U-Haul rental trucks in the US used to use exhaust restriction as a speed limiter. I know this because a rental truck I was driving blew the pipe off under the cab when I was driving on the highway. I was doing the limited 63mph when I head a loud bang, back of the truck bounced as it ran over the part of the exhaust that fell off, got very loud and the truck suddenly started to accelerate. It hit 80mph before I lifted my foot. I pulled over and crawled under to see what had happened and found it had dropped a 4 foot section of pipe off. After making sure there were no wires, fuel lines or anything else that could get burned, I got back on the road and finished my drive. I was amazed at how much better the truck ran overall.
The bad ol' days before ECUs and electronic limiters. Same thing with school buses. Used to see them with the squashed tail pipes, and yet they'd be bitching about fuel costs and diesel emissions. Well duhhh...
@@mysock351C Honestly I wouldn't be surprised if U-Haul still used exhaust restriction as a speed limiter. They are not the ones paying for the fuel after all.
Honestly I reckon they still do, I rented a U-haul van recently and even tho it had the V10 it was slow as all hell, even unloaded, and it was the strangest sounding V10 I've ever heard.
Did you see the video where they put a ball valve on the exhaust to try and explode a muffler? There was some pretty high pressure, i'm guessing around 4 or 5 bar just from the sound and how that thick heavy muffler deformed.
@@iuse9646 it has to be fairly severe to cause the engine to struggle to rev in all fairness. Usually it'll throw DPF restriction codes if it sees around 4PSI pressure differential across the DPF and fails to do a regen due to insufficient EGTs. If a static regen or the right driving conditions aren't met to do a mobile regen it will just worsen until you can barely get it to rev.
The difference between 3mm and 4.5mm might not seem like much, however the volume that can pass through is more than double, so it's actually quite a significant step up.
When I was a kid, me and one of my friends clogged his dads tail pipe on purpose, just being destructive brats i guess. I remember that it stayed clogged for days until he noticed flies were gathering around the tail pipe (we used many potatos... and it was hot summer days, with the heat of the exhause system, it was rotten pretty quick) turns out the car did not notice to much because there were exhaust leaks throughout the system, which he then found out about XD
Once used an apple to plug the pipe on a friends car to confirm a leaking exhaust manifold gasket. Started the car after replacement forgetting the apple in there. Shot the apple across the street after about 10 seconds!
Was this at all inspired by the movie _Beverly Hills Cop?_ 🤣 If not, the main character shoved a bunch of bandanas in the tailpipe of the cops that were observing him, allowing him to ditch them. 😊
Thank goodness there's a translated version, this is one of the best automotive channels I've ever seen. Good combo of funny moments, good engineering, and answering random but very interesting questions 😊
Dyno time!! Please! Pretty please! Lol It would be interesting to see what the first couple restrictions did to hp being he mentioned something about feeling a little improvement.
There is something very similar to that called a jake brake. They use them in semi trucks to keep the brakes from overheating. Exhaust brake wouldn't work because when you let off the gas it stops injecting fuel at least in an EFI engine. Jake brakes work by opening the exhaust during compression and basically turning the engine into an air compressor.
@@matthewmorgan582 I'm aware of those and I wanted to create similar thing. And I think it Jake brakes actually work by not opening exhaust valves till much later in the exhaust portion of piston movement. Hence the cool sound. It would also work on Lada as fuel injected or not it still pushehs some air through the engine. It's even proven to work during the video when a very small hole is on and Wlad let's off he says himself that he can feel strong engine braking.
beamng is the closest right now with constant updates every few months, some people have gotten crazy things running in there, like a theoretical 100k rpm engine through mods, but it doesnt have the customisation level of modifying the exhaust diameter yet for instance
The amount of blowby would be the data you want. Intake is still going to see around the same amount of vacuum, at least at idle. Fuel curve really isn't going to do much in a carb, since it's velocity fed anyway
@@throttleblipsntwistedgrips1992 Not true. The more backpressure, the richer it will run. Same reason when you go to a free flowing can on a bike you have to go larger on the jets (opposite situation).
Great vid! 25mm exhaust pipes were used on heaps of small 4 and still 3 pot cars today. The pipe restriction would have more of a impact on performance if the engine was a larger capacity. Regards, Jas. VK4FJGS Rocky Qld.
