesel, the fuel is injected direct into the cylinder. When the Jake is actuated, the injector is cut off. Most modern trucks have 'dry idle' on the over-run...ie no fuel is injected when the truck is driving the engine rather than the engine driving the truck!
The sound of a engine brake on stage 3 is a warning to people I am slowing down, never understood why they wanted to eliminate that. My jakes are not as loud as a Hurd of fat guys on their Harley’s screaming though town !!
People who like the sound of Jake Brakes are probably there same ones that like the sound of unmuffled Harley's. "Sounds great to us; to hell with that the immediate countryside thinks."
I miss the old 2002 Freightliner I drove with the twin stacks and Jake Brake that really barked! Never got a ticket rolling down the I 35 hill into Duluth with it just roaring!
The Cummins ISX 15 has significantly greater engine braking power (250+hp greater) than the ISM, mainly due to the size difference and haul application. Which ISX configuration do you have and are you comparing the same loads?
I live near a highway, maybe 2 km away. At night the trucks come down the hill and head towards the harbour. A part from the highway moving through a valley, the Jacob Brake sound that BELLOWS from those machines in the dead of night is something I always cherish.
I too like waking up to the sound of tractortrailers, trains, planes, and even tanks
@@gm08351 or, if you are a schoolchild in the Ukraine, your school being shelled by Zelenskyy's "Nazis" who mysteriously never damaged a synagogue.
@@gm08351 better than waking up to them through your living room am i right.
Is that the only choice you have in life?
LOL! Are you mental? Unbelievable that ANYone would say something that dumb!
When I see a "No Jake Brake" sign, I think of this: The sound of my jake brake is quieter than the sound of my 80,000 pound truck crashing through your house.
Tommy W. Good point and I'm sure you're not rockin the Jig middle of the night with nobody on the streets im sure you're good boss!
I've never understood those signs. Jakes are for safety. That's like saying, "No Brakes". Sure, I'll coast around that curve. *smh*
as far as ive seen those signs are in areas where it is not needed and is not necessary and are usually in residential areas. so if you are going the posted speed limit or whatever you deem to be safe then you will be fine but if you are going faster than you know you should be to the point where you need to drop 10 or more mph to go around a curve then that is your fault.
Studies show that a Jake Brake makes less noise than a Semi crashing through an intersection.
Bisbee has a steep grade and just feet south and down of US 80 on this part are public and private buildings. Los of control could result in the city facing the question, how do we retrieve a tractor/trailer off the roof and the second floor of the library and what's the cost of fixing it? Is it worth it because of it's historical significance to not only the city but the county and state as well? Will the feds help, since the post office occupies the first floor? There is also a large presence of Environazis here as well. The kind that is in large part responsible for Phelps Dodge (now Freeport-McMoRan) all but leaving.
Sound ellimanated?!?! The sound is the best part!
Haha EXACTLY! BRRRRRRRRDDDDDDDRRRRRRR!!
yeah!
Booooooo! Jake rumbles are freakin' awesome!
RamblerTurbo hell yea
You guys must be living a ways from any major highway with
hills and don't have to listen to that crappy noise 24/7. I feel sorry for people who've inherited a jake brake fetish. They could care less about neighborhood peace and quiet.
Man I've always loved hearing a truck with jake brake on. I'm not even a truck driver.
ooh yeah
I feel like I’m slowly turning into Hank Hill. I was so satisfied watching this.
no shame in that mate, as long as u are a bit more open minded than hank that is!
You seen the episode where Hank rents a big rig and then navigates himself off the top of a mountain with no fuel or brakes? Best cartoon ever
Propane and propane accessories lol
Jake brake and Jake brake accessories.
I'll tell you what
He forgot one fact - the Jake Brake was actually invented by Clessie Cummins, the man who started the Cummins Engine Factory. There's quite a bit of history behind it.
And the first one ever installed was on his boat. So, when you rev the engine and let the brakes roar, you're carrying on a tradition older than the production of Jake Brakes.
I wonder why Cummins didn't just come standard with this built in
@@P7777-u7r When Clessie Cummins invented the Jake Brake, he was no longer in control of the Cummins Engine Factory, and the people who were in control at that time would not agree to manufacture the Jacobs system, so Clessie Cummins was forced to look for another manufacturer. He found the Jacobs Lock company, who agreed to take it on as they had the necessary manufacturing capability and were in the process of looking for a new product. That's why it's called a Jacobs Brake and not a Cummins Brake. Cummins Engine refused to fit the Jacobs Brake to their engines for some years as they didn't believe it was beneficial to them. Big Mistake! I believe that it was Clessie's Sons who had taken over, but I'm not 100% sure of that.
