How Fuel Injection Works - Direct vs Port Injectors
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- čas přidán 30. 06. 2024
- How does fuel injection work? Everything you need to know about fuel injection! Throttle body injection, multipoint port injection, and direct injection. Injection techniques for both gasoline and diesel engines are explained. Enjoy!
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Should do an updated version of this video!
This guy and his channel is the treasure trove of information I have been looking for. Great videos.
Watch my "Gas Pedal - Explained" video. Also, start at the beginning of my "Acceleration and Sensors" playlist on my channel page, and watch those videos. These will more than cover the throttle body. :)
I'm pretty sure this is the channel that I learned how ABS works from a few years ago. Subbed, I owe it.
+Tapport Thanks for the sub!
HID-LED-XENON nope. There are oil rings on the pistons that act as seals between the fuel and oil. No oil gets into the cylinder, just on the sides, and walls
crazy that youre still making vids now. shows how much you love engineering and cars. hope to see you making more vids in the future!
9 years ago but still your old videos are more informative than anything else i could find on yt. Thanks.
Dang Jason, you've covered all my questions, even the ones not often asked. Thank you for your content!
I don't know how many of your videos I've watched, but every time I'm wondering something, I know you will have covered it well. Your channel is remarkable and you have a gift explaining complex engineering concepts to everybody. Kudos!
+sephiros9883 Glad you enjoy the content, thanks for watching and happy new year!
I'm in 8th grade and we just learned about simple engines with carborators in science class when my teacher pointed out that most newer engines use fuel injection. It sounded realt hard to learn but this is really straightforward. I absolutely love cars and learning everything about them. Seriously great video
Regular maintenance can go a long way, you are right there for sure. My 99' Integra only has 115k miles on it but if I didn't check the oil regularly (it burns a good amount) it would have probably died not too long ago. That said, all the electric motors still work, A/C has never given out, so that's been nice.
Thanks, glad you could learn!
I won't say all as there may still be one or two out there that still are not, but the vast majority are, yes. Small engines (lawnmowers, go-karts) still often use carburetors. NASCAR used carburetors up until 2012/2013.
1. There are far more variables involved than fuel injection delivery method. I'm currently working on a playlist of increasing horsepower, hopefully this will answer the question of "what variables?" as I develop the playlist.
2. Yes, e85 has a high octane rating (105 or so), allowing for high pressures and temps. Direct injection further allows greater compression and higher temps you can inject fuel just before igniting the fuel.
Awesome dude, thank you for providing a simple, easily understood, concise video. subbed.
Kubi Thanks!
Yes, I will have videos on this in the coming weeks!
Not sure what your question is. The answer is either 1 valve is for exhaust, or there are 2 inlet valves, and two exhaust valves, each of which are used for maximum airflow.
@NicksCorvetteMan Hey, the vette wasn't too far behind. They first started using throttle body fuel injection in '57. (Though of course direct is superior).
Absolutely, thanks for watching!
I started with your newer videos on driving manual and your tips for driving manual. Now I have found your old videos. They are very helpful. Thank you!
I live in the NW, originally from the east coast. I'd like to get into engine building eventually!
@ThePustr117 If it's port injection, then the fuel will inject directly before the intake valve opens (electronically controlled). If it's direct, the fuel will inject in one or multiple stages, during intake, sometimes during compression, and sometimes during the beginning of the combustion phase. The proper amount of fuel is released based on how much air the ECU sees coming into the engine (there will be an air sensor for the ECU) to keep a fairly constant air/fuel ratio.
dude I was doing uni assignment and your vids answer most of the general questions... just amazing, would recommend to all kids in MECH
The difference in your videos from now to before is amazing. Been watching from your first videos man. Keep it up you're awesome.
I love your videos. I'm just starting and trying to learn more and your videos click so well with me and are explained soooo well. Thank you!!!
Clear diagrams and easy to follow commentary, obviously the result of much preparation. Well done.
Thanks!
Great vid on the difference and evolution of fuel injection, love your vids, its always an enlightening and teaching experience coming from you!
I'm 12 and I've seen all of your vids and I am helping my friends father build his Supra.
You're an awesome 12 year old. When I was 12 I was useless.
Thanks... can I hav a shout out vid? And can you explain the McLaren P1?
Ps this is my moms account. A.Louise Jones isn't my name.
That the real way to learn. Getting under the bonnet.
Who else here chef at wendys making 570k a year ? /success/
With F1 the fuel is injected directly into each individual throttle body (each cylinder has it's own) which feeds directly to the intake valve.
Yep, it is indeed!
The spark will usually be somewhere in the center, and the injection can be off to the side a bit.
Likely that they spray when the valve is open, there would be no need when the valve is closed. Also, with direct injection it is obviously sprayed only when necessary.
You need intake valves to get air into the cylinder. The spark plug is likely up in the center, with the fuel injector off to the side a bit.
