What's The Best Fuel Injection? Carburetors vs Port vs Direct

[@EBuff75]

That was one of the clearest explanations that I've ever heard for how a carburetor works. Thank you very much for that!

[@benc8386]

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.

[@Abb0nz1]

@EBuff75 - I was going to say the same thing.

[@superdupergrover9857]

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.

[@scottmcgahey9720]

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

[@benjaminwands4663]

@@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.

[@cloverasx]

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.

[@EngineeringExplained]

Happy to hear it, thanks for watching Aaron!

[@millomweb]

Fancy explaining the propulsion system on Fred Flintstone's car ? ;)

[@fasteddie2413]

Glad you decided to make KZbin your career. Always educating.

[@EngineeringExplained]

So kind of you, thanks! :)

[@andersonng1709]

@@EngineeringExplained I'm curious now what would be your career if u didn't switch to youtube

[@eblemis]

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.

[@gowthamogowtham3029]

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!

[@Arfazmn66]

chapter 1 ICE

[@davidscott5903]

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.

[@millomweb]

Are you sure that was mech eng and not history ? We're all going electric !

[@sergio3674]

I feel you bro

[@JudyAbbott494]

@@davidscott5903 That's one nice teacher. I always had difficulty understanding the inertia thing.

[@AntonioBarba_TheKaneB]

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!

[@TheEsseboy]

Missed The workshop?

[@Ratkill9000]

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.

[@samfedorka5629]

@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.

[@DocKhan]

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.

[@erikhordnes1641]

The Workshop is an incredible channel, my only regret is not watching him more

[@SharikhKhan138]

When people moved from carburettors to injectors... They literally cut down on carbs...

[@EngineeringExplained]

Now they're fueling their appetite in different ways.

[@juliojonathan8348]

Sharikh Khaan get out, you

[@SharikhKhan138]

@@EngineeringExplained Oh my god, thank you so much! I love your channel!

[@samosrakar]

Why not use both carburetor multyport and direct together

[@juliojonathan8348]

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

[@teopolitis]

"Carburators haven't been used in any production vehicles in decades" Lada Niva laughs in the background

[@nasonguy]

Even most modern motorcycles have switched to EFI... Then there's Lada...

[@bkalinic]

Only carburetor

[@oditeomnes]

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.

[@bkalinic]

@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

[@rob21]

I guess he's not a motorcycle guy.

[@Devilacme]

I would like to see a video about mechanical fuel injection, like Bosch KE-Jetronic etc.

[@archygrey9093]

Both my mercs have it, its pretty cool how they still work even with the electronic side of it unplugged

[@davidscott5903]

Me too!

[@kevink2315]

Agree. I had The basic Bosch CIS system on 2 cars, but there are other mechanical systems like on early Corvetts.

[@davebarenberg4922]

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.

[@znoop72]

Or the far superior system Bosch Kugelfischer Injection system.

[@davidmorales2887]

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.

[@markbedross8721]

So.. semantics. Lol.

[@kyzor-sosay6087]

Heads Mess there’s always one

[@michaelhansen7516]

important distinctions, thanks

[@MasterKeyMagic]

Whats the best fuel system: Car Enthusiast: Carburetor Mechanic: Port Injection Engineer: Direct Injection

[@ryadhasanahmed5443]

I hate Direct Injection it pisses me off

[@raysears5439]

Everyone: Dual Injection

[@dildoshwaggins1017]

@@ryadhasanahmed5443 and why?

[@johannesdatblue4164]

politics: no fuel injection

[@ryadhasanahmed5443]

@@dildoshwaggins1017 carbon build up, my dad's BMW is suffering from that right now

[@davidscott5903]

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.

[@R4M_Tommy]

Considering that common rail injectors work at 10x the pressure of Direct injectors in gas engines, that would be cool.

[@stevewilson9792]

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.

[@kalebpersinger7864]

try adept ape channel

[@chrisbragdon5901]

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.

[@davidscott5903]

@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.

[@Nexlingz]

11:17 jump scare

[@dustinmorrison6315]

How neat!

[@romirsarangi4341]

Very neat

[@CrazyPetez]

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!

[@James-eg3nf]

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".

[@kevink2315]

Best look again. The engine draws fuel in from a carb using a venturi (aka a restriction), while FI's squirt it in.

[@DeadlyGhostrider]

Hello EE from Canada. Thank you for uploading such great videos. Love watching them. 🙏🙏

[@EngineeringExplained]

Appreciate the kind words, thanks for watching! :)

[@cS-nf2dg]

@@EngineeringExplained You have many Canadian fans ;)

[@robertmatetich2898]

Don't forget that injection also requires support from computer technology with associated sensors. Manufacturers tried to implement F.I. in the early 60's, but didn't have the computer technology to make it reliable under all atmospheric conditions, i.e., altitude, humidity, temperature, etc.

