i was watching an animation for a 4 stroak engine and noticed that the injectors spray fuel while the intake valve is closed... actually the timing of the spray was almost identical to the spark time... is that correct??
i am under the impression that the injector sprays fuel as the intake valve is beeing opened, this way the fuel gets distributed on the intake charge... or this is what i was told.
in the animation i could see the fuel sitting still in the intake mani and then the piston sucks the air in with the fuel... not sure if this is the best fuel mixing technique or not but that was the way in the animated video.
is their any particular reason for that timing - during the spark - or is it just a spray while the intake valve is closed... also why should the spray be at the closed valve? isn't the "spray in the intake charge" better as far as even air/fuel mixture is concerned?
need advice to fully understand how this works.
MMamdouh
injector spray timing
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injector spray timing
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Re: injector spray timing
MMamdouh wrote:i was watching an animation for a 4 stroak engine and noticed that the injectors spray fuel while the intake valve is closed... actually the timing of the spray was almost identical to the spark time... is that correct??
i am under the impression that the injector sprays fuel as the intake valve is beeing opened, this way the fuel gets distributed on the intake charge... or this is what i was told.
in the animation i could see the fuel sitting still in the intake mani and then the piston sucks the air in with the fuel... not sure if this is the best fuel mixing technique or not but that was the way in the animated video.
is their any particular reason for that timing - during the spark - or is it just a spray while the intake valve is closed... also why should the spray be at the closed valve? isn't the "spray in the intake charge" better as far as even air/fuel mixture is concerned?
need advice to fully understand how this works.
MMamdouh
I think the animation might be wrong. To my understanding it should spray during the intake stroke as the air is getting sucked in. Can you post the link?
Maybe a path. At 3000rpm the intake stroke time (half a turn) is in theory 10 millisecond. This could be too fast for our low pressure fuel injection system to spray the correct amount of fuel. So the fuel is sprayed early and the mix is ready to be sucked. And it came even worst at higher rpm when the engine need more fuel.
Read this article http://www.babcox.com/editorial/cm/cm59726.htm to see the evolution. Our Daewoo's are half way between carburetor and direct fuel injection.
And mine is even before mid point with a semi-sequential EFI: injectors are fired in pair 1-4 & 2-3
.
Sorry not answering better.
Daniel
Read this article http://www.babcox.com/editorial/cm/cm59726.htm to see the evolution. Our Daewoo's are half way between carburetor and direct fuel injection.
And mine is even before mid point with a semi-sequential EFI: injectors are fired in pair 1-4 & 2-3
.Sorry not answering better.
Daniel
exist3nce: will post a link to the vid when i get back home.
Daniel: sounds logical to me.
MMamdouh
Daniel: sounds logical to me.
MMamdouh
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Check out my ride: http://www.cardomain.com/ride/567267
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That sounds about right
some earlier gm 2.0's were TBI - throttle body injected, much like an 84 corvette
a carbeurator style TB ontop of the intake plenum with a single large injector ontop of the TB spraying fuel onto the butterfly of the TB. the 84 vette had dual TB's with injectors on them.
The theory is the same,.. spraying on a closed valve and when it opens the air mixes and sucks it in.
Slightly better but still 'old technology'
gm's new turbo 2.4 ecotec is usinig a direct injected fuel system, where the injectors are injecting directly into the cylinders.
some earlier gm 2.0's were TBI - throttle body injected, much like an 84 corvette
a carbeurator style TB ontop of the intake plenum with a single large injector ontop of the TB spraying fuel onto the butterfly of the TB. the 84 vette had dual TB's with injectors on them.
The theory is the same,.. spraying on a closed valve and when it opens the air mixes and sucks it in.
Slightly better but still 'old technology'
gm's new turbo 2.4 ecotec is usinig a direct injected fuel system, where the injectors are injecting directly into the cylinders.
Driving is the utmost fun you can have with your pants on!
Check out my ride: http://www.cardomain.com/ride/567267
Check out my ride: http://www.cardomain.com/ride/567267
heres some good reading
http://auto.howstuffworks.com/fuel-injection3.htm
http://auto.howstuffworks.com/fuel-injection5.htm
http://auto.howstuffworks.com/fuel-injection3.htm
http://auto.howstuffworks.com/fuel-injection5.htm