@@P7777-u7r When Clessie Cummins invented the Jacobs Brake he was no longer in control of the Cummins Engine Company, and they refused to have anything to do with it, so he had to find another manufacturer. That's when he approached the Jacobs Lock company. They had the manufacturing ability and were looking for a new product, so they took it on. That's why it's called a Jacobs Brake, not a Cummins Brake. Cummins still refused to fit it to their engines for some years. Big Mistake! All this is in Clessie Cummins book "The Fire Within". Good reading, that one.
@@P7777-u7rsome did, the C-Brake.
I couldn't imagine driving and not getting to hear the jakes rumble. That's the best part of trucking.
When I as a kid.. My dad was a trucker. In PA they had certain places where a Jake Brake was required. The cops, who are always your friend and concerned for our safety, would listen for the sound of the brake to make sure you were in compliance.
Get paid to listen to Jakes all day, what a life.
@@onefastslimjim 😊
Good, force or threat is the only way to make wild people stay inline. In my area, it is abused because no one baby sit these inconsiderate fools that make unnecessary noise all day long. As long as they have to pay, they obey.
now they fine ya for using the in many places
I'm a little suspicious of this "requirement". I used to drive trucks and not every truck had an engine brake. I've driven in 47 states and have no recollection of anywhere that "required" an engine brake.
The responsibility of safely descending any grade has always come down to the driver, not a "requirement" to use a certain type of optional equipment.
The opposite is definitely true though. There are many, many places that prohibit the use of engine brakes, and that is something that those friendly cops could be listening for to ensure compliance.
Thank you JacobsVehicleSystems for saving lives everyday.
You can drive with a Jake brake at full volume anywhere in Colorado. You would never hear it over the straight pipe Harleys.
With or without straight stacks? Several belly dumps and bull racks around here have straight stacks and it's music to my ears 😊
I thought Vail had "no jake brake" signs everywhere, because they prefer truckers fading brakes and killing minivans full of kids, versus having to hear that ghastly noise.
To be fair, I too get annoyed at truckers who purposely mod to make jake louder, it's incredibly disrespectful and equates to being a 13 year old attention whore on tiktok. All jakes should be somewhat muffled by federal law.
@@MockOverdrive Vail is a tourist trap these days, growing up just off of i25 i would hear them all the time.
@@MockOverdrive this is a 0 IQ comment lol
I was amazed at how well the Jake worked when my company went over to automatics...I ran a ton of WV and Pa, and other assorted states, and even at near gross the transmission/Jake kept my speed under control...I often wonder how old truckers managed without a Jake...
They did a lot of down shifting with their manual transmissions.
@@549BR well, yeah...I grew up near Old Fort, and trucks would go down that mountain at a crawl speed...when I began driving thinking about what gear to go down any particular hill, and having a Jake, was still a thing...I smoked my brakes 3 times over the years...once I was able to stop and just sit and let them cool...twice I was able to catch a lower gear...as I was close to hanging it up I still saw trucks smoking brakes, and today I know it still happens...it seems more frightening seeing it from in a car, and knowing what is going on...
@@549BRdown shifting really doesn’t slow you down like it would in a Car.
@@690_5 That's because diesels generally don't have throttle plates, so they don't generate very much engine braking, unless your tractor is very old and has a gasoline engine.
@@michaelbenardo5695 exactly that’s why they have runaway ramps on mountains diesels will run away because they rely on fuel injection instead of a throttle valve like a gas engine
I always wondered how those worked. Thank you for the informative video.
Agree jake brake sound needs to be louder we love the sound
ikr
alex Perez ya I love the sound
shane lord and even louder for the people that hate the jake brake.
GoodISnipr I legit cant understand people who fanboy over jake brakes sound, it sounds like a loud fart
Andrew Gems a professional driver doesn’t care about the noise. They care about getting the load delivered safely. What you are referring to is a bunch of fucking hillbillies who think they have to be making excessive noise in order to make money. Jacobson knows what they are doing. They’ve been doing this for many years. Perhaps you idiot truck drivers could learn something from them and quit worrying about the noise and start focusing on your job.
I love the sound of the Jake Brake it's the best sound you can hear on a Diesel engine
I had a V8 Cummins 903 years ago and couldn't wait to get into a town and release the Jake beast. It had it's own style of bark for sure. Loved it. But in serious measure it worked well if driven correctly. I always use the philosophy of using the same gear downhill as i would uphill and never had a problem. Could flick the Jake between half and full depending on what it was doing. In the wet empty could catch you out if switched on full retardation, the rear wheels would actually lock up and slide. The switch on full going uphill at 40 ton I could change the RR up as it brought the revs down very quickly, trying that without the Jake was a waste of time.
same gear down as over, or one less just to be safe. is what i learned. back in the day.