[@jacksonmehlape6144]

I keep coming back to this channel because its intellectually engaging! Your 'petrolheadedness' is on another level, I am keen to understanding it!

[@cme2cau]

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.

[@danebeck7900]

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.

[@soundseeker63]

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?

[@mennol3885]

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.

[@LordOfSilense]

@@mennol3885 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".

[@brenj]

I second this suggestion!

[@Mach141]

It was 1986, and had nothing to do with catalytic onverters

[@soundseeker63]

@@mennol3885 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.

[@michaelskinner896]

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.

[@johannmartinez8886]

My car engine still uses a carburator. Nice to see the explanation of how it works.

[@anandhakannan552]

Points, Carburetor & kick starter make a perfect combo.

[@tomnwoo]

Tool kit under the saddle and you are done, 70's Honda FTW

[@Incab]

The vid didn't mention repair either. Should of been considered when grading "best" system. Carb and point is so much easier to maintain.

[@flagmichael]

@@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.

[@Incab]

@@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.

[@RodFleming-World]

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.

[@mario18sebast]

The only thing I regret about finding this channel is not founding it earlier, keep up the good work!

[@masterofdisaster492]

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

[@EngineeringExplained]

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: kzbin.info/www/bejne/oYDLnpqmoM58nMk

[@ssllhh100]

@@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

[@martinda7446]

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.

[@masterofdisaster492]

@@martinda7446 I'm an old fart, when he started describing it, it sounded familiar

[@martinda7446]

@@masterofdisaster492 That makes two old farts...Open the window please love. Edit: 😸

[@Aspicientis]

Those were 11min and 40s of direct information injection into our brains! Great job! Thanks a lot!

[@chrisfreemesser]

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.

[@ccpgmike620]

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

[@postlerzogger]

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

[@justinbelk89]

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.

[@reistje]

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.

[@adelaideautowashes]

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.

[@The_Touring_Jedi]

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.

[@friendofvinnie]

Haha nice one!

[@funtohave5604]

This is the only time i fully understand the cleaning effect by the fuel injector to the valve Thanks

[@ChuckTheHamster]

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 :)

[@ronanrogers4127]

Genau. Das ist richtig.

[@whuzzzup]

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.

[@TheGreatBritishFarm]

Gotta love wee bit reek tho

[@totti79]

Back in the days there was BOSCH L-Jetronic fuel injection system, this was a mechanical fuel injection with multiple port injectors that continuously sprays fuel and an injector distributor (head) that controls fuel to the injectors using a lever and plate that is moved by the engine intake suction .

[@rickrack78]

It would have been great to hear about Hondas CVCC carburetor and engine

[@timothykeith1367]

stratified charge is still used by Mazda

[@kalemathews1899]

I know what the Honda cvcc’ are but what’s special ab the motor and carb other than being a motorcycle engine

[@jeffer168]

This is one of Jason's best videos yet. Impressed with how good a job he does explaining things. Bravo.

[@nikolafilipovic5506]

Getting some Bill Nye vibes. Keep it up!

[@mr.h5436]

wow! In an abstract way, this seems so insanely complicated to solve getting goods delivered and commuting to work. Excellent video, as always.

[@TheyWhomTheGodsDetest]

Indeed. It is the truckers and commuters that keep the world going round.

[@PumpkinDefender]

Could you make a video explaining how mechanical fuel injection works? I’ve always been curious about the transitioning period between carburetors and EFI.

[@petarmiletic997]

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

[@rickc303]

Thank you for properly explaining carburetors and not just blanket crapping on them, from a fuel injection guy

[@amirbechor3768]

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...?

[@millomweb]

What for ?

[@falconejo]

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.

[@chrisgraham9203]

Ah, the Rochester Quadrajet. One of the best carburetors ever manufactured.

[@painkillerjones6232]

The QUADROBOG!!!! it went well with the "Slip and Slide Powerglide"!!!

[@marcomacias8941]

@@painkillerjones6232 Ah, if only you had the knowledge to tune it. Then you'd be able to see its hidden potential.

[@thebaconsonful]

@@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.

[@Texassince1836]

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.

[@hooman2824]

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!

[@pierredentremont2999]

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.

[@amdviperxd98b]

EE- for dummies instruction not from a dummy. Best breakdown of basic fuel integration I have ever seen.

