What's The Best Fuel Injection? Carburetors vs Port vs Direct
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What are the differences between carburetors, port injection, and direct injection? What are the advantages and disadvantages of each? Why do some cars use both port & direct fuel injection? This video deep dives into the various popular forms of fuel injection. We'll discuss the tuning flexibility of port injection, the advantages of the cooling effects of in-cylinder direct injection, as well as how dual injectors (both port & direct) can offer the benefits of both worlds, and help keep carbon deposits off of intake valves.
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That was one of the clearest explanations that I've ever heard for how a carburetor works. Thank you very much for that!
It was a good explanation but they aren't really quite that simple because a venturi doesn't give you the right air/fuel mixture across the range of throttle openings. So they have emulsion tubes and things to hack it.
@EBuff75 - I was going to say the same thing.
If you ever want to go further down the rabbit hole, go to Uncle Tony's Garage youtube channel before anywhere else. He explains things in normal car person terms and isn't delusional about carbs either.
the diagram was terrible the fuels level is always lower than the secondary venturis outlet other wise it would just gravity feed constantly that is why the float level is a critical adjustment it is suprising because this bloke is always spot on
@@scottmcgahey9720 If it was a video about carbs exclusively or much more detailed as most carbs are quite a bit more then that I'm sure he would have been accurate and said something about that.
I always feel like I have a good understanding of how most vehicle systems work and with every one of your videos you teach me something completely new.
Happy to hear it, thanks for watching Aaron!
Fancy explaining the propulsion system on Fred Flintstone's car ? ;)
When people moved from carburettors to injectors... They literally cut down on carbs...
Now they're fueling their appetite in different ways.
Sharikh Khaan get out, you
@@EngineeringExplained Oh my god, thank you so much! I love your channel!
Why not use both carburetor multyport and direct together
Samo Srakar
1) adds unnecessary complexity
2) carbs and multipoint fuel injection both mix the air and fuel before entering the cylinders
3) the air-fuel mix would be too rich
4) it hurts your mpg
Some engines run on both multipoint and direct fuel injection, but usually in engines running so much air to be burned (usually from excessive boost like you get on a Koenigsegg Jesko), or on engines using different rpm-dependent fuel-feeding strategies: multipoint/port injection on low rpm and direct injection on high rpm
Glad you decided to make TH-cam your career. Always educating.
So kind of you, thanks! :)
@@EngineeringExplained I'm curious now what would be your career if u didn't switch to youtube
"Carburators haven't been used in any production vehicles in decades"
Lada Niva laughs in the background
Even most modern motorcycles have switched to EFI... Then there's Lada...
Only carburetor
I had to do some research, it seems that they actually made a new petrol engine (1.7i) with a singlepoint injection and 5 manual gears. Pre-1994 1.6 had indeed a carb and 4 manual gears. Still the simplicity of even modern Niva makes me want to buy it for garage mechanic hobby.
@oditeomnes My neighbor still has a 1.7i Lada Niva. Could you imagine how much does it smell on gasoline from behind? It's kinda funny and I think it has a carb
I guess he's not a motorcycle guy.
I hope one day you'll cover motorcycle engines, nobody else is doing it on youtube, and you have all the right ingredients to make good quality content and tons of views!
Missed The workshop?
There's a few on here. Watched one about a week ago on how the constant mesh transmission on a bike works. Every 4 stroke engine pretty much runs on the same principle of; suck, squeeze, bang, blow.
@MunroM84 there's a LOT of differences other than them usually being oversquare. Ducati has desmo instead of valve springs which is different. The transmissions are very different. Many of them use ITBs which are different (than most car engines). Carbs were on motorcycles way up until the 2000's. I'm not "in" to motorcycles that much, so there might even be new ones with carbs.
MotoGP used 2 stroke engines until very recently. Those are way different than 4 stroke engines in cars.
Check out Matt at The Workshop. He makes detailed videos on motorcycle engines and everything else. He's also an engineer so his explanations carry just as much, if not more, technical information.
