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

[Bruce]

From: "Jon Davis" <jfdavis at epix.net>
Subject: Re: Mass Market EFI (was: Intake manifold construction,
intercoolers)
> 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

Apples and Oranges.
   Aviation stuff is designed to be as fail safe as possible, ie simple.  I
have yet to see a DCOE (that fact has been edited out) in aviation use, and
I'd doubt that it was properly tuned to begin with.   That and the basic
principal that pilots like to be in total control.
I've also noticed a far number of aircraft that allow mixture control, but
ignore ignition.
The few aircraft carbs, that I've looked at were at best primitive,
interesting as far as being able to work inverted, but that's all.
   Just to get back to EFI:
   There are a number of EFI's that are MAP systems, that other then at
start up never reference to Baro., other then some special cases.   The
correction is only do to the exhuast back pressure change, and depending on
altitude might just be a minor issue, as you climb then it will get more
meaningful,  as far as US roads, I don't think many get over 6K'.
   Go to a high enough altitude, and it's engine design / application that
is the ruling matter.
Bruce


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