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

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

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

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

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!

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!

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

11:17 jump scare

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

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.

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

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

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.

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.

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

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.

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.

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

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 👍🏼

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.

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'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.

Always love your videos and look forward to watching them and always learn something new while being entertained. Great work! Thank you!

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 :)

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

You provide such wonderful information. I've been doing this stuff all my life and I find you most informative. Many thanks!

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

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

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

Top vid Jason! Thanks for the insight as always mate 💪

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

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...?

Getting some Bill Nye vibes. Keep it up!

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.

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!

That moment when you realize 2011 was 9 years ago

Points, Carburetor & kick starter make a perfect combo.

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

Imparting knowledge is what you do best. Thanks!!!

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.

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

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.

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.

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 :/

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

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 .

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!

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

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.

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

Wow, Amazing explanation once again. Both informative and entertaining.

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.

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"...

Like always, well explained, and no time wasted.

I have been waiting for this one! I knew you would do it eventually!

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

I prefer direct injection, compression ignition and turbocharging.

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.

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.

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

Port injection ftw, the best of both worlds.

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 👍🏾

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

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. . .

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

You are the best!! Amazing at explaining and presenting. Makes it really easy to grasp and understand. ☺️

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.

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

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

Really good video Jason. Right up there with your best. Keep it up.

Great explanation. Simple and enjoyable to watch. Thanks!

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

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.

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

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

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

I love this channel! Thanks for the clear explanation.

Incredible explanation! About as concise and well rounded as it gets.

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.

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. :)

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

Such a well thought, concise video, so much information I feel like I have to watch it again 😵🤯 thank you!!

I have waited for this video for so long, couldn’t thank you enough

Great video and explanations on all of these systems.

I enjoy a lot watching your videos, entertaining and educational. Keep them up!

Thank you for that clear and concise explanation.

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.

Another great video. Thanks for sharing. Gives me inspiration for my channel.

Another good one! Well done!

Your videos are always great, thanks.

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

“HOW NEAT!” 🤣😂. Great and thorough review as always. You are truly an expert and fantastic educator.

Thank you for all the helpful information keep up the great work

Amazingly explained thank you so much for valuable information!

What a great explanation about this systems! Thanks!

Awesome as always brother

Thanks man. I'm actually learning things.

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

Thanks for great video! All my cars are port fuel injected but my motorcycles are and will be equipped with carburetors. Most of them are 2-strokes though.