I had a 3.0L Cressida with twin 1" straight pipes from header back. I thought they were 1.5" until I measured it because it looked smaller than I thought.
I'm surprised these little cars used such large diameter exhaust in the first place. Here in the US, if there were cars that small, they'd probably use about one inch pipe (25 mil.) I beleive a Slant Six Valiant uses inch and a half pipe, which is about 37 mil. I wonder if there's a big difference between a restriction in the end of the pipe versus the whole pipe being one continuous diameter. It'd be interesting to see how one of these would run if you blocked off the exhaust manifold and tapped it for a piece of fuel line.
@@BillCut how about gatling gun exhaust but dual individual headers lol. 16 exhausts all going different directions for like a burnout car. So everyone gets the same sound no matter what
As someone who has measured exhaust back pressure to diagnose bad cat converters in my fleet, I feel the engine starts to change quite a bit after 5 psi, although a seriously clogged converter will spike 20-30 psi on throttle jabs. The vehicle basically runs as if the fuel filter is clogged or the fuel pump (injected) is dying.
last year my catalytic converter failed on my pontiac with a 3800v6, it had turned sideways, and when it did that I recall that the pressure backed up so much that it sounded like and old steam locomotive and would not go faster than 20-25mph and would not rev very high. the explanation from the mechanic was that the pressure was trying to escape from the engine seals itself because the exhaust pipe was blocked so badly.
Yeah, valve float/limiter. It's cheaper to use weak springs than to fit a computer. xD lmao Also it's hard to over rev a snap a rod when the valves slap the pistons at around 5500rpm.
All carburated engines without timing modules dont have limiters, Lada engines are actually ohc and unlike pushrod old conception american "vee eit modor" engines ladas can rev easily well over 7500 without experiencing valvole float, let alone doing damage😂, with harder springs they can go 9k
Kinda, but it seems that the engine is very old too, keeping it from revving more. I mean, 6000 rpm is the limit, but the valves can probably go another 100 rpm's.
Now we know we can install a ball bearing valve for engine braking along with a ~5mm hole to bypass the valve. This would be very useful for downhill ;)
This is how we made our expansion exhausts in the mid-eighties. Empty a standard exhaust, and then always mount a plate with a smaller hole on the end.In this way we could experimentally make a somewhat better (faster acceleration) exhaust than the original. They were also often better than the cheap expansion exhausts. This was for mopeds with a cylinder capacity of 50-70 cc.
4 stroke engines do not need back-pressure. They need exhaust scavenging and velocity which is achieved through tuned resonance. Choking down the outlet changing the tuned frequency of the engine and it was obvious that the full exhaust is too big for the little engine. This is an effective method to lower HP and the red line for teenage drivers!
20-30 restriction while decreasing volume increases velocity which may actually improve exhaust ability, while below 20 increases velocity but not enough to compensate for restricted volume.
Back pressure can sometimes help with torque on small engines. Old 400cc Yamaha motorcycle engines are a good example, they have a moving valve at the exhaust
Call it the earth saver car emissions device. Sell it for 20 bucks to everyone in California and get millions in govt grants for being green. Profits!!🎉
I love the way the Lada looks I would love to get one here in the United States. Of course I'd have to drop in some kind of a badass engine nothing too crazy but at least something that's quick
in Finland you can drive a motorcycle when ur 15 and they are limited to 50 kmh, and the limitor uses this method, and it very easy to remove so teens make it go 90kmh very easily
I would really love to know what the temperature is doing of the engine does the temperature of the engine change? Does it overheat? Does it run hot cold or cooler I mean are you would think with that all the brake pressure it would run hotter, so I’m wondering if you’re forcing the engine to overheat while you drive and how far can you drive on that thing with that little tiny hole in the engine or in the exhaust I mean
for breaking divert an adjustable amount (not 107%) of exhaust to an air compressor tank then blast the gasses back into the intake manifold as a compressed gas supercharger after the pedal is past half way for acceleration booste.
My recommendation is, put a floor stopper behind the gas pedal, it will ensure you get the same results everytime. Basically put a stopper half way on the pedal, so each test you can floor it without worrying how much gas your giving it. Each test will yield a different result knowing you had the gas pedal in the same exact position as all the tests.
