List,
I think some are getting their terminology confused. There are altitude
compensators on many of the later carburetor systems, actually air
bleeds to lean the system at altitude.(parameters: closed below and open
above 5000') Although some may be part of the carburetor, most are
usually a Baro device separate from the carburetor connected by a hose.
These are designed for street use, not really applicable to what we do.
Since carburetors work on velocity, they are somewhat flexible with
altitude changes because the atmospheric pressure changes, but there
comes a time when physical adjustments are needed. One carburetor that
may be similar in function to what is being proposed is the Ford
Variable Venturi Carb (4300) which works on the same principle as the
motorcycle carbs that Jon mentions.
Tom, Redding CA - #216 D/GCC
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