Injector timing

[Tony Bryant]

On Wed, 13 Mar 2002 04:35, you wrote:
> After thinking about injector sizes and timing I came up with the following
> idea:
>
> When driving WOT at injector duties of 80-90%, you inject about 50-70% of
> the fuel on the back of the closed intake valve. Due to the heat of the
> valve, the fuel will vaporize. When the valve is opening, the first gas
> entering the engine will be almost pure fuel, the air entering the engine
> at later time contains much less fuel. So the fuel distribution is very
> uneven and the you will get less air in the cylinder due to the vaporized
> fuel.
>
> What about using big injectors and injecting only when the intake valve is
> open ? With opening times of about 230deg, you need big injectors with low
> duty cycles of 720deg/230deg, about 30% at WOT.
>
> Did anyone try if the use of such big injectors with accurate timing will
> improve power/fuel consumption ? I am aware that you will need a dual
> injector setup to get the engine idle properly.

Toyota use 440cc injectors on the 7MGTE Supra 3.0L turbo 6 which makes 240HP. 
Do the maths and you find they don't open for very long...

Don't know if there's any point, but you'd think Toyota would have their 
reasons...


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