When I was a kid me and another kid stuffed a tatter up the school bus tail pipe and waited in the bushes to see what would happen. After the driver got it started it built up enough pressure to blow the tatter out with quite a wallop. Then we ran off before the driver could catch us. Things I did as a kid. Cheers from eastern TN
@@gordonthomson7533 Actually, given that the exhaust pipe probably has multiple leaks, I think the variable that has the most importance and impact on the engine's behavior is likely the internal pressure. That being said, I'm not a specialist, these are just suppositions :)
Weld a bung at the end of the exhaust so you can put and air pressure gauge near the end on top of the tail pipe and see how much back pressure you get with each smaller hole you screw in the tail pipe
Is there a way to put a compressor gage in the exhaust pipe to see what the compression is in the tail pipe verses the engine cylinder? Where is the balance of pressure that stalls out the latum
After you welded the threaded piece on, you should have just used a series of reducers. I think this would result in less back pressure that you get from a flat piece of metal with a hole in it.
Seems you need to have dyno (dynamometer) on your garage; the 30 mm hole seems to give best result. If only motorcyclists could see this video. Here in Finland, there are a lot of motorcycles that make noise so loud that the blood literally flows from the ears when driving past them.
Larger hole and louder (less noise dampening) makes more power... within reason, If the engine is set up properly. If their 30mm made the best power, thats because something is not optimal with the engine to begin with. However, with that said, you can shrink the hole and reduce the noise quite a lot from a "straight pipe" without losing much power. The reasons many motorcyclists use loud exhaust isnt primarily because of more power, but because they like making the noise...
You are probably right that it pulled harder with some exhaust restriction. You'd get that one some of the "malaise era" 1980s cars in the US; they had a restrictive to very restrictive exhaust (reducing horsepower, they did it to increase MPG... you can't burn a ton of gas if you're engine is all choked off...). But the exhaust restriction INCREASES low end torque. My 1985 Chevy Celebrity (with a 2.5L 4 cylinder... this was essentially a 302 V8 cut in half at the V and some balance shafts and junk stuck on), for instance, made about 85 HP but 130 foot pounds of torque (.. hold on I'll convert to metric...well, 1PS is almost 1HP, so like 87PS probably; and 175nm torque.) It probably had an extremely mild cam as well but also had a rather restrictive intake and exhaust.
@Alf if you watch dyno videos I don't know how it works but you see big upgrades in horsepower with a short downpipe, you lose horsepower with a long exhaust but somehow can gain torque
Hi garage 54! Can you please try to capture exhaust gases in a bottle? The car may stall when the pressure inside the bottle is the most the exhaust can push. Then maybe a carrousel being activated right before this pressure is reached could be triggered to start filling another bottle, etc. Would love to see that! And to see the range the car achieves per bottle filled, actually! Like this, you have a ZEV for the duration/distance permitted by the bottles in the trunk! What do you think? Thanks for your recreational vids!
Exhaust restrictions are pretty common on 2-strokes. Either the port or spark arrester plugs up. They'll start but as soon as you go to rev they fall flat on their face.
I'd like this experiment re-tested, i'm curious on how the back pressure effects fuel efficiency. Is it possible to use exhaust restriction to save on Fuel?
U-Haul rental trucks in the US used to use exhaust restriction as a speed limiter. I know this because a rental truck I was driving blew the pipe off under the cab when I was driving on the highway. I was doing the limited 63mph when I head a loud bang, back of the truck bounced as it ran over the part of the exhaust that fell off, got very loud and the truck suddenly started to accelerate. It hit 80mph before I lifted my foot. I pulled over and crawled under to see what had happened and found it had dropped a 4 foot section of pipe off. After making sure there were no wires, fuel lines or anything else that could get burned, I got back on the road and finished my drive. I was amazed at how much better the truck ran overall.
Terrible on fuel economy with exhaust restriction
The bad ol' days before ECUs and electronic limiters. Same thing with school buses. Used to see them with the squashed tail pipes, and yet they'd be bitching about fuel costs and diesel emissions. Well duhhh...
@@mysock351C Honestly I wouldn't be surprised if U-Haul still used exhaust restriction as a speed limiter. They are not the ones paying for the fuel after all.
Back in the old days, we used to put blocks of wood under the accelerator pedals so people could only put their foot 1/2 way down for the same effect.
