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why not the LS2LS7? @ May 16th 2008 11:53AM
With port fuel injection, the fuel is always injected into the cylinder with the intake values open. Watch the BMW commercial to see it in action.
The only time you inject when the valves are closed is when you have a direct-injected engine, which this isn't.
Open valve technology sounds like a modified Miller cycle to me.
Bah @ May 16th 2008 12:00PM
Well, maybe that's just because Ford has been doing it wrong all these years?
havoc @ May 16th 2008 12:39PM
i agree, perhaps they looked at the old millenia and decided to use some type of miller cycle to reduce pumping losses. otherwise... unless you are DI, how are you supposed to get fuel into the cyl?
naggs @ May 16th 2008 12:48PM
unless there is a supercharger, this will not reduce pumping losses.
maybe it is referring to the placement of the injector, spraying directly at the back of the valve?
why not the LS2LS7? @ May 16th 2008 1:20PM
Port injection always sprays at the back of the valve, which is why it is critical it be open when you spray.
I guess I meant Atkinson cycle.
http://en.wikipedia.org/wiki/Atkinson_cycle
Basically, leaving the intake valve open for part of the compression stroke effectively gives you a longer power (expansion) stroke than compression stroke, which can give better efficiency. Can it lead to increased output without changing anything else inside? I dunno, the only way I can think it would is just by reducing the amount of power consumed in the engine and thus more comes out at the shaft.