Wow. An old 903?!! 👍 What was it in?
Man everyone knows you never go full retardation...
WOW 903 YEARS AGO?
My dad straight piped his truck once and hit the Jake brake going through a small town, he got a ticket for the excessive noise. Lol good times.
But you forgot to mention that the ticket was issued by the next town and not the one he went through... ;)
Little old ladies have nothing better to do than call 911...don't walk on their lawn...
@@westvalley411 no, it’s the guy with the man purse that moved from California to ruin everything. The little old lady can’t stand that guy, not the trucks.
@@Californians_go_homeThose Calipawns ruin everything don't they
Good times? I'd give him jail time. Scumbag.
I have a series 60 dual 8 inch straight pipes and I love playing the music of my people! Loud and proud!
I don’t know if it’s a Jacobs on my Volvo D13 engine but that is one of the strongest engine/exhaust brakes I’ve had on a truck in my 30 years of driving them
The concept is the same but Volvo sold it as VEB (Volvo Engine Brake). Basically it's the same by manipulating the valve timing/compression release brake.
@@ajidamarjati
Also a valve in the exhaust, witch will cause backpressure to the engine
@@ajidamarjatiAlso called PowerLeash on the Mack engines
Still as clear as mud. They fail to tell you exactly WHAT happens when the system is applied.
I might help you there! Imagine having big coil springs on the soles of your shoes. If you jump you will compress the springs and they will hurl you back up in the air. Your downward force is storing energy in the springs, and it is given back to you by uncoiling all that stored energy and sending you at least some of the way back into the air with no effort from you other than what you add by jumping back up at the same time to achieve equal or even greater height than before! Now imagine you were jumping on a sheet of plywood suspended off the ground and at the moment the springs collapsed to their maximum point they shot right through the plywood! You would simply land hard and all that stored energy would be wasted! A trampoline would be similar- it stores and releases energy also unless your feet tear through at the bottom of the downward stroke! Now on to the engine. When a piston is in a compression stroke, and imagine you add NO fuel shot at that moment, the piston would "spring" back down just from the stored energy alone in the compressed air at the top of the stroke. NOW, if "something" (the Jake mechanism) opens the exhaust valve at that exact moment when the maximum energy is stored in the highly compressed air, all that energy will be "wasted" when it goes roaring out the exhaust pipe instead of boosting the piston back down. It took a lot of horsepower (COMING FROM THE WHEELS NOW THOUGH SINCE YOU ARE PLANNING TO STOP AND THE WHEELS ARE DRIVING THE ENGINE) to compress all that air, and instead of recovering the "spring" effect it is wasted out the exhaust! It is the SAME principle of driving an air compressor with an electric motor! Horsepower used up in compressing the air and no recovery of energy in the air compressor cylinder. It all leaves the compressor cylinder through a "type" of exhaust valve! So you see that any horsepower delivered to the engine THROUGH THE WHEELS is used up with the Jake system, AND IT AMOUNTS TO BRAKE POWER! SOMETIMES MORE THAN THE RATED HORSEPOWER OF THE ENGINE, SINCE "BRAKING HORSEPOWER" OF 10 BRAKE DRUM/SHOE COMBINATIONS CAN BE CONSIDERABLY MORE THAN THE FEW HUNDRED HORSEPOWER OF THE DIESEL ENGINE WHEN IT IS POWERING THE REAR WHEELS! A very interesting thing is this: AN AMATEUR in a truck can CRASH the truck if he is not loaded, OR if there is ice or EVEN RAIN on the road and all that power available inside the engine COMPLETELY STALLS THE ENGINE AND OF COURSE STOPS THE WHEELS FROM TURNING AT ALL!! Just like slamming on the brakes he will Jacknife before he ever recovers any means to get those wheels turning again and the engine running again!!!
Jeroen de Sterke Damn. You sure are dense.
@@mikep.541 Hurling insults and contributing nothing to the conversation isn't exactly the definition of intelligence.
@@mikep.541 l guess you must be BRILLIANT and understand EVERYTHING.................ROCKET ENGINES,,,,,,,,,,THE HYDROGEN BOMB,,,,,,,,,,,,,3 PHASE ELECTRIC,,,,,,,,,,,,,,ETC,,,,,,,,,,,YES OR NO..
Let me help you...and for a good reason, they don't tell you what is going on...it's very hard on your engine.. they open the exhaust valve at top dead center, venting the compressed air.. valves closed, no air in cylinder and the piston starts down..what happens next? That's right, you pull a vacuum, until you suck the valves open.. you stress the entire engine backwards.. I have seen the tops of Pistons sucked off, rod bolts broken, wrist pins snapped..