The Workshop is an incredible channel, my only regret is not watching him more
Whats the best fuel system:
Car Enthusiast: Carburetor
Mechanic: Port Injection
Engineer: Direct Injection
I hate Direct Injection it pisses me off
Everyone: Dual Injection
@@ryadhasanahmed5443 and why?
politics: no fuel injection
@@dildoshwaggins1017 carbon build up, my dad's BMW is suffering from that right now
11:17 jump scare
How neat!
Very neat
I just finished my Mech Engineering exam on Internal Combustion Engines. Just about time for this video!
So fresh to see real components in contrast to pics from the slides!
chapter 1 ICE
My biggest complaint about college was that almost every class was all formulas and theories on the board. The best teachers brought in examples of real world applications, like when my statics professor brought in a rubber I beam that you could bend and really feel the difference in the moment of inertia depending on which way you bent it.
Are you sure that was mech eng and not history ?
We're all going electric !
I feel you bro
@@davidscott5903 That's one nice teacher. I always had difficulty understanding the inertia thing.
I would like to see a video about mechanical fuel injection, like Bosch KE-Jetronic etc.
Both my mercs have it, its pretty cool how they still work even with the electronic side of it unplugged
Me too!
Agree. I had The basic Bosch CIS system on 2 cars, but there are other mechanical systems like on early Corvetts.
i have this k jetronic on my 1993 mercedes benz 300E 2.8. . .never needs maintenance always works without adjustment. that is on the benz 104 engine.
Or the far superior system Bosch Kugelfischer Injection system.
When I was younger I was confused by the Bernoulli effect. It made sense that pushing the same volume of air through a smaller hole requires it to speed up, but I didn't understand why the pressure drops? I now understand it's because air has mass and requires a force to accelerate it. The pressure drop through a venturi creates a net force that accelerates the air. The Bernoulli effect is a consequence of Newton's laws.
I love diesels, and know tons about them, but I was wondering if there's any chance of you making a video about how diesels work to help others understand how they work. And if you wanted to go down a rabbit hole, then you could do a series of videos about how the diesel fuel injectors and pumps have changed over time.
Considering that common rail injectors work at 10x the pressure of Direct injectors in gas engines, that would be cool.
I'd like to see the older Detroit Diesel 2-stroke covered. They would give the driver a work out shifting the trans all day. Back in the day, they were not my favorite to drive. Now, I like all their noise.
try adept ape channel
David Scott, that’s one big technical issue I’ve had for quite awhile now. How do these 3 liter, 4 cylinder turbo diesels work so well, unlike the old diesel motors that had no power, made lots of racket and smoke? They must be a form of direct injection that earmark diesel motors, but I’l be damned, I can’t even find the throttle plate on these new turbo Diesel engines! Can’t find the “theory of operation” book here.
@Ohio Boy
I don't know if you even deserve a reply, but I am willing to waste a little time. I am a mechanical engineer who has rebuilt a 7.3 powerstroke along with a couple gas engines, and if you want to, you can go check out my comments on Jason's other video where he describes the Achates opposed-piston diesel, where I talk about using steam injection to clean up the emissions and eliminate the need for an EGR system and how it will increase power and efficiency both. I also did one of my senior reports in thermodynamics on this topic and my professor was impressed and said that it is a promising approach. I have noticed from replies to comments though, that very few people understand what compression ignition is and how it works and why it is so much better than spark ignition. Since Jason is great at explaining things in a way that helps others understand subjects that are new to them, and has a fan base that can potentially reach out to millions of people, I thought that it would be better for him to make the video, than for me to make the video.
Great video and a very clear explanation of the different types of injection! The stratified charge portion was quite interesting. Thanks for doing this one.
I keep coming back to this channel because its intellectually engaging! Your 'petrolheadedness' is on another level, I am keen to understanding it!
