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Carb frosting on RTU

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Dave 1020

10-19-2002 13:15:46




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This summer I bought a RTU that needed rewiring and a few other little things.I put a carb kit and a new floatin.Last week I got it running and it runs good, but after it run around 10 min.the intake above the carb. starts to frost up.Can anyone tell me what is wrong.Thank You for your help.




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Bob K

10-22-2002 08:07:58




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 Re: Carb frosting on RTU in reply to Dave 1020, 10-19-2002 13:15:46  
As RL said, nothing is wrong. As the fuel vaporizes in the venturi tube above the carb, there is a significant temperature drop which causes either condensation or frost on the intake tube (depending on the outside temp). I'm guessing it's cooler where you are and the condensation is freezing.

In airplanes, carbureted engines must have a heat source to prevent the carb from freezing at higher altitudes in humid weather. If the carb freezes up, the aircraft turns into a glider so carb heat is a requirement.

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Bob K

10-22-2002 08:05:15




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 Re: Carb frosting on RTU in reply to Dave 1020, 10-19-2002 13:15:46  
As RL said, nothing is wrong. As the fuel vaporizes in the venturi tube above the carb, there is a significant temperature drop which causes either condensation or frost on the intake tube (depending on the outside temp). I'm guessing it's cooler where you are and the condensation is freezing.

In airplanes, carbureted engines must have a heat source to prevent the carb from freezing at higher altitudes in humid weather. If the carb freezes up, the aircraft turns into a glider so carb heat is a requirement.

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RL

10-19-2002 19:06:08




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 Re: Carb frosting on RTU in reply to Dave 1020, 10-19-2002 13:15:46  
Nothing is wrong.Mine does this also.



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