Honestly I reckon they still do, I rented a U-haul van recently and even tho it had the V10 it was slow as all hell, even unloaded, and it was the strangest sounding V10 I've ever heard.
this is a car's equivalent of getting constipation.
😂😂
lol so true 😂😂🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣
I heard a big thunderclap after reading this.
It's more like covid
I wonder how much muffler back threw the air filter
this man acts out all my intrusive thoughts as a mechanic i love it😭
Same!
Shower thoughts
This is what being a scientist is all about.
It's a shame a pressure gauge wasn't measuring the exact back pressure for each of these. I'd be interested. Great video though. :)
I bet 1 bar lol
@@gabrielv.4358more i think easy 5 bar
Or the velocity of the exhaust coming out, I'll bet it was really moving at about 10mm
Did you see the video where they put a ball valve on the exhaust to try and explode a muffler?
There was some pretty high pressure, i'm guessing around 4 or 5 bar just from the sound and how that thick heavy muffler deformed.
Was going to suggest this myself...
that 10mm one is basically like driving a diesel car with a clogged DPF.
Fun times.
Maybe even better depending on the condition
Was thinking it ran like a diesel too, just by having the throttle open all the time
@@iuse9646 it has to be fairly severe to cause the engine to struggle to rev in all fairness. Usually it'll throw DPF restriction codes if it sees around 4PSI pressure differential across the DPF and fails to do a regen due to insufficient EGTs. If a static regen or the right driving conditions aren't met to do a mobile regen it will just worsen until you can barely get it to rev.
One thing to remember that the difference between 10 to 15 is much less than 15 to 20
As soon as the dpf throws issues, just delete it hahahaha
The difference between 3mm and 4.5mm might not seem like much, however the volume that can pass through is more than double, so it's actually quite a significant step up.
cool story bro
pi r squared
2.25 as much, to be exact
@@mann_idonotreadreplies That's maths.
@@DjClarky78 imagine mathing
When I was a kid, me and one of my friends clogged his dads tail pipe on purpose, just being destructive brats i guess. I remember that it stayed clogged for days until he noticed flies were gathering around the tail pipe (we used many potatos... and it was hot summer days, with the heat of the exhause system, it was rotten pretty quick) turns out the car did not notice to much because there were exhaust leaks throughout the system, which he then found out about XD
Once used an apple to plug the pipe on a friends car to confirm a leaking exhaust manifold gasket. Started the car after replacement forgetting the apple in there. Shot the apple across the street after about 10 seconds!
I used to own and old Lada. I always smelled exhaust gases inside so open window was a must. Interestingly though it always passed the inspection :D
😂😂😂
Was this at all inspired by the movie _Beverly Hills Cop?_ 🤣
If not, the main character shoved a bunch of bandanas in the tailpipe of the cops that were observing him, allowing him to ditch them. 😊
@@eklhaft4531that's dangerous, but ladas have that amazing charm to them :)
How many headbolts can you remove before the engine loses all compression.
Two is usually enough
Northstar V8 entered the chat
@@johnbelwell2461 😆😆
Damn genius ! Just hope the head doesn't fly in your face
How fast can you change the oil with the engine running before it blows up?
I think an economy test would be interesting with these exhaust tips!
Thank goodness there's a translated version, this is one of the best automotive channels I've ever seen. Good combo of funny moments, good engineering, and answering random but very interesting questions 😊
Dyno time!! Please! Pretty please! Lol
It would be interesting to see what the first couple restrictions did to hp being he mentioned something about feeling a little improvement.
Reversion
I've got an idea. How a bout making a valve in the exhaust that would close when brakes are applied to make it an exhaust brake?
Oooo thats an interesting idea
Brilliant
There is something very similar to that called a jake brake. They use them in semi trucks to keep the brakes from overheating. Exhaust brake wouldn't work because when you let off the gas it stops injecting fuel at least in an EFI engine. Jake brakes work by opening the exhaust during compression and basically turning the engine into an air compressor.
@@matthewmorgan582 I'm aware of those and I wanted to create similar thing. And I think it Jake brakes actually work by not opening exhaust valves till much later in the exhaust portion of piston movement. Hence the cool sound. It would also work on Lada as fuel injected or not it still pushehs some air through the engine.
It's even proven to work during the video when a very small hole is on and Wlad let's off he says himself that he can feel strong engine braking.
