At 11.42 2011.11.25, you wrote:
>
>
>Peter Johansson wrote:
>
>>  The trick, I imagine, would be building a
>> carburetor for a more efficient engine.
>>
>
>The current engine controllers have efficient carburation. They use
>fuel injection with a model of the relationship between time of the
>incoming air and its location during detonation.

What does have detonation to do with normal combustion? When detonation
occurs, the ignition time is retarded and/or the A/F ratio is made less
lean. When detonation is not detected, it doesn't enter into the equation
of the injection (or of the ignition) at all.


>The fuel metering is adjusted every 2-4 microseconds to get uniform mixing=
..

What? 2-4 microseconds means 30000000-15000000 RPM, while the A/F ratio
is adjusted at best every revolution of the engine (2 on 4 strokes).

There are injectors that spray more than one time per revolution cycle, but
nothing comparable to 2-4 uS. Remember they are solenoid valves.

It doesn't make sense neither that the ECU recalculates anything every 2-4u=
S,
as it would be pointless anyway. Or you mean a time resolution of 2-4uS? We=
ll,
that is pretty normal, they are microcontrollers with multi MHz range clock=
s.


>There is a reason my SUV gets better gas mileage than my motorcycle.

Yes, and it's probably not this!

Cheers,
Mario

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