Your Jake isn't as strong, in your older truck? Replace the worn out valve springs!!! Or put stiffer ones in, and get a Jake from hell.
I spent my teen years near a highway, freeway and train tracks. When I moved there was still a set of tracks but it took quite awhile to get used to no Jake Brakes.
Straight pipes, Full Jake in a tunnel while down shifting = AWESOME!
Tunnels and overpasses are the s**t!
"I shall play for you the song of my people."
@@josephastier7421 BBBBRAAAAAAAAGAGAGGGGAGAGAGAGAGHHHHHHHHHHHHHH
@@josephastier7421*straight pipe no muffler*
idiot
What's that one stroke called when it makes all its power? Oh that's right! The expansion stroke!
i htought that to be kinda funny meself .
Yeah it was kind of weird how he seemed to blatantly avoid mentioning the fuel burning
@@nthgth If he mentioned that then the green people would chase him down and state he was causing global cooling, warming, maybe the seasons changing due to global orbit around the sun?
Combus...exapansion!
You mean they engines are not perpetual motion machines? I'm shocked and disappointed about the the implication they byrn those dirty. smelly, global warming carbon emissions! ROTFLMAO
I've never heard the "Power Stroke" called the "Expansion Stroke" before. Love Jake brakes though!
The Grapevine on I-5 is a great place for this. (I've heard it many a time while going north on I-5.)
My parents had this put on their diesel Dodge Ram 1500 after running through an intersection coming downhill from Lake Tahoe. (This truck was used to haul a 5th wheel travel trailer which was attached at this particular time.)
Soooooooooo, instead of purchasing a truck that can safely haul a fifth wheel trailer, they added an engine break to a half ton NEVER designed for that kind of load. BRILLIANT
@@bobward7489 Nope, it's a grade that many have encountered before that overwhelms their tow vehicles. It's a road that they did by mistake.
@@LadyAnuB Regardless, hauling a fifth wheel with a half ton truck is dangerous and irresponsible.
This is the exact place I look forward to driving through when driving back from Los Angeles so I can hear the Jake Brakes. 👍👍
You can't put a Jake on a half ton. Don't know what they told you but it's wrong.
The Jake brake on our Internationals are very quiet, I can ignore those "No Engine Brake" signs.
I ignore them anyway. Jake Brakes are safety devices.
I thought they banned them because of environmental issues.
@@nicolaslugo2658.... "environmental issues"?!!?..... what Environmental issues?.... they're "banned" from use in populated ares by morons who seem to think that Jake brakes are just something for truckers to make noise with.
@@Romans--bo7br mufflers stop the Jake sound effects..
The purses and tampons that come standard on an international provide extra sound dampening lol
If anyone would like a real explanation of how engine brakes work there are plenty on other much better vids here on YT. This is more like an advertisement for the Jake brand.
That, and they forgot to even mention the whole fuel injection part of how an engine works in this video.
@@drumset09 I noticed that, too, as the video gives the impression of diesel engines being powered by air.
Although the explanation is technically accurate, it should be emphasized that it uses compression to slow the engine (vehicle); then get to the details of valve operation and the fancy analysis of transferring kinetic energy to compression.
Thank you. That makes better sense to a dummy like myself.
@@chickey333 Me too ..
@@mikestudmuffin4549 How? The volume is being compressed, not expanded.
This is posted by someone who missed the fundamental reason for how it works. 😊
@@LTV_inc Compression is not what absorbs the energy? That is the fundamental.
Seems sensible......
If you like sounds though, you want to hear a traditional engine brake in European trucks. Some have an exhaust valve that basically suffocates the engine. Makes it sort of cushion the pistons on the air trapped inside the cylinders. Sounds fantastic!
Isn't that the system that Caterpillar uses?
I love the sound of Jake brakes. I also took diesel engine mechanics in highschool and would have graduated with a diesel mechanic certification but the teacher quit halfway through the 5th of 6 half year courses, and they shut the program down and wouldn't count the previous 2 years of the class. I ended up giving up on that career after not wanting to have to completely restart the program after graduation and pay for the schooling. Now i mive and install office furniture...
You love the sound of Jake brakes because you don't have to listen to them when you're sleeping at night.
@@jojogo22 I tend to not listen to most things as I sleep, because I'm usually sleeping. It's nice of you to assume that don't live near seemingly any roads, when I live 2 houses distance from a main county road that's one of 3 major roads going to out highways. I listen to every loud vehicle that passed, not just semi trucks. Every loud car, motorcycle, constant helicopters flying low enough that my windows shake, and white trash in the apartments behind me
I think you made a big mistake not starting that over.