This is one of Jason's best videos yet. Impressed with how good a job he does explaining things. Bravo.
Hello EE from Canada. Thank you for uploading such great videos. Love watching them. 🙏🙏
Appreciate the kind words, thanks for watching! :)
@@EngineeringExplained You have many Canadian fans ;)
Congratulations on this video and your always interesting explanations. I would like to mention, though, a couple of important mistakes I noted:
1. Gasoline in an engine does not explode, it deflagrates, which is a controlled combustion. The only time when it explodes is when the dreaded instantaneous and uncontrolled detonation, or pinging, occurs, which engineers of course want to prevent.
2. The purpose of carburetor sprays and fuel injectors is to atomize, not vaporize, the fuel. Atomized fuel maintains a high density while being very effective in reducing the air charge temperature, increasing its density. Vaporized fuel, having a much lower density, reduces efficiency. The idea is to get all the air/fuel mixture all the way into the cylinder in this atomized state, to preserve a high density and ideal air/fuel ratio. The biggest disadvantage of carburetors-and for that matter, throttle-body injection-is not that they are imprecise per se, but that the plumbing between them and the cylinder is less than ideal: part of the mist of fuel droplets tends to separate from the air charge at the turns and nooks of the intake system and puddle on the walls, and another part tends to vaporize due to the heat they find along their path. That is one of the reasons why 1-carburetor-per-cylinder systems of the Weber DCOE type, with their mostly straight individual runners (which are also unaffected by the intake pulses of adjacent cylinders) can offer both better economy and power than a conventional single- or double-barrel carburetor on a multiple-port manifold.
So.. semantics. Lol.
Heads Mess there’s always one
important distinctions, thanks
A really good explanation for how all of these various systems work...perhaps the best I've seen so far! I do get the feeling that dual-injection is really a Rube Goldberg kind of solution for the pitfalls of direct injection though. Really wish more automakers would stick with/return to port injection for long-term engine durability.
EE- for dummies instruction not from a dummy. Best breakdown of basic fuel integration I have ever seen.
I have one of each! A 1980 Bedford van (carb) , 2005 Corolla (port injection) 2009 Golf (direct injection) 2018 86 (dual injection) . They all work! It amazes me that the 86 can run 12.6:1 compression ratio due to the wonders of direct injection (as Al from The Skid Factory explained to me). Another advantage.
Points, Carburetor & kick starter make a perfect combo.
Tool kit under the saddle and you are done, 70's Honda FTW
The vid didn't mention repair either. Should of been considered when grading "best" system. Carb and point is so much easier to maintain.
@@Incab I hate carbs and points!!!! Had a 1970 Volvo with both; was working on it forever. I always knew when it was time to file or replace the points (every couple months): the engine would get balky and the clutch would be really ragged. The throttle pivot was worn out as well, letting air in and making the idle unreliable. Much less maintenance with electronic ignition and port injection. Made it 200K miles in my last Prius without touching either one.
@@flagmichael That's just a bad car, not a bad system. Look at the cost difference between an average carb kit and rotor cap vs the injection system and computer chip on the prius. Substantial. To each their own but I would rather have a 1978 F-150 than a 2020 F-150.
I'll concede on transistor ignition. But the rest of the BS you can keep. FI: I have 12 vehicles and not one has injection. Just keep it.
Using a small pocket of rich a/f mixture next to the spark plug and running the rest of it more lean is what the Honda cvcc engines were back in like the 70s
Yes! Very cool stuff for the time, even today haha. It's a technique similar to what is used in Formula 1 as well. Mercedes engine efficiency is wild as a result: th-cam.com/video/kOhmgpkiIfg/w-d-xo.html
@@EngineeringExplained but it makes a lot of NOx emissions ... if onoy there was a way to reduce the air density for efficiency ... oh wait there is the dirty EGR to do so
Wow amazing, I had to look that up to check (Not that I didn't take your word for it🙀)...1971 Holy moly! Mr Honda himself developed it.
