Re: Fuel injectors: injector angle in the runner
[Re: hemienvy]
#2445664
02/03/18 03:08 PM
02/03/18 03:08 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Posts: 2,540
Milwaukee WI
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There will be minor differences even with injectors at extreme placements/ angles. Even an optimized pattern/ angle/ distance is not going to be the best for the entire operating range of the engine. If you favor great idle, get the injector as close to the intake valve as possible, and aim the injector angle at the intake valve head. Idle will have the lowest air speed and air density. This means intake air will have much less effect on the shape of the injected fuel cone out of the injector. Sort of like adjusting for wind when target shooting, or peeing out of a car on the freeway😆 As density and air speed rise, injector angle gets less critical. The air will grab any fuel and move it where it wants to. The higher the rpm and density, the further from the intake valve the injector should be. The best of both worlds is staged injection.
"use it 'till it breaks, replace as needed"
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Re: Fuel injectors: injector angle in the runner
[Re: hemienvy]
#2445688
02/03/18 04:08 PM
02/03/18 04:08 PM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
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New York
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Full atomization (fuel vapor displaces air) is less damaging on a pro engine with huge air delivery. An engine with small ports needs to retain more droplets until the valve seat.
Boffin Emeritus
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Re: Fuel injectors: injector angle in the runner
[Re: Mopar_Rich]
#2446786
02/05/18 12:52 PM
02/05/18 12:52 PM
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Joined: Jan 2003
Posts: 8,037 Tulsa OK
Bad340fish
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Posts: 8,037
Tulsa OK
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And we shouldn't overlook the effect of injector timing. This ability comes with sequential injection when you have both a Crank and Cam signal. At idle you want to inject well after the camshaft reversion pulse that pulses back into the intake runner. This primarily affects idle but it can be significant with a radical cam. This is something I have yet to really dive into. Any pointers on what the data will look like when it is right? I have heard of people doing this, even talked about it some in an EFI class I took but we didn't dive too deep into what it would look like when its right. My current combo has a lot of reversion and I am sure I could benefit from it. Currently I am using the default setting of 360* before the intake valve opening so I am sure its got some blowback.
Last edited by Bad340fish; 02/05/18 12:59 PM.
68 Barracuda Formula S 340
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Re: Fuel injectors: injector angle in the runner
[Re: hemienvy]
#2446833
02/05/18 01:55 PM
02/05/18 01:55 PM
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Joined: Jan 2003
Posts: 8,037 Tulsa OK
Bad340fish
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Tulsa OK
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Thanks rich, that sounds like a handy tool to have.
68 Barracuda Formula S 340
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