And this is from someone who also had to restart their trade school.
@@davecrupel2817 I think that all of the time 😐
All high schools should be mandated by law to have well equipped trades classes. It's outrageous that schools have been shutting down stops and trade education programs.
Glorious sound. The freeway is over a mountain from me, i can hear the jakes from time to time. I picture them delivery my case of Laphroig
2:34 You say that like it's a good thing....
Probably the best invention ever designed for a diesel.. Thank you Mr. Cummins! Hard to believe, that the 1st Jacobs engine brake, was actually designed for Detroit Diesel. Mack's own Dynatard engine brake, was a good idea, but has hardly the braking effect, as the Jacobs. Keep up the great work!
mack dynatard is JUNK compared to a REAL JAKE BRAKE..............ALL THEY'RE GOOD FOR IS ALLOWING A FASTER SHIFT ON A LOUSY 5 SPEED MACK TRANSMISSION....
@@yardlimit8695,Some braking from the Dynatard, is also better than none at all.. Lol!
Had a dirt bike back in the 70s with a compression release. Didn't sound quite as good but did the job.
What the hell does that have to do with a Jake brake?
@@Icutmetal Because they are the same thing.
en.wikipedia.org/wiki/Compression_release_engine_brake
So nice to have so much info at your fingertips...try using it!
@@Not_Sure-2020 Used for the same purpose? Didn’t think so.
@@Icutmetal Yes, exactly the same purpose. To slow the engine. It is the SAME THING. Jake brake is just a nickname for a compression release. Did you even read? No? Didn't think so.
@@Icutmetal I swear, I'm not sure why but I'm always amazed when someone is shown definitive proof but they still refuse to believe. Amazing.
With so many local ordinances forbidding the use of compression style retarder systems, a quieter version of the Jake Brake is a welcome improvement.
+riblets1968 If you see any "No Jake Brake" signs, let us know where they are located so we can educate the town on the benefits of engine braking.
+JacobsVehicleSystems I always wondered why there was a sign by my house and Now I know is because of the noise it makes
JacobsVehicleSystems that is one of the dumbest things I've ever seen, do you even know the proper use the engine brake? it's to help reduce speed on downward slopes to have less ware and tear on the brakes, there is no use or needs for them to be used in a town or a populated area unless you want to be fishing for attention
Thanks for your comment. Please find more information on our website about the noise you are hearing.
"I'm bothered by the noise of big trucks using their Engine Brakes, what can I do?
The federal government has required all vehicles manufactured since 1978 to meet noise requirements when delivered to the customer, so trucks have been required to meet the requirements when they leave the dealership as new vehicles for quite some time. The real problem here is modified or defective exhaust systems. The use of the engine brake is not the problem. Citizens and truck drivers can both do their part to keep the noise down. Citizens, encourage your local police to stop noisy vehicles and check them for muffler integrity. Truckers, if you know someone who is operating a vehicle with an excessively loud exhaust system, encourage him or her to fix it." www.jacobsvehiclesystems.com/about-us/environmental-health-safety/noise-concerns/
I live next to a railroad track in a small town. Yes, freight trains are required to blow their horns in the middle of the night too. We'll get trains coming through at all hours of the day or night and they're always required to blow their horns. It's a safety issue.
But what about our new flat world? Will this still work?
Tommy Schulte LMAO!
A flat world has no hills hence no need.
You'll slow down with your Jake Brake so you don't go over the edge into space
If the world was flat cats would push everything off the edge!
Love that sound, live half mi from i10 willcox az (77 year old retired industral mechanic)😊😊
When using the jake - it gives one a sense of awesome power ⚡︎
I say we should have a brake muffler SWITCH. In the cities and suburbs, flip it on but out and about let it roar.
When have you ever seen a Jake that wasn't on a switch?
He's talking about the noise. Have a Jake with a switch to operate the jake and another for the noise when it is on.
They're been adding that to muscle/pony cars forever, it'd be just as good an idea for a Jake brake. I'd be surprised if it hasn't been done (aftermarket)
Exhaust cutouts, still in use and still sound great.