@@EngineeringExplained Some diesel engines use a camshaft/plunger to actuate mechanical direct injection. Seems to be to be a good system.
@@martinda7446 I'm an old fart, when he started describing it, it sounded familiar
That's a wonderful video. I can't believe how far we've come with fuel injection systems. I'm always glad nowadays engines are so freaking efficient compared to old cars. I knew there was technology behind it but I didn't know how cool that tech was until now.
A perfect and clear explanations about how fuel gets into the cylinders: my compliments
A good and thorough overview of the different fuel systems in gas cars, though I was surprised no reference was made to catalytic converters, which is essentially what mandated the switch from carburetors to electronic injectors back in the late 80s - early 90s.
Now as then, emission regulations are what have required manufacturers to come up with these complicated dual injection engines to meet emission standards at low loads while providing acceptable performance at high loads. Perhaps you could do a video just on the evolution of emission control systems and how they have shaped modern engines?
That would be interesting, although getting political is not really EE's cup of tea. I wonder what kind of designs we would have if manufacturers were free to design according to demand. Would we have a race to the bottom with lots of corner cutting or would we have even more efficient engines as more engine types were explored and engines were kept simple and pragmatic.
@@mennovanlavieren3885 Race to the bottom. Engines before emissions were massively inefficient since they could just up the cylinder size to make more power. That's why we had production cars with 8+ liter engines not even pushing 200hp. Especially moreso when you compare what the "bottom end" of back then was compared to the "bottom end" of nowadays.
We can already see what happens when a manufacture is free to design according to demand, that's why General Motors always needs a bailout. People don't actually want what made all of the old cars "great".
I second this suggestion!
It was 1986, and had nothing to do with catalytic onverters
@@mennovanlavieren3885 Focusing on the engine design its self isn't political unless one tries to debate the merits and demerits of government sanctioned environmental regulation, which I wasn't suggesting and I don't think is particularly relevant to the channel.
Port injection is my favorite for sure, it can be very reliable and the entire setup can be pretty simple. Direct just brings more problems and replaces cheap parts with expensive high pressure parts. Carb are very simple but also a complete pain in the ass, hard to tune, have to be synchronized, require maintenance. They do sound good though.
There's always people saying I love carbs because I can fix them on the side of the road, but with electric port injection you wouldn't be on the side of the road to begin with.
If you know what you're doing, a carburetor isn't difficult to tune. It's only difficult if you're uneducated and/or unskilled with carburetor tuning. Literally all you need is a screwdriver and some knowledge/experience!
Think of tuning a carburetor like tuning a guitar: There's that sweet spot you want to be in, but there's also such thing as too much and too little.
Agree, I have a Suzuki Kizashi 2013 with port injection, old technology in compare to other brands same year. Those engines and components even if old school are pretty reliable and can hit over 300k miles with normal servicing.
Haha nice one!
Fantastic videos. You talk quickly but I never lose track of what's being said or have to skip back from not understanding something. A lot of detailed information and explained in a great way 👍🏼
“HOW NEAT!” 🤣😂. Great and thorough review as always. You are truly an expert and fantastic educator.
Ah, the Rochester Quadrajet. One of the best carburetors ever manufactured.
The QUADROBOG!!!! it went well with the "Slip and Slide Powerglide"!!!
@@painkillerjones6232 Ah, if only you had the knowledge to tune it. Then you'd be able to see its hidden potential.
@@marcomacias8941 It was a favorite of mine back in the day, rebuilt more of them than I could count.
Spot on though, they copped a bad rep here because not many people could tune them properly, but set up properly they were a great all rounder.
I have 2 trucks (76, 86) registered that I drives daily, BOTH are Quadrajet equipped. They're great, reliable, and use less fuel that Edelbrock or Holley Equipped motors.
Another well done video, thank you for that! One remark: You forgot to mention the downturns of direct injection with regard to smoke and NOx emissions which makes exhaust gas aftertreatment way more complicated. Greetings from germany :)
Genau. Das ist richtig.
