Posted by Bob M on November 25, 2008 at 05:28:21 from (151.190.254.108):
In Reply to: Re: Frosty carb posted by Farmall wrangler on November 25, 2008 at 02:36:04:
You’re absolutely correct! The colder inlet air is the more dense it is. And more dense the inlet air the more power an engine will produce.
However when cold inlet air is also humid it causes ice to accumulate in the carb venturi and throttle plate area. The ice plugs carb ports and air bleeds at idle/low load. This changes carb calibration results (usually…) in an excessively rich condition which in turn causes engine stumbling, fouled plugs, etc.
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Note that all carbureted aircraft engines are equipped with a manual “carb heat” control. This is so the pilot can select heat (in exchange for slightly reduced power) when carb icing conditions exist.
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