@@Synthwave89 no such thing. Turn them off in residential areas. They are NOT necessary. They are and always will be a secondary helper brake. There is NO reason to HAVE to use it except in emergency and even then its going to be driver error...damn dude, people don't even know how to stab brake...watch them big trucks smoking brakes on a downhill...its not that they are heavy ...they are just going too fast and end up riding brakes=brake fade. Yes, weight is a factor. But the guy behind the wheel should know if his/her brakes are good...people don't even do PTIs anymore...not thorough ones. Ran an 88 Mack Superliner, NYC to landfills in PA, constantly 82,500 (used allowable percentage years back) 5 sometimes 6 days a week. Over the mountains in PA with NO ENGINE BRAKE. NONE. Most people don't know that trucks used to NOT even have steer axle brakes!
Love going down through the gears with the Jake break
What did you say ?
Can anyone explain why you wouldn’t just go into neutral? If the energy isn’t being given back to the engine with the expansion cycle, why even use the fuel? I mean I guess the engine is gonna be running regardless but
I loved you’re world view map at the end of the video, with over 700,000 trucks in the +4500kg range, you chose to omit Australia.Neglectful but completely understood. In fact, what I was surprised about, was that you’re World View map included ANY land mass other than North America!
They didnt include North America, Canada has also been excluded! 🇨🇦
from the map in the clip, one might infer that 'jake brakes' are not sold or installed in trucks intended for use/sale in Canada - but almost every commercial truck I've ever driven had a Jake brake; who's giving bad information here?
Ahhh it introduces pumping losses with the intake valve(s)!! Genius! It makes so much sense, and it's so simple. Thank you so much, I always wondered this.
Exhaust valves
It brakes the piston on vacuum in 3rd phase because the 2nd phase "compression" is modified to absent compression. My question to Jacobs Vehicle Systems is does this vacuum Jake engine breaking system is the same effective as on older compression Jake engine breaking system or the benefit is only removing the noise but is not strong as old compression Jake engine brake?
As I understand it, they didn’t redesign anything to reduce the noise. The noise reduction happens because of the addition of emissions equipmnt to the exhaust system. It’s acting as a muffler and Jacobs is using that as a selling point.
@@ronaldscott781 exactly! The new emissions systems have many more components the exhaust has to pass through before exiting the exhaust pipe than the old muffler systems.
The sound is the best part
I don’t like loud noises but I have been loving the sound of Jake brakes on the occasion I hear them. Had to look them up and see why only some semi’s use them
i love the sound dont take that away
Many people seem puzzled by fuel situation. In braking mode, no fuel is delivered because the driver's foot is off the accelerator pedal and engine rpm is above idle.
Many people also seem puzzled by how braking is achieved. The clearest statement I've ever seen is from a service manual that said "the Jake brake achieves braking by using the engine as a power consuming air pump."
Consider what would happen in a running diesel engine if something held the exhaust valves open a very small amount. An engine that has no clearance for fully open exhaust valves could accomodate having them open .025. It used to be called compression release in the days of outside rail 220 Cummins and starting aid system.
Think about what happens if the valves are held open like that. Compression stroke drives air through the small opening of the part open valve, makes a partial stroke of high-pressure air which is dumped into the exhaust manifold as it's compressed. High pressure air pulse makes a sharp bark, and it takes a significant amount of energy to compress the air.
Larger displacement engines should brake better, turboed engines likewise. Also explains the mediocre Jake on a Jimmy powered truck. Jimmies are smaller displacement for their horsepower, and their valve train doesn't lend itself as well to braking.
Since the exhaust valves only cool during their dwell on the seat, extended engine braking gets the exhaust valves extremely hot. Brakes that brake stronger get the valves hotter. The gases in the cylinder during braking are very oxygen rich, since no combustion is happening. Very hot metal plus lots of oxygen is worse than heat alone.
Even though they can create problems, the Jake is still one of the best inventions in the history of ever.
You explained it well!
And now, from the department of things absolutely NO ONE ASKED FOR:
"And with new emissions technology, the sound of the jake brake operating is all but eliminated"
I live in NYC and sometime the sound of a JB will wake me up from a sleep but I love that sound!
Too bad the video never tells us HOW a jake brake mechanism works...that is, how exactly does it keep the exhaust valve open. Could not bother with that detail.
What are service brakes? Are those what we normally call "brakes"?
Yes, service brakes are what the segment of population unfamiliar with proper vehicle nomenclature calls simply "brakes". The Jake Brake works by actuating the exhaust valve rather than the fuel injector. So... the intake air is compressed and then dumped slightly before TDC.
Thanks for always making me here that sound when I travel to mexico.
I’ve got a jakey brakey heart.
I loled!
This also is explaining why you will see increase in boost pressure and egt will not drop as fast while using jake brake. Air cannot enter the engine as much, creating a airflow restriction making your boost gauge read up a bit, and egts will not drop as much or as quick due to heat energy being generated and not just allowing air to flow through if you have the brake off and no throttle applied. If you wait, you can actually watch your egt climb back up a little bit when you hit the jake brake.