@@matthewmorgan582 You can even see him lunge forward lol
Imagine someone makes a game where you can customize your car in all the ways that these guys have
There's a game called automation, check it out
@@yz934 I play it, but the level of customization isn't and never will be anywhere close to what these Slavs can do.
BeamNG is also pretty cool, been playing it for years
beamng is the closest right now with constant updates every few months, some people have gotten crazy things running in there, like a theoretical 100k rpm engine through mods, but it doesnt have the customisation level of modifying the exhaust diameter yet for instance
The garage drinking in Detroit is the game you want it's expensive for good safety but lmk if u have the $
Since that's a carburator engine, it would be interesting to observe the mixture with a wideband oxygen sensor.
The amount of blowby would be the data you want. Intake is still going to see around the same amount of vacuum, at least at idle. Fuel curve really isn't going to do much in a carb, since it's velocity fed anyway
@@throttleblipsntwistedgrips1992 Not true. The more backpressure, the richer it will run. Same reason when you go to a free flowing can on a bike you have to go larger on the jets (opposite situation).
@@CarsandCats ha Mercedes has four cats yes two by two and 16 spark plugs yep on a V8 those Germans still sticking it to us
@@boknow5506 It's a Mercedes. Dual spark plugs burn more efficiently. It's all for emissions.
@@matthewmorgan582 emissions ha so if I pay for more cats and the weight and more fuel how is it saving emissions
I'm surprised they didn't lose the 10mm one 😂
needs more likes
it would be interesting to see the powerband graph on each hole diameter
I think you'd see the power band shift to a lower rpm.
Great vid!
25mm exhaust pipes were used on heaps of small 4 and still 3 pot cars today.
The pipe restriction would have more of a impact on performance if the engine was a larger capacity.
Regards, Jas.
VK4FJGS
Rocky Qld.
I had a 3.0L Cressida with twin 1" straight pipes from header back. I thought they were 1.5" until I measured it because it looked smaller than I thought.
very cool car
I’d imagine it had good grunt but fell on its face above 4500
@@afroman5531 felt about the same as stock just very loud
I theorize that if you increase backpressure and increase performance, then the car was running too lean before modification.
Normally I wouldn't watch non english speaking youtubers, but this guy has quality content. Keep it up Garage 54!
Same! I also like the translator's voice :)
Every youtuber ever: "Today, I'm putting a MASSIVE exhaust on my project car..."
Garage 54: "ˢᵐᵃˡˡᵉʳ"
Thank you for this episode, I have always thought of this as a kid but have never seen it done, very entertaining keep up the good work.
I'm surprised these little cars used such large diameter exhaust in the first place. Here in the US, if there were cars that small, they'd probably use about one inch pipe (25 mil.) I beleive a Slant Six Valiant uses inch and a half pipe, which is about 37 mil. I wonder if there's a big difference between a restriction in the end of the pipe versus the whole pipe being one continuous diameter. It'd be interesting to see how one of these would run if you blocked off the exhaust manifold and tapped it for a piece of fuel line.
Now i really wanna make a set of 8 separate 5 mm exhaust headers for a v8. But full length so u get an army of extremely angry bees out back
I was thinking similar. But more like 20mm pipes
@@BillCut how about gatling gun exhaust but dual individual headers lol. 16 exhausts all going different directions for like a burnout car. So everyone gets the same sound no matter what
As someone who has measured exhaust back pressure to diagnose bad cat converters in my fleet, I feel the engine starts to change quite a bit after 5 psi, although a seriously clogged converter will spike 20-30 psi on throttle jabs. The vehicle basically runs as if the fuel filter is clogged or the fuel pump (injected) is dying.
You guys test the most amazing and bizarre concepts. I love it!
Seriously. These guys just do anything.
Guys like this keep the Russian military going. Just think of all the blown up tanks that are being put back together.
Same concept Bmw give me with 320d & Dpf.
Garage54 answering all those what if questions we have. Great vid
last year my catalytic converter failed on my pontiac with a 3800v6, it had turned sideways, and when it did that I recall that the pressure backed up so much that it sounded like and old steam locomotive and would not go faster than 20-25mph and would not rev very high. the explanation from the mechanic was that the pressure was trying to escape from the engine seals itself because the exhaust pipe was blocked so badly.