[@boriss.861]

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.

[@archygrey9093]

The mass air sensor and the o2 sensor tell the computer what to do not the other way around

[@lordjaashin]

theres a great video on this topic by diagnose dan on KZbin. check it out. the engineering of it is pretty neat

[@Mark-dn7jv]

My aviation background and training makes me believe the only thing you got wrong is the fuel in a carburetor is actually drawn in from the vacuum caused by the venturi. Your videos are really good, keep up the good work.

[@ChrisPBacon-wq4pu]

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 :/

[@marcob4630]

A perfect and clear explanations about how fuel gets into the cylinders: my compliments

[@PopcornSticker]

„and thus make more power” is such a beautiful sentence

[@GTRxMan]

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.

[@Texassince1836]

The 4bbl in this video is infact a Quadrajet

[@steventrott8714]

It should really be called an air pedal. It lets air in first, and more fuel flows as a result of more air.

[@aygwm]

So in a gasoline-powered engine, yes. In a diesel, it’s legitimately a fuel pedal.

[@royalriding1720]

The proper term is an accelerator pedal

[@ShainAndrews]

@@royalriding1720 You mean throttle.

[@LSX_Tony]

Shain Andrews only if it’s actuating a throttle body

[@crazytrain7114]

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.

[@darrellhay]

Funny thing you mentioned carburetors cannot control mixture, yet simple cheap low horsepower aircraft engines all the way back from in the 40's have mechanical mixture controls to compensate for altitude, and are the primary control for run and shut off---and temperature control. Only a very few of the latest gasoline aircraft engines today do not have mixture controls (even in the throttle body injected engines), and in many the industry do not implicitly trust them without a mixture control, since they are so integral.

[@nirfz]

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"...

[@dylanmontgomerie6069]

Technically they arent direct injection even though the injector is constantly connected to the combustion chamber through a tiny hole.

[@nirfz]

@@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)

[@dylanmontgomerie6069]

@@nirfz Sorry i meant the diesels you were talking about, the 300 sl is direct injection.

[@kittlebeans596]

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 👍🏼

[@dewiz9596]

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. . .

[@timjohnson1199]

When it's running perfectly.

[@andresguraieb1947]

Man you're the best teacher in the universe. Thank you for all your videos.

[@lag_profil]

I prefer direct injection, compression ignition and turbocharging.

[@flashgordon99999]

Diesel for the win!

[@martinandersson5278]

flashgordon99999 or a HCCI, Mazda engine

[@timjohnson1199]

Do you prefer to do all the work on that?

[@flagmichael]

Evil, dirty stuff. I had a Ford 6.0 EGR valve stick open 12 miles from pavement.

[@electric7487]

*Diesel Gang Rise Up*

[@midwestlegacy1919]

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 👍🏾

[@superseriousreviews1168]

Port injection ftw, the best of both worlds.

[@markguzewski5430]

I always wondered why a choke does what it does on a carburetor, as compared to the throttle. Finally, I get it. Thanks.

[@wherewhenandwhy2481]

Wow you are amazing ,I changed the way I see the things, with this inspiration I have started my own KZbin channel "Where When and why ❤️", it is about real time applications of my strem. Thank you for everything because you have changed my life 🤗.

[@davidrayner9832]

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.

[@MaximEck96]

"Carburators haven't been used in any production vehicles in decades" Aviation world and Lycoming : "mmmmmh looks like we missed a train here"

[@sweetcheels]

I don’t know of any new Aviation company that still uses a carburetor. 🤔

[@robbeplunkett699]

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.

[@sweetcheels]

Robbe Plunkett man isn’t that the truth.

[@DavidGonzalez-lu3eb]

@@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.

[@robbeplunkett699]

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?

[@nasiefhendricks5349]

You sir, are a good example of things we need to see more of on the internet

[@Bozacar]

It's not explosion. As far I know explosion means moving faster than speed of sound. But during combustion it doesn't happen, and when it does happen it causes problems.

[@jgerdinggmail]

Thanks for saying it... Despite the speed at which it occurs, it's still definitely controlled combustion, or at least meant to be. Explosions or uncontrolled simultaneous combustion just wrecks things.

[@labradormcgraw]

Christ almighty - does this guy know his stuff! It's one thing to have studied all that knowledge, but presenting it as he does, without ever having to think, requires real skill. Huge respect to Engineering Explained.

[@ArthurSperotto]

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.

