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

Carburetors vs Electronic Fuel Injection - What's Best For Your Engine?
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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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[EBuff]

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

[fasteddie]

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

[SharikhKhan]

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

[teopolitis]

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

Lada Niva laughs in the background

[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!

[MasterKeyMagic]

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

[gowthamogowtham]

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!

[Devilacme]

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

[danebeck]

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.

[davidscott]

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.

[michaelskinner]

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.

[jacksonmehlape]

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

[jeffer]

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

[DeadlyGhostrider]

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

[davidmorales]

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.

[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.

[Aspicientis]

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

[cmecau]

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.

[masterofdisaster]

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