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Re: Carb sweats...?
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Posted by Semper Fi Guy on July 05, 2007 at 05:55:40 from (4.224.222.228):
In Reply to: Carb sweats...? posted by Andy Schuppert on July 04, 2007 at 19:06:56:
Andy, Yes inside the carburetor there is a venturi, a narrowed up passage which speeds up the air as it passes towards the combustion chamber, at this smallest area a jet,( nozzle or orfice) is postioned so as to mix the fuel into the air, it atomizes, or becomes a mist...this is the best for the engine to use the fuel.Outside the carburetor this is where it sweats, even frosts up in the summer!!!! pilots of small aircraft have a control for "carburetor heat", it is a valve that takes heated air from the around the exhaust manifold jacket ( not exhaust gasses), and it eneters the carburetor air intake, by passing the air filter, this air helps melt any ice that forms inside this venturi or around the throttle butterfly valve in the carburetor... this is dangerous for airplanes because carburetor ice can make an engine reduce power or shut down, if the ice breaks away and plugs up the system and cause a forced landing, the pilot can pull this control knob to add heated air and melt any ice that he suspects, the engine rpm will drop some during this procedure due to warmer air is allready somewhat expanded and combustion is compomised a little. Hot summer days when humidty is high is the worst time for something like this to happen, but it does, I have learned many things by flying airplanes...and messing around with experimental aircraft...
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