DI also has big problems with the inlet pipes getting carbonated thanks to exhaust gases getting re-fed into the engine. Newer/better models use multiport injection to also inject into the air inlet like in the old days.
Gotta love wee bit reek tho
Very well done, Jason. The only thing I learned was what I had thought was your misidentifying a carburetor as a fuel injector. By golly, your white board diagram of the carburetor demonstrated that in fact, a carburetor does inject fuel. Bravo!
I thought the same. In fact, I just learned that a carburetor is actually just a more advanced mechanical fuel injection system. I've seen some articles call it "carbureted fuel injection".
Best look again. The engine draws fuel in from a carb using a venturi (aka a restriction), while FI's squirt it in.
Those were 11min and 40s of direct information injection into our brains! Great job! Thanks a lot!
Damn, it's past 2 am here in NYC, glanced at the title and thought it said " What's the best fuel injection for Coronavirus"?
I need some sleep :/
That moment when you realize 2011 was 9 years ago
1/1/2020 early in the afternoon?
SCP 89 Math not your thing?
It wasnt 9 years ago... It was 3-3 and a half years ago :D Thats how I feel it... One day you graduate from school... 3 months later - a year passed by
That moment you realize 2011 model year was 10 years ago... Marketing doesn't know how numbers work.
You had me thinking that this video is from 2011. Nice.
My car engine still uses a carburator. Nice to see the explanation of how it works.
I have been waiting for this one! I knew you would do it eventually!
Getting some Bill Nye vibes. Keep it up!
„and thus make more power” is such a beautiful sentence
Top vid Jason! Thanks for the insight as always mate 💪
I have waited for this video for so long, couldn’t thank you enough
"Carburators haven't been used in any production vehicles in decades"
Aviation world and Lycoming : "mmmmmh looks like we missed a train here"
I don’t know of any new Aviation company that still uses a carburetor. 🤔
Maxime Eckstein You can still buy carbureted aviation engines, but virtually all of the new Lycoming/Continental engines sold in new aircraft use a rudimentary port injection system. The FAA is slow to adapt new technology.
Robbe Plunkett man isn’t that the truth.
@@robbeplunkett699 so true.
I worked for a small lite aircraft manufacturer and we used Lycoming and Continental engines. The injection system reminded me of the 90's poppet valve system used on GM V8 and V6 truck engines, which was eventually replaced with injectors, as EE showed the injector "spider" in the video.
The Rotax engine we offered did use a modern (for the aviation world) electronic fuel injection with injectors at every port, a MAP sensor and associated electrics.
For what Lycoming and Continental charge for an engine (last I checked it was $30K) you'd think they'd offer modern fuel injection. And yes, the FAA is WAY behind the curve.
David Gonzalez Exactly! I currently fly newer Cessna 172s and Piper Arrows and the fact that these modern aircraft (albeit old designs) still have a mixture control for the pilot to vary the AFR is ridiculous IMO. If you don’t mind me asking, what company did you work
for?
Hey EE, Could you do a comparison between motorcycle engines and car engines? maybe most powerful across the two platforms or comparing 2 inline 4's etc...?
What for ?
Amazing video man. I like the way you explained things. I was waiting for a vid involving carbs. I'm trying to rebuild mine at the moment
Amazing videos man. I am an EE graduate but learning about automotive engine from your videos is so satisfying.
It would have been great to hear about Hondas CVCC carburetor and engine
stratified charge is still used by Mazda
I know what the Honda cvcc’ are but what’s special ab the motor and carb other than being a motorcycle engine
Could you make a video explaining how mechanical fuel injection works? I’ve always been curious about the transitioning period between carburetors and EFI.
There are two systems of mechanical injection that i know of. For instance early injection engines used a injection pump that operates on the same principle as diesel inline type injection pumps. A camshaft drives individual pumping plungers for each cylinder. The effective stroke and thus the fuel quantity is controlled by variable spill port opening and closing. This type of pump can be used for both port injection and direct injection.
