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In the absence of a heat source, an evaporating liquid cools its immediate surroundings. Carburetor icing becomes possible when the intake air temperature is reduced to below the freezing point of water. The air temperature is reduced both by evaporative cooling of the avgas and also expansion cooling as air passes through the carburetor venturi. Under certain conditions, especially intake air temperatures between about
–4ºC and 15ºC (25ºF and 60ºF) and high humidity, ice can form in the venturi and on the throttle plate. Icing does not occur when the air temperature is too low, below about –7ºC to –12ºC (20ºF to 10ºF), because then the air is too dry.Ice formation can interrupt carburetion, causing the engine to stall. The icing tendency of a fuel increases with increased volatility because a greater fraction of the fuel vaporizes in the carburetor rather than in the intake manifold. Some engine designs avoid the icing problem by heating the intake air or the carburetor venturi and throttle plate.
So I'm having this dream! I'm in a Turbo Z and these guys are after me, but they can't catch me, So they get a car, but they can't catch me. So they get a plane, and just as their about to catch me, the TWIN TURBOS KICK IN! |
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