Thank you! Great video! I've always wondered how the Jake Brake works..
Glad you enjoyed it!
Hi Sandy,
Yes, you are correct. There is an error in the animation.
A Jacob brake in the UK was basically a clamp around the trailer pin and was designed to prevent a jack knife on mainly tankers.
That was the most noninformative video ever on Jake Brakes!!
+1
How boring life would be without Bam! Bam! Bam! Bam! at 2am in the morning.
Quieter Jake brake nnnnnoooooo! CAT C15 with straight pipes,jake brake ooooohh yeeaahh baby.
Ever driven a straight pipe N-14? 🤤
@@MistaRoyanT fellas fellas I can only get so erect
keeturbo straight pipe detroit diesel serie 60 jake brake 😍👌
@@MistaRoyanT I've driven a Detroit Series 60 with a burned out muffler and it sounded amazing. Truck was worthless and gutless but my engine brake never let me down.
there is many things that bring a smile to my face, but nothing does like the sound of a jake brake roaring through a straight piped c15. ear to ear.
The Jake Break is the most awesome sound, a disel can make. 👍👍
I disagree. The best sound a Diesel truck can make is cruising on an open highway, where the driver is making money and work is being done.
@@kenmore01 your right, I guess he does. Until he comes to a 5 car pile up. Then he can eather join them or stop.
It's a Brake, dude, not a Break, FFS.
Oh well 😆
I love the sound of the Jake brake. When i see signs saying no engine brake, i turn it on!
It's either jake from jacobs! Or jake from statefarm! We leave it up to u !😂
What is the mechanism? I understand you guys probably cant say due to trade secrets/ proprietary technology, but is it some type of high pressure check valve?
thanks information Jacob's engineering system
I had a compression release on my 1970's Yamaha DT250. Does that count? It worked like a Jake brake.
If i had my way they would be fitted to every onroad diesel engine, petrol to if it was possible...would be a great addition to 4wds when they are towing
Jacobson braking system is great! life saver!
If you can't depend on your service brakes to save your life, you need better brakes. If mechanical brakes can stop an 80,000 ton train, stopping a 40-ton truck should be no problem.
The sound is the best part. Don't make them quiet
That’s cause your so far up your self you have to fart through your ears. Dogs breath.
When driving a car dose it use more fuel if using gears to slow you down?
So is fuel still injected during the compression stroke when the brake is on and the compression is sent out the exhaust valve? I would think it would be more economical to not inject fuel during the compression stroke since it would just be a waste.
No fuel is injected...
If your foot is depressing the fuel pedal any little bit, the jacobs brake will not engage.
Same for the clutch.
No, no modern diesel or gas motor injects fuel when on the brake and no foot is on the gas pedal.
@@1320fastback to a certain extent, you are correct, but not all the time. Certain conditions have to be met. You are referencing DFCO, which, depending on the vehicle tuning, requires certain speeds, rpms, and loads.
DFCO works best when the timing is set to near 0, but you get no engine braking this way. Most manufacturers set DFCO timing to allow for a progressive engine braking curve, but this makes the system work less efficiently. Personally, I tune mine to limit engine braking to maximize the time DFCO is activated, except on towing vehicles, which I set for maximum braking.
Also, modern automatic transmissions unlock the TCC at 0 throttle, thereby drastically reducing the braking effect during DFCO. This can NOT be changed by programming in most modern vehicles, so you are stuck with a shitty DFCO system that doesn't save much on gas.
So in order to make your engine last as long as possible it is best to use the jake brakes the least amount needed?
Well this is about the most UN informative video I've watched in quite a while!
It’s over your head. Stick with your tricycle.
The one aspect omitted in this video when explaining the four-cycle process: Nowhere was it told when the fuel was injected into the combustion chamber; as the narration told of air intake and compression, but no mention of the fuel combining with the air to make the combustion.
In a diesel, the high compression ratio causes the air to become super hot, so when the fuel in injected, it instantly combusts - diesels don't have a carburetor.
Fuel is only injected while producing power. No fuel is injected during coasting or engine braking, so no combustion occurs then. Since fuel is not part of the engine braking process, it is not shown in the animation. The _power cycle_ that occurs while fuel is being consumed becomes the _expansion cycle_ in the absence of fuel. Most of the energy used for compression is returned during the expansion cycle, so not much retarding happens during coasting. Opening the exhaust valve at the end of the compression cycle dumps that energy into the exhaust system before it can be returned during the expansion cycle. That immediate dumping of the compressed air is why the engine holds back more during engine braking than it does just coasting. It has everything to do with pumping air and nothing to do with fuel.