"Is the diameter of that orifice sufficient?"
A question as old as time.
Such a valuable channel on questions that are never answered re vehicle mechanics
The limiter on a Lada, is that when the valve springs can't keep up anymore? 😁
Yeah, valve float/limiter. It's cheaper to use weak springs than to fit a computer. xD lmao Also it's hard to over rev a snap a rod when the valves slap the pistons at around 5500rpm.
All carburated engines without timing modules dont have limiters, Lada engines are actually ohc and unlike pushrod old conception american "vee eit modor" engines ladas can rev easily well over 7500 without experiencing valvole float, let alone doing damage😂, with harder springs they can go 9k
Kinda, but it seems that the engine is very old too, keeping it from revving more. I mean, 6000 rpm is the limit, but the valves can probably go another 100 rpm's.
Now we know we can install a ball bearing valve for engine braking along with a ~5mm hole to bypass the valve.
This would be very useful for downhill ;)
Those are the real questions we need answers for! Great job!
Garage54 really needs a dyno. Seeing the numbers during these tests will be just PHENOMENAL.
This guy never run out of ideas 😂
This is how we made our expansion exhausts in the mid-eighties. Empty a standard exhaust, and then always mount a plate with a smaller hole on the end.In this way we could experimentally make a somewhat better (faster acceleration) exhaust than the original. They were also often better than the cheap expansion exhausts. This was for mopeds with a cylinder capacity of 50-70 cc.
How was fuel economy difference?
Worse or better?
4 stroke engines do not need back-pressure. They need exhaust scavenging and velocity which is achieved through tuned resonance. Choking down the outlet changing the tuned frequency of the engine and it was obvious that the full exhaust is too big for the little engine. This is an effective method to lower HP and the red line for teenage drivers!
Let's see what the sawzall says about that
Great video guys!
Run the exhaust into the carburetor!
You mean make an EGR?
They already did in a video a while ago
It's not a pro changer, or a turbo, not even a supercharger, what do you call it?
@@jwalster9412 exhaust gas recirculation, many cars on the road have it today
@@jacksonledford6874 wouldn't also add some small level of boost to the intake?
20-30 restriction while decreasing volume increases velocity which may actually improve exhaust ability, while below 20 increases velocity but not enough to compensate for restricted volume.
I would have liked to see a drive pressure gauge in the exhaust to see how high it got.
Must have been tuned lean. That would explain why the 25 and 30mm made it feel more responsive
Try a balloon on the 4 or 5 mm and see how fast it blows them up. Great video guys.
THAT'S "F"n funny!!!!
I used to do that to my brothers car and he always thought it was backfiring till one day he finally seen the balloon on the tailpipe
@@jameshedrick605 absolutely hilarious. Cheers!
Would love to have seen a pressure gauge off the side of the tailpipe
Back pressure can sometimes help with torque on small engines. Old 400cc Yamaha motorcycle engines are a good example, they have a moving valve at the exhaust
pretty sure my sr400 doesn't
@@TheJunky228 FZR400, 600 and 1000 have if I remember well. Even the R6 and R1, it’s called EXUP
If I had to wager a guess, I'd say the (30) smaller diameter exhaust improved velocity and helped with scavenging.
Should have installed a 1 Bar pressure gauge to see back pressure with each size. And a crankcase pressure gauge because blowby has to be way higher.
Prob 100psi or so, prob 6 or 7 bar
yep
Call it the earth saver car emissions device. Sell it for 20 bucks to everyone in California and get millions in govt grants for being green. Profits!!🎉
What about 6 mufflers for a shot at the world's most quiet combustion vehicle?
At 5mm you've created a Jake-Brake. LOL!! That might be an idea for a video. Create an exhaust brake for a Lada. :)
no, an exhaust brake. Jake-Brake is decompression at TDC of compression stroke.
I gotta wonder how individual 7mm holes on 4 separate pipes would sound. (that adds up to about the same as a 28mm hole)
I love the way the Lada looks I would love to get one here in the United States.
Of course I'd have to drop in some kind of a badass engine nothing too crazy but at least something that's quick
Chevy 350 swap lol. Cheap and way more power than needed for a lada
lada's are awful lmao. interesting but, awful.
Great way to test your manifold gasket! :D
also good way to blow out a perfectly good manifold gasket.
