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Re: Re: Re: Re: ? for randy hall + others about co
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Posted by Guy Fay on September 10, 2003 at 19:20:44 from (169.207.193.59):
In Reply to: Re: Re: Re: ? for randy hall + others about compre posted by Steve - IN on September 10, 2003 at 18:21:06:
The engine itself was run at higher tempeture. In addition to the heat shields, which raised the tempeture probably well above what you'd see in a normally aspirated aircraft engine, radiator shutters and thermostats were used. In aircraft, the purpose of carb heating is to prevent ice from forming within the carburetor- carb heat is used mainly in conditions within a certain range of humidity and tempetures to prevent ice, and lower efficiency results, which is why you don't really use it at altitude, just when you're coming up and down in most (not all) circumstances. Damn, that aviation ground school I took all those years ago finally got put to use. Ice can litteraly choke off the carburetor (it can also happen in cars and tractors, but is rarer). The use of carb heating in a kerosene/distillate engine is only part of the story. Radiator shutters are used as well to bring the engine tempeture up quickly to promote clean, efficient burning, and to prevent crankcase oil dilution. The whole purpose is to raise the tempeture of the fuel/air misture to vaporize/evaporate the fuel, which takes place at a much higher tempeture than gasolene- believe the measurement is vapor pressure, rather than octane.
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