In the 70's Bosch came up with the K jetronic aka Continous injection system. It uses a vane type air flow meter to control a valve which varied fuel flow to injectors. More air flow - more fuel injected. Later the system evolved to KE jetronic with some electronic controlls but still mainly mechanical.
There might be more but I don't know of any
Always love your videos and look forward to watching them and always learn something new while being entertained. Great work! Thank you!
This was really great thank you. Is it possible for you to do a video where you dissect a fuel injector and explain the insides (in terms of why manufacturers choose their designs)? I did search your channel but couldn't find something like this. Again thank you, I'm an engineering student and you have consistently taught and helped me dream of making cool cars.
It should really be called an air pedal. It lets air in first, and more fuel flows as a result of more air.
So in a gasoline-powered engine, yes. In a diesel, it’s legitimately a fuel pedal.
The proper term is an accelerator pedal
@@royalriding1720 You mean throttle.
Shain Andrews only if it’s actuating a throttle body
The governmental morons started calling it a gas peddle during the fuel crisis in the 70s. It was previously called the throttle, in that it literally throttles the air.
I prefer direct injection, compression ignition and turbocharging.
Diesel for the win!
flashgordon99999 or a HCCI, Mazda engine
Do you prefer to do all the work on that?
Evil, dirty stuff. I had a Ford 6.0 EGR valve stick open 12 miles from pavement.
*Diesel Gang Rise Up*
wow! In an abstract way, this seems so insanely complicated to solve getting goods delivered and commuting to work. Excellent video, as always.
Indeed. It is the truckers and commuters that keep the world going round.
Imparting knowledge is what you do best. Thanks!!!
With 2 Years of Experience in crafting port and direct injection valves for Diesel and gasoline engine I habe fo say thats pretty Good explained
One more thing. . . By cooling the mixture and minimizing knock, the difference between cold and hot is greater, increasing the thermodynamic efficiency of the engine. . .
When it's running perfectly.
Awesome video and definitely has given me new knowledge of cars. You should do a video explaining how each of them are used in tuning!
This is the only time i fully understand the cleaning effect by the fuel injector to the valve Thanks
Now you have got to explain the Air Mass Sensor and the O2 Sensor and how those are controlled by the Pixie Machine Confuser to give an efficient burn.
The mass air sensor and the o2 sensor tell the computer what to do not the other way around
theres a great video on this topic by diagnose dan on TH-cam. check it out. the engineering of it is pretty neat
"Carburators haven't been used in any production vehicles in decades"
*Laughs in motorcylces*
Thank you for properly explaining carburetors and not just blanket crapping on them, from a fuel injection guy
The only thing I regret about finding this channel is not founding it earlier, keep up the good work!
There is something i would want to mention and something i want to ask: The 300 SL of 1955 had a mechanical direct injenction. And i would think it had no problem with carbon deposits, as i think (could be wrong) the return of exhaust gasses into the intake was done much later for emission reasons.
The question: Diesels before common rail had a little pocket inside the cylinder which contained the glow plug and the injectornozzle. Does this still count as direct injection? It is inside the cylinder, but notin the designated "burning space"...
Technically they arent direct injection even though the injector is constantly connected to the combustion chamber through a tiny hole.
@@dylanmontgomerie6069 Why not? everything i read about the cars engine said it is direct injection. It injects directly into the chamber onto the exhaust valve and the pistonhead. (for extra cooling of these parts)
@@nirfz Sorry i meant the diesels you were talking about, the 300 sl is direct injection.
Port injection ftw, the best of both worlds.
Such a well thought, concise video, so much information I feel like I have to watch it again 😵🤯 thank you!!
After a many watched videos on carbon GDI & port injection, I’m so happy to discover my 2023 Kia Sportage has duel injection systems. Great video.