Never runs out of Idea 😂
Crazy how this old race barrel stil got a close exhaust system. No leaks at all.. respect to the old car being so good and solid.
Diesel engines use exhaust brakes.
So I wonder if you could fit a flap into the exhaust and see if there is usable back pressure braking as well.
If ur thinking big semi trucks then NO!
@@mann_idonotreadreplies …I was thinking about fitting it to a Lada.
in Finland you can drive a motorcycle when ur 15 and they are limited to 50 kmh, and the limitor uses this method, and it very easy to remove so teens make it go 90kmh very easily
have to admit this is fun as always never a dull minute , wonder what could happen if u stuff a potato in the pipe ? love to see that kudos guys.
I would like to see how to smaller holes changes the cars feul consumption. Will it be better or worse? 😊
wors of course.
Exaust cap diameter is not equivalent to exaust pipe diameter. A pipe of 10 will have a lot more fluid resistence than just an end cap of 10 .
Same principle as an exhaust brake on a truck. if you added a gate valve you could use it to slow down.
I would really love to know what the temperature is doing of the engine does the temperature of the engine change? Does it overheat? Does it run hot cold or cooler I mean are you would think with that all the brake pressure it would run hotter, so I’m wondering if you’re forcing the engine to overheat while you drive and how far can you drive on that thing with that little tiny hole in the engine or in the exhaust I mean
I love garage 54s channel I like the car vids😊🎉
maybe cars could have a valve especially designed for engine braking, you would save brake pads
Gasoline engines don’t need anything more than the throttle body.
on certain buses/semi trucks, that actually exists
@@theplayer12312 Pacbrake
I love how they look like there having so much fun! 🔥
You should attach a pressure gauge on the exhaust to see what pressure the car is dealing with
Fun fact: finnish regulated 50cc bikes have chokes in the exhaust to prevent it from going more than 30mph
Just change the exhaust to a free flow one or cut off the choke
@@ardwivedi16 that would make it illegal here
Now put a ball valve on the exhaust and see if you can use it as a brake to stop the car
Time to build a variable exhaust restrictor that can be controlled from the cabin and test it as a manual engine brake while towing.
for breaking divert an adjustable amount (not 107%) of exhaust to an air compressor tank then blast the gasses back into the intake manifold as a compressed gas supercharger after the pedal is past half way for acceleration booste.
They should try a diy compression brake.... Just a ball valve on the exhaust, haha😂
Good channel, a lot of cool videos. 😊
My recommendation is, put a floor stopper behind the gas pedal, it will ensure you get the same results everytime.
Basically put a stopper half way on the pedal, so each test you can floor it without worrying how much gas your giving it.
Each test will yield a different result knowing you had the gas pedal in the same exact position as all the tests.
Yea but he basically runs full throttle now so,
When I was a kid me and another kid stuffed a tatter up the school bus tail pipe and waited in the bushes to see what would happen. After the driver got it started it built up enough pressure to blow the tatter out with quite a wallop. Then we ran off before the driver could catch us. Things I did as a kid. Cheers from eastern TN
eastern TN huh? I'm near Newport. pretty cool.
Great way to add a speed limiter.... :P
One day Garage54 gonna be the first one to make flying cars lol
They could have used a ball valve.
Hard to calibrate for comparison. This is chartable...if they'd actually measured any output result 😂
@@gordonthomson7533 Actually, given that the exhaust pipe probably has multiple leaks, I think the variable that has the most importance and impact on the engine's behavior is likely the internal pressure. That being said, I'm not a specialist, these are just suppositions :)
Weld a bung at the end of the exhaust so you can put and air pressure gauge near the end on top of the tail pipe and see how much back pressure you get with each smaller hole you screw in the tail pipe
Yes slightly restricting the exhaust builds more pressure and can actually give you a performance increase, especially if your car has VVT-I..
That's the biggest misconception some idiots believe. No "back pressure" is good. At all.
You could tap a pressure sensor on the capped exhaust pipe and find its maximum pressure before it stalls.
I wonder what diameter is equivalent to a dpf in a diesel engine
Someone in the comments mentioned that It's 10mm.
Glad to see you're still making videos, hope everything's okay for you with everything happening in the world at the moment
that's probably making some kind of crude EGR, that's actually impressive
This channel is just amazing.
