Mass Market EFI (was: Intake manifold construction, intercoolers)

[Greg Hermann]

At 1:15 AM 12/9/01, Jon Davis wrote:
>Bruce wrote:
>
>> > Out of curiosity, Bruce, how do you tune the carbs for things like
>> > temperature, barometric pressure/altitude,
>>
>> They work on Bernolli's Principal, so do those comps as a matter of
>design.
>
>Why does an airplane have a mixture lever then? AFAIK the carbs in airplanes
>still work using a venturi, yet they require you to lean the mixture at
>altitude. As you lean, there is a noticable increase in power (until you go
>too far). This implies carbs do not compensate for atmospheric pressure
>variations.
>
>Jon Davis

You are correct, Jon, they don't. Main jet diameter needs to vary with the
fourth root of the air density ratio in order to maintain constant A/F
ratio from a carby.

Greg


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