Injection timing
Jeffrey Engel
jengel at FastLane.NET
Thu Nov 21 02:29:43 GMT 1996
Mazda Ebrahimi <kleenair at ix.netcom.com writes:
> As I understand it, it is best to inject the fuel after the intake valve
> closes, so the fuel vaporizes on the somewhat hot cylinder head
> surfaces. Is this true? Is there any advantage to injecting at other
> times during the cycle? If so, explain the reasoning.
Yes, please do. Grumpy Jenkins said in his book that 85% of the fuel
vaporization occurs in the cylinder. 'Couse he's talking race
engines versus whatever we're running (street / HiPo / semi-race /
whatever). It would be nice to know what the current state-of the
art is.
I've also heard that EFI-equipped engines are sensitive to air-speed.
With the injectors down near the ports, I'd have thought air speed
wouldn't be that important.
je
jengel at fastlane.net
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