I used to drive a freightliner classic with the loudest jakes I ever heard. Man I miss that truck
60 series Detroit 12.7 in our E-One Cyclone engine, 8" straight dumping out the passenger side, you get that truck loaded up 3 times (jake, throttle, jake, throttle, jake) on the 2-4-6 set on 6, then hit the throttle 1 more time, Cannon shot city complete with fireball
Ever since I was a short shit riding with my Daddy all across this great country, I've loved the rumble of a Jake Brake!
So do I pay extra for the noise?
How often do they need relined?
over the road trucks might need brakes 200000 miles to 300 000 miles city trucks 120000 miles it depends a lot on the operator how hard they drive ect
why the piston didnot hit the exhaust valve
There's just enough clearance between the valve and the piston that they don't hit each other. They can come very very close, but never touch.
The difference between an interference and non-interference engine...
The cylinder needs fuel to make the explosion to push the piston but if your runing on air let me know where I can get a truck
I thought Jake Brakes were to scare drivers and make them hate truckers. Live and learn.
My 5.0 F-150, has engine braking, very little is said about it in the owners manual. Is it a Jake Brake?
Awwww but I love the sound of the Jake Brake!
but what changes the cam timing????what makes the valve opened early????
Every diesel engine should use this system. Are they used in public vehicles, like transit buses, or school buses? I would think it'd save on wear and tear on the service brakes.
+Jason Carpp what about in diesel cars that aren't hybrids
+jjovereats I would think that *all* vehicles should be offered with such a system. Anything that helps control the downhill momentum of the vehicle.
Jason Carpp
Like a Regen brake (as seen in Priuses)
+jjovereats I'm afraid I've never owned or driven a Toyota Prius, so I don't know what it's called or how it works.
They are used in transit buses and some school buses and so on. But there are different types of retarders !
Like engine brake , exhaust brake, jake brake
Does this put pressure on the valves train? I'd rather service brakes than engine.
Braaaaaaa Brup Brup Brup Brup.... A sound that will be lost to history. The modern mandated emissions systems almost completely muffle it. I have mixed feelings about it. I love hearing it on the road but I'm not a fan of it when trying to sleep.
Is the non-combusted air mixture contained after it gets let out of the chamber? If it goes straight to the exhaust, wouldn't that be a waste of fuel? Or is there no fuel in the air that is put into the cylinder to begin with, when the Jake brake is applied?
When the jake is working the throttle is at idle. There is only a small amount of fuel going into the cylinders. That fuel is still being burned by the heat from compressing the air. It isn't just pushing fuel out of the exhaust.
On a modern diesel, the fuel is injected direct into the cylinder. When the Jake is actuated, the injector is cut off.
Most modern trucks have 'dry idle' on the over-run...ie no fuel is injected when the truck is driving the engine rather than the engine driving the truck!
come on I love the noise of jake brakes
Repeatedly at 2am? Where do you live?
I’ll come outside your house and uses mine all night that should make you happy.
The Actros uses the volf system as well
The sound of a engine brake on stage 3 is a warning to people I am slowing down, never understood why they wanted to eliminate that. My jakes are not as loud as a Hurd of fat guys on their Harley’s screaming though town !!
How is braking torque calculated?
Wow there engine uses no diesel. Love it
Uhhh yea they do in real life
@@cableheadcrew3880 No shit??
@@cableheadcrew3880 r/woooosh
A quiet jake brake....no thanks!! That sound is beautiful
People who like the sound of Jake Brakes are probably there same ones that like the sound of unmuffled Harley's. "Sounds great to us; to hell with that the immediate countryside thinks."
Ed Zachary!
I miss the old 2002 Freightliner I drove with the twin stacks and Jake Brake that really barked! Never got a ticket rolling down the I 35 hill into Duluth with it just roaring!
I miss the old style jake because they WORKED my Cummins ISX jake dosnt do anything while my old ISM would damn near throw me through the windshield
The Cummins ISX 15 has significantly greater engine braking power (250+hp greater) than the ISM, mainly due to the size difference and haul application. Which ISX configuration do you have and are you comparing the same loads?
JacobsVehicleSystems it's literally the same load and trailer it doesn't slow me down at all
Could you send us a private message with your contact info? We'd like to help solve the issue.
JacobsVehicleSystems mroozing@gmail.com email
Thank you. I will have one of our engineers contact you.
Why is Canada not on the map?
Like all engineers you messed up, there meant to be loud! It's how slow drivers know to get the F@'k moving went we come up on them doing 40 in a 70.
Blame the noise police, not the engineers, we love our inventions, to hear, see and smell them