[@nathankopfmann8659]

Have you checked out metering rod carbs? Like the ones from lectron or smart carb. They use really ingenious stuff. They have a specially designed rod that sticks out into the intake, and it creates an eddy current that draws fuel up the rod in different volumes and heights depending on how much air it draws past

[@archygrey9093]

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

[@curtislovrak5390]

Archy Grey all hail the mighty K Jetronic

[@benevolentbear8213]

Amazing videos man. I am an EE graduate but learning about automotive engine from your videos is so satisfying.

[@josefsvitak3967]

Cylinders are being cooled down by water around them, pistons by oil below them, but valves can only be cooled down by fuel injection - means port fuel injection - apart from mentioned cleaning effect. This just work awesome. Direct injection has no real benefits, as is clear to anybody who was driving direct fuel injection car and port fuel injection car. Furthermore Port injection has zero maintenance in at least first 500 000 km and is perfectly reliable. And lastly port injection can be used for LPG injection - with just 100% functionality and reliability, which is not the case with direct injection, where it is impossible to use LPG injection alone. To put it into some numbers: my 1.0 Liter turbo charged gasoline with direct injection takes in long term average 6 liters of natural 95 per 100 km, and older 1.6 gasoline engine with no turbo and port injection is taking 5 liters of same natural 95 for 100 km - both engines having same peak power 60 KW, cars same weight and same driver of course over same roads and conditions ...

[@rifat_yilmaz]

The engines which have both port and direct injections are sold worldwide. For example Mitsubishi uses it in Eclipse Cross. I drove it for about one year and the engine was amazing.

[@bravosierra2010]

How neat! I’d love to hear your thoughts on desmotronic valves on Ducati’s.

[@R4M_Tommy]

DesmoDROMIC not tronic. It's not electric or motorized. BTW, it was invented by Mercedes.

[@Wonka0998]

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.

[@user-ls9ff4cu9x]

That moment when you realize 2011 was 9 years ago

[@mennol3885]

1/1/2020 early in the afternoon?

[@LTVoyager]

SCP 89 Math not your thing?

[@deanjohnson7283]

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

[@alexskywalker888]

That moment you realize 2011 model year was 10 years ago... Marketing doesn't know how numbers work.

[@frankmills1917]

You had me thinking that this video is from 2011. Nice.

[@vanderleigoncalves7367]

Hi. I live in Brazil and I am average in English. so I would like to suggest that you put English subtitles on your videos. I often don't understand and I have to replay the video over and over again. Your videos are great

[@MarvelousSeven]

Lol, love how he totally glossed over throttle body injection.

[@flagmichael]

Ever worked on it? I want to forget it (and the older Tauruses that used it) ever existed.

[@MarvelousSeven]

@@flagmichael yeah, crossfire fuel injection once upon a time.

[@Guy-ky9mc]

I've built many engines on cars, motorcycles, jet skis, name it.. and several totally custom turbocharger systems with obd0 (yes) . I have much appreciation for the ability to fine tune air/fuel ratios with the ecu/EPROM chip but there's still something I just love about old motors and carburetors.. especially the two strokes. We need to get back to two strokes but perhaps without the premix.. i.e. an independent oil system to keep things clean

[@chrishernandez2490]

Hey Jason, better title suggestion "What's the best fuel DELIVERY" Since carburetors don't really count as 'injection'

[@dylanmontgomerie6069]

Injection is high pressure on one side and low pressure on the other. carburetors are injecting the fuel.

[@akoponen]

If you want both performance and economy it may be hard to beat patent pending Augmented Compression Engine (ACE) technology. This uses either a super simple carburetor (no need to vary fuel/air ratio) or fuel injection to inject the stoichiometric ratio of fuel to air, the inlet is long enough to vaporize the fuel and the throttle valve just before the combustion chamber adds enough recycled exhaust (EGR) to reduce down to the power selected. Just before the throttle the ACE also uses water injection to put in the appropriate quantity of water. This water does the triple duty of cooling the mix, making it denser allows more into the combustion chamber, cooling the combustion just enough to prevent power being wasted in combining oxygen with nitrogen producing NOx and in doing so turns to steam, expanding and providing even more power. Otherwise no changes need to be made to the average internal combustion engine, though one should no longer need a catalytic converter and ceramic coating the combustion chamber(s) and recycling water vapor from the exhaust is suggested.