A great video as usual! A carburetor will have the most cooling effect as the time that the fuel moves from the carb to the cylinder is longer due to the length of the intake port/runner. This tends to allow for slightly higher power numbers than FI on the same engine. Fuel injection gives the most control over the entire rpm/load range, but without working control systems they will not run properly or at all. Carbs are archaic but will still supply fuel after all the high tech control systems breakdown. Don’t get me wrong I like FI but I get more satisfaction working on my +80 years old car.
Lol, love how he totally glossed over throttle body injection.
Ever worked on it? I want to forget it (and the older Tauruses that used it) ever existed.
@@flagmichael yeah, crossfire fuel injection once upon a time.
Extremely informative as always! Wonderful!
Looking at the 4 bbl carb reminded me of my old Buick with a 455 and a Rochester Quadrajet. It had tiny primaries and massive secondaries. I can still remember the glorious sound when you floored it and the secondaries opened up.
The 4bbl in this video is infact a Quadrajet
You also have the mechanical fuel injection systems too like Bosch Ke or k-jet from the 80s, very complicated to work on but are actually suprisingly reliable and good at holding a tune.
They still seem to exist as fuel systems for race engines though
Archy Grey all hail the mighty K Jetronic
D’AWWWW he thinks carbs automatically account for engine modifications and exhaust flow rate! BOY do I wish that was true. Then my garage wouldn’t be full of motorcycles and cars forever out of tune. I have 13 carbs in my life and sometimes I want to stuff them all into a shredder.
Just because they react to differences in airflow doesn't mean they react the way you want them too.
Paul Hinman It’s not so bad once you learn how to tune them correctly and keep them clean. One trick I would like to share with you is once you get your carburetors tuned correctly run Marvel mystery oil in your fuel it will help keep your carburetors clean and performing at their best. 1 ounce per gallon of fuel works best. Plus it is an excellent top end lubrication. And it does wonders for the intake valve guide.
You provide such wonderful information. I've been doing this stuff all my life and I find you most informative. Many thanks!
Always good to refresh. :)
I was amused to see you having a bit of "humble mechanic 's" intonation .
How neat! I’d love to hear your thoughts on desmotronic valves on Ducati’s.
DesmoDROMIC not tronic. It's not electric or motorized. BTW, it was invented by Mercedes.
Hey Jason, better title suggestion
"What's the best fuel DELIVERY"
Since carburetors don't really count as 'injection'
Injection is high pressure on one side and low pressure on the other. carburetors are injecting the fuel.
Thank You, that is what I meant in you other video about the 1000hp street legal car. How port is better for cleaning and direct for power. I think all car companies should incorporate both. Great video.
Carburetors are by far the most fascinating work of engineering out of all fuel delivery systems. It never ceases to amaze me how much versatility and precision has been achieved just by some intricate use of holes and cavities in a metal block and utilization of pressure difference and Bernoulli’s principle. They don’t do calculations to time and quantify anything, they don’t force feed fuel, they just maintain a constant state of balance which allows them to deliver exactly what the engine demands.
Which in turn makes carburetors the snappiest of all. Nothing responds to throttle inputs as crisply as a well-tuned carb.
I absolutely disagree that you don't have much control over a carb. You can have a silly amount of control over air fuel ratio, you just have to know how to use it. The AEM UEGO I have in my 1971 Dodge Dart proves my point every time I drive it.
I still love my old quadrajet, feel free to send me the new one you have there if you're not gonna use it for anything. :)
Rebuilt a few, beware the "sinking float" on some. Solid float absorbs gas, & gets heavy.
I was once a painter and if you know how a spray gun works, you'll know that carb is a combination of a spray gun and a toilet. In a spray gun, air rushing by a nozzle draws the paint out and atomizes it. In a toilet, the water level in the tank is controlled by a valve connected to a float. When the level drops (you flush to toilet) the float drops and opens the valve whick lets more water in until the level (and thus the float) rises enough to close the valve. Spray gun + toilet = carburetor.