Viewing spree - I like that, you a halo fan haha? Anyways, you are correct, about the fuel injectors; it's just important that the fuel gets in the cylinder before the power stroke, direct injection bypasses what a carb does. Thanks for watching!
You're welcome!
Wow, these videos are very informative! You deserve your own show!
Interesting, I haven't heard of this.
thanks keep up the good work i watch your videos every week and have learned alot i love your method of teaching
hey, a big thank you from India :)it was the simplest explanation to that topic.
Great explanation as per usualy man! I swear there's always a end up at one of your vids whenever I'm just musing about engines. XD
Haha, many thanks!
Just means the fuel injectors are timed and controlled electronically. Could be applied to the injection processes I've described in this video.
Great video. You explain things really well. You should consider teaching!
VTEC is for increasing airflow, not fuel delivery, so yes, it still holds it's value.
No, flat piston heads. At one point they had a slight curve, but I don't believe they do that anymore.
very simple explained, thank you!
Nice video :3 one question can you make a video about how a fuel injection pump works?
Awesome explanation, thank you!
Hey, please help me understand more about Multi port injection system (MPFI), it would be great!
Haha honestly I thought the same for my car, because I burn a serious amount of oil (back of my car is black, though it's paint is silver) but I still passed emissions. I guess my engine is just so small it didn't matter much.
Pretty sure he's right actually, unless you can provide some literature from VW that says otherwise. Turbocharged Direct Injection described their diesel engine line-up, but does not have "diesel" in the acronym.
Hey bud. Just wanted to say thanks for the videos. So far I have only watched around 4 of them, but they have been extremely helpful. I'm actually really into video games, and it's sort of embarrassing being around family members and friends who talk about vehicles at times and I have no idea what they are talking about. It's like they are speaking a Foreign Language. So, thank you in helping explain some of the characteristics of vehicles.
Correct.
@chris22anthony Yes.
The intake valve is for air.
Any chance of a video on Batch Injection vs Sequential Injection for Multipoint Injection setups? Great channel!
I'm an application engineer at NMHG.
Super easy to understand! Thanks :)
Wow you looked so different back then! Would be nice if u do a refresher video of this.
kickass video dude. thanks!
@sage1wt Just different names for the same thing.
Good video straight to the point
So I was wondering if you would do a follow up video now that it's been so long about the differences between older style Injectors with one hole vs ones with 4 6 and even 12 holes. I know their are gains to be had in the economy and emission department but you'd have a better way of explaining what gains and how those would be achieved. Thanks man!
Good luck!
Great video!
could you please do a throttle body explanation on newer diesel engines, i cant find anything about stoichiometry on diesels. Good videos
I read in a book and some website that rotators avoid deposits from building up because of the wiping action between the valve face and seat when the valves are opened. Just like fuel injected into valves in multi-point
Thanks, I find it very interesting to learn this and the way you present, it was great..:D
Do u have a video about how fuel injection pump works after we pressed the gas pedal??.I really like to know this before my engineering course start
Graduated from NCSU with a BS in mechanical, yes.
Not a problem!
The best part is I didn't pay to be there! Thanks for watching.
Learned me something new and thanks!
Excellent explanation, love this channel.
Can multi port injection be used with diesel?
very nicely explained
good channel man...keep it up..
Very neatly presented nd good diagrams ! short nd sweet ! (y) !
April 2020 Fake covid 19 quarantine and still watching!
My good sir, you are awesome. All of your videos are so well explained and very educational. I have learned so much valuable information tonight watching your videos.
If I may request, I am into sportbikes, and I am new to electronic fuel injection "EFI". Could you make a video on tuning EFI, I have an aftermarket exhaust, oil filter, and air filter on my bike. I know it could use some tuning.
How does it work?
Whats the best device for doing it?
How do I do it correctly?
Well, it's still going to swirl around in the cylinders, and if any isn't burned it will certainly touch the exhaust valve. But likely the gas companies just want something cool to talk about.
Thanks for the video
My drawing is basically inaccurate, I was just drawing for simplicity and should have made it more realistic. Generally, the fuel will be injected more at an angle (on the side of the cylinder head, rather than directly on top) and the spark plug will usually be directly in the center at the top.
Is that the lift trucks and parts group ?
i'm French i'm not sure what you are talking about.
I should have done the same i love everything rolling with an engine.
On your spary guided gasoline diagram I like to point out that the fuel injecter most likley won't be in the center because that's where the spark plug will be.
Actually it would be in the center. The spark plug would be next to it or at a slight angle.
Perhaps, but I've only ever heard direct used in terms of directly injecting fuel into the cylinders, rather than the intake runners.
Yes. I learn Benz's EFI schematic from a book published in 1963. And it stated about GDI too.
Can you address the issue with intake valve carbon buildup on many direct injection engines?
627horsepowers A direct fuel injection is timed to happen during the intake valve open phase of the cylinder motion. The orientation of the injectors may cause some mist of fuel to be impinged on the back end of the intake valve. When the valve closes and combustion occurs, the heat from inside the cylinder ~2000K causes the incomplete combustion of the impinged fuel causing soot to form on the back of the valve. This may be the cause of carbon deposits on the intake valve.