[@mingusog7036]

"Carburators haven't been used in any production vehicles in decades" *Laughs in motorcylces*

[@bajakitesurfer9542]

I Love All your Vides - You have quite a gift at communicating and exude a tremendous passion for your interests. In this video I’d like to offer some small critique; I wish you had mentioned. Accelerator Pumps when discussing the Carbs, this , as you know is additional way carburetors create more power from an engine, and they are integral to most Carbs. Second, I wish you would have described the physical action inside a cylinder as a fuel ‘Burn’ , not an Explosion. Which leads me to my last point - Explosions in cylinders are bad , we call that Detonation or Pre-ignition . ‘Knock’ is just the slang term we use to describe an audible symptom of Detonation/Pre-ignition , the cars engine makes pro iced ‘knocking ‘ sounds that we hear in the cockpit.

[@bajakitesurfer9542]

Sorry for the misspellings on my last post ( autocorrect!) the last sentence should read; The cars engine makes pronounces ‘knocking’ sounds that we hear in the cockpit . These are just small observations, please take them in a positive light. I am a Huge Fan of all your videos and appreciate your enthusiasm, ability to explain complicated subjects in lay terms and your clear expertise in your subject matter and engineering and physics overall. Please keep up the good work and keep them coming !

[@PhaedruS007]

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.

[@danieljensen2626]

Just because they react to differences in airflow doesn't mean they react the way you want them too.

[@stevenlefebvre2991]

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.

[@filipstefan9384]

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!

[@tomthumb1322]

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. :)

[@kevink2315]

Rebuilt a few, beware the "sinking float" on some. Solid float absorbs gas, & gets heavy.

[@apyllyon]

to all those talking about lada:Lada Niva,Samara has been Produced still today and has both the fuel injected gasoline engine used since the 1990s as gasoline, and a diesel variant both with bosch k-jetronic fuel im and more modern fuel injection solutions.and more modern models introduced technical features from renault-mitsubishi-nissan. Niva had Power windows as option since the 1990s.although now days somewhat underpowered the older generations of the niva series were designed to be ``low maintenance`` along with 1st and 2nd gen samaras(1988-2000),samara series was much rarer as a diesel variant but existed much to my understanding,with peogeot diesel engine,along with the later years of nivas production.the 2000-2003 samaras where rife with ecu and other related problems(been there done that)

[@mattheviewer]

Helpful explaination! FYI most home generators including the large whole house models still rely on carburetors.

[@machfive916]

Excellent presentation, even for the less mechanically inclined or informed.

[@carlitosbrigante6889]

Engineering Explained great comparation , clear and detailed video ,but at 10:26 right behind you that s a NEC violation .

[@dharma4320]

Why lectures aren't like these ?... I learnt a lot thank you

[@hakansternersson1804]

Wait to 8:52 for the white board. As usual, great information for everyone motorinterested. Thumbs up!

[@cameronpack6908]

Would love to see you break down the new fancy electronic carburetor management like Holly has.

[@nmuire246]

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.

[@robertmacpeek424]

Cool to see carbs on the channel. Looked like a Monojet, then the tried & true Quadrajet. Only correction as far as the carbs go is the don't "inject" fuel at all, that's not how they work. Carburetors Emulsify fuel. The pressure differential created when a piston is no longer occupying a given area in the cylinder has atmospheric pressure pushing (14.7 lbs) down on it constantly trying to occupy the whole cylinder. Computer controlled carburetors (CCC on GM vehicles 1981-1988) were designed to help better control the A/F ratio. One of the biggest advantages of a carburetor (esp in drag racing) over F/I is the fact that carburetors COOL the incoming air change, whereas F/I really doesn't even get the time or chance to do so....plus a Holley is just plain Cool looking when you pop the hood. F/I is just convenient though for daily driver, no doubt. Looks like Advance sent you a GM Vortec 305/350 "Spider" harness lol The 96-00 Vortec trucks are Really good truck engines (pretty much alluding to what was coming up next the LS engines 😉) , & for their time the Vortec heads really flow quite well esp being a plain Jane iron truck head. Too bad they (stock) are limited on their spring install height (nothing a little machining can't fix though)

[@jeanvaljean1475]

I have a 1.4 ,75 hp port injected 17 yo Renault which works perfectly fine for me. One of the best small engines ever made in Europe. I would love to bring a v8 from the USA but where I live the vehicle tax for engines over 3000 cc are around $2000-$3000 a year and I am not rich.

[@Rei-z5l27]

Where do you live and what is your job?

[@jeanvaljean1475]

@ Romania, driver

[@brucec954]

As someone who had carbureted cars in the 1960's & 70's, I'm so thankful they went away! So you need to put a modern spin on how to deliver "fuel" to a motor. Choices to deliver electrons are Bus Bars, Solid Wire, or Stranded wire.

[@memogana]

Now I love internal combustion engines tnks to you. What a great channel!

[@iggypornete3475]

One of underrated channel.