The holes started at “Ready to settle down” and ended at “Trying to find myself”
imagine make engine where thtottle is on exhaust side xd
That would be interesting
The trottle body would melt, lol. But if it was at the tailpipes end maybe it could work
@@gabrielv.4358 egr, wastegate, exhaust throttle-it work perfectly fine on most of current engines, i dont know even one case when it melt
Thanks for solving my problem!! I was trying to figure this out for so long and I just couldn't do it with my Tesla.
Pull the car with a chain in gear and see if it will explode the muffler, destroy the engine, or slide the tires 😮. Ty love your videos.
It's hard enough to pull start them with a functional exhaust so they're gonna have to weigh it down a lot
Is there a way to put a compressor gage in the exhaust pipe to see what the compression is in the tail pipe verses the engine cylinder?
Where is the balance of pressure that stalls out the latum
After you welded the threaded piece on, you should have just used a series of reducers. I think this would result in less back pressure that you get from a flat piece of metal with a hole in it.
That was actually surprising I did not figure it would run at all once the hole got to like 10.
Seems you need to have dyno (dynamometer) on your garage; the 30 mm hole seems to give best result. If only motorcyclists could see this video. Here in Finland, there are a lot of motorcycles that make noise so loud that the blood literally flows from the ears when driving past them.
? As in the percussion actually causes damage to the ears ?
Surely that’d be or will be coming illegal.
Larger hole and louder (less noise dampening) makes more power... within reason, If the engine is set up properly. If their 30mm made the best power, thats because something is not optimal with the engine to begin with.
However, with that said, you can shrink the hole and reduce the noise quite a lot from a "straight pipe" without losing much power. The reasons many motorcyclists use loud exhaust isnt primarily because of more power, but because they like making the noise...
You are probably right that it pulled harder with some exhaust restriction. You'd get that one some of the "malaise era" 1980s cars in the US; they had a restrictive to very restrictive exhaust (reducing horsepower, they did it to increase MPG... you can't burn a ton of gas if you're engine is all choked off...). But the exhaust restriction INCREASES low end torque. My 1985 Chevy Celebrity (with a 2.5L 4 cylinder... this was essentially a 302 V8 cut in half at the V and some balance shafts and junk stuck on), for instance, made about 85 HP but 130 foot pounds of torque (.. hold on I'll convert to metric...well, 1PS is almost 1HP, so like 87PS probably; and 175nm torque.) It probably had an extremely mild cam as well but also had a rather restrictive intake and exhaust.
It's possible that restricting the pipe a little could give you more torque
how does that work?
@Alf if you watch dyno videos I don't know how it works but you see big upgrades in horsepower with a short downpipe, you lose horsepower with a long exhaust but somehow can gain torque
@@alf3071 Steve Morris has a video that explains it a little
back pressure giving torque is a myth
Backpressure=bad. Many guys, far smarter than me have proven it with data to back it up.
This man is the man who made all my dreams come true.
Hi garage 54! Can you please try to capture exhaust gases in a bottle? The car may stall when the pressure inside the bottle is the most the exhaust can push. Then maybe a carrousel being activated right before this pressure is reached could be triggered to start filling another bottle, etc. Would love to see that! And to see the range the car achieves per bottle filled, actually!
Like this, you have a ZEV for the duration/distance permitted by the bottles in the trunk! What do you think?
Thanks for your recreational vids!
Exhaust restrictions are pretty common on 2-strokes. Either the port or spark arrester plugs up. They'll start but as soon as you go to rev they fall flat on their face.
i wonder if it would be possible to do the same thing on the intake side too
It's called a throttle bro
Yeah, that's what a throttle body is.
Idle is like a 1 or 2 mil hole, and you go up from there.
What do you think a throttle body does?
@@volvo09 they can try it on a diesel
I was expecting a explosion from the exhaust system 😅😅
Run the exhaust back to the intake and see how long it'll run.
They already ran a car on exhaust gas
8:03 he looks like The Main Boss in that freaking jacket hahah
I'd like this experiment re-tested, i'm curious on how the back pressure effects fuel efficiency. Is it possible to use exhaust restriction to save on Fuel?
Intake side.
Back pressure blows seals.
Just drive slower and accell in the peak torque range of the engine for max efficiency.