As an ol'skool retired engineer still tuning carbs (1958 Porsche) I have to say v.g. explanation of carb physics. Well Done!! Regarding complexity, whilst use use the term "electronic" you did not address the complexity associated with that seemingly simple term. That includes everything from crankshaft positioning sensors to the mini-computer. That might make a nice sister video. You might start with Chrysler's attempt in late 1950's to build an analog electronic FI pre-solid-state electronics. The wax insulating media within old fashioned physical capacitors would melt!!! Keep u the good work
Wow you are amazing ,I changed the way I see the things, with this inspiration I have started my own TH-cam channel "Where When and why ❤️", it is about real time applications of my strem. Thank you for everything because you have changed my life 🤗.
Incredible explanation! About as concise and well rounded as it gets.
Definitely do a video on diesel injection! From mechanical pump, electrical pump, PD engines, and up to common rail injection, that would be interesting one!
Great video! You should do one on SU style carbs sometime. I know nobody uses them any more but they were a neat design. Maybe we need an Engineering Explained Classic channel.
What forced the switch to fuel injection (which is ultimately better but at the time was more expensive and not as reliable) was catalysts as there was no mechanical equivalent to the "lambda sensor" or O2 sensor in the exhaust.
What a great explanation about this systems! Thanks!
how neat! loved this video, thank you. carburettors have always been black magic to me
Thank you for your good explanation! Let me clarify the difference between the port and direct injectors. Port one puts liquid gas into the place just before coming to the combustion room. And direct one puts gasoline directly into combustion room by high pressure.
Port pros: cleaning carbons etc., Cons: takes more time to mix with air so less effecient.
Direct Pros: Better mixture with air so more effecient. Temperature reduction by faster evaporation. Cons: no cleaning from carbons
This was very helpful for understanding the carbureted engine on the Cessna 172 that I fly. The whole Venturi thing was confusing me until I saw your video 👍🏾
Great video! I hope this educates people to not a solely direct injection vehicle unless they are aware of the additional maintenance costs. I'm going dual, or port injection only in my next car.
You are the best!! Amazing at explaining and presenting. Makes it really easy to grasp and understand. ☺️
Wow...you are very good with your videos and explaining things with clarity. I'm recently finding out about the technology in my 2020 Camry 2.5 Dynamic Force engine. That engine also has both port and direct injection. Thanks for your great videos.
Having read about port/direct all my life, it was VERY interesting ("neat" lol) to see how carbs work. Especially the four barrel. Imagine the lever of simplicity in adjusting the points on the throttle when the larger barrels open up. Very cool! 👏
There is generally no need to adjust the seccondary opening point on that style of 4bbl, I've got 2 trucks running that carb and only 1 of them have I tweaked the seccondary opening linkage on. (I didn't even "need" to, BUT I was prepping the carb to go on a 320HP engine)
Great explanation. Simple and enjoyable to watch. Thanks!
My god, this video is golden! It's so clear and understandable, thank you!
You sir, are a good example of things we need to see more of on the internet
Never knew what stratified injection meant, thanks for the explanation!
I really loe your thorough, in-depth, yet understandable explanations, and how you inject humor into all your videos (although I'm not sure if it's port-injected humor, or direct injected :P), but the more you explain how these Rube Goldberg devices work, the clearer it becomes that electric is the future. Don't get me wrong: I was proud of myself for doing most of my own repairs and figuring it out as I went along on my last car, a 95 Saturn. But now that I have an EV, I really don't miss auto maintenance at all.
Variable Venturi would be a nice extension to the carburetor topic.
Also as mentioned above, the mechanical injection systems by Bosch are quite interesting from engineering standpoint.
Maybe in a future video?
Although both VV carbs and K-jetronic are probably rare in the US
Thank you for all the helpful information keep up the great work
Very Loud and Clear😎👍 this will help a lot of people without any small idea about what kind of part it is and how it really works in our engine 🤓 excellent!