Any chance on making a vid explaining fuel injection more in depth? I'm guessing that the injectors spray at a variable rate according to maybe throttle position, but I've always wondered how they inject just the right amount of fuel for the amount of air that comes in. Also was curious on what happens with fuel when coasting in gear with no throttle.
Of course there are always exceptions, but for the most part all of them have direct fuel injection.
Well done 👍👍
I'm assuming your only referring to direct injection, and regarding this, fuel injectors can inject rather quickly. Time to inject typically isn't an issue, so much as time for combustion.
Thank you so much!
The amount of air coming in, just like port injection.
2017 - June - and here in AZ we have extreme heat advisories. I am looking for information on the impact of excessive heat on fuel injections systems - specifically pumps situated inside the gas tank. Thoughts suggests are welcomed. This was an extremely helpful video. Kudos to you!
Hello Jim,
With the temperatures soaring, the primary pump inside of the gas tank can handle some amount of fuel vapor pressure. These systems are designed to work under death valley temperatures. The excessive vapor that evaporates due to these hot temperatures on a summer day is captured and recirculated inside the engine. This process of fuel emissions was first brought to concern by the California Air Resources Board, and lead to the development of modern evaporative emissions control systems specifically for the hot summer days in AZ.
Thank you and Wow! In all my years on CZcams that fine Sir is the best response I have ever received to a question. Truly and thank you. This made my day. I am doing research on this motivated in part by a GMC passenger van that had its fuel pump go on the second hottest day here in Tucson, Arizona. I did spot temperature readings the following day of the ground level - catching 136 F to 138 F. Now I realize the engine is hotter than this, however, I imagined the surface road temp. acting like a nice skillet - hot to the touch. Moreover, it would not be the case that a downward cooling effect could occur given the constant upward push of the hot air. I am a layperson so I contrast this with Canada where I grew up - my Dad used to put cardboard over the radiator vent in the winter time to deliberately try and stoke the engine, even with a block heater plug in (minus 40 C). I am definitely going to look into this further because here is my theory and it is only a theory: if one saw the higher prolonged temperature and marginally increase - mainly the surface heat where cars operate - there would be a tipping point in fuel pump reliability. Now what I am thinking here is the activity before and during fuel intake and in the case of GMC, within the gas tank. I need to read up on this more, but there is an issue concerning the expansion of fuel from heat and the effect of oxygen both in the tank (and I need to check this) but also in the aeration process itself. If you don't mind, I will send you a message with my findings and the only reason why I am interested in this is because the mechanics I speak to say the same thing - hot days knock out fuel pumps. Sorry for the long message, but I really appreciate your feedback and again, I will send you a message via CZcams where I will be posting my findings and it does include peer reviewed journal articles on hot air interplay with injectors. Saludos to you Good Sir! Jim
Jim,
Good to know you are conducting an independent verification. It would be interesting to see what you find in support of your theory. The evaporative emission control systems purge vapor upto a certain level from the tank. But a failure in these may cause the pump to have larger amounts of two-phase mixture that could lead to the mechanical failure.
In terms of diagnosis of failure and reliability, attributing the cause of failure to mechanical or electrical causes of pump failure could give you some direction. I would be interested to know what route this investigation takes. Best wishes!
Hey! iv been checking out most of your videos and you are great at explaining components, my car has been having issues with the fuel regulator in the fuel line, could you explain how it works? thanks!
Could you do a segment explaining how a chip(ECU) modification works and what parts of the engine it affects?
Thank you!
very helpful.....Good job:)
You should consider doing a video specifically on mechanical fuel injection!
I was just wondering how each injector knows when to inject the fuel? I presume it has something to do with an ECU? or a timing belt? Awesome videos btw, really helpful and well made!
Yep, the ECU programming will control the timing of fuel injection.
Great video. One thing that I still haven't been able to figure out and I hope you can fill in is, what regulates/causes the fuel injectors to spray at all? and how does each of the four separately know when to spray just the right amount?
+James Whyte The PCM determines injector pulse width based on input from all of your other sensors, indicating what kind of load is on the engine.
evan ziggyzigs Thanks! any ideas on how this was done back in say the 1920s and earlier? before all high tech sensors?
It was done manually and the pulse width ran at a fixed rate; whereas now the PCM can adjust fuel trim based on sensor input
evan ziggyzigs Manually like a lever of some sort to regulate the amount of fuel heading into each cylinder?
+James Whyte They used carburetors in the old days( engine vacuum pulled in air through the carb and fuel was sucked in). In the 1950's there was mechanical fuel injection ( Mercedes Benz and Corvette) and a fuel pump delivered fuel proportional to engine speed. Later on they went to electronic control,then computer control. This is the simple and condensed answer to your question.
Haha thanks, I kinda have one here on CZcams. :)
I thought the last kind was a stratified engine ? Awesome videos anyway, really helped me.