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Farmall & IHC Tractors Discussion Forum
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condensation on upper carb housing

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Kevin Brooks

06-13-2005 07:47:42




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Recently was tinkering with my M and after I fired it up and let her run a few minutes, I noticed what looked like condensation on the upper flange area around the carburetor. Anyone ever seen this before? Where's it coming from?
The heat and humidity was very high when I was observing this, could this have contributed? Never seen it before, not that I run it a lot anyway as it's not a working / farming tractor anymore.

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Kevin Brooks

06-13-2005 10:22:24




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 Re: condensation on upper carb housing in reply to Kevin Brooks, 06-13-2005 07:47:42  
Thank you all for your comments. I had a feeling it was probably humidity related but since I've spent so much time recently upgrading and cleaning the ol' gal I was hoping I didn't create a whole new set of problems.



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Bob M

06-13-2005 08:22:00




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 Re: condensation on upper carb housing in reply to Kevin Brooks, 06-13-2005 07:47:42  
Kevin - This is VERY common in hot, humid weather. It's caused by the refrigerating effect of gasoline droplets evaporating in the low pressure airstream after (above) the throttle plate. When the surrounding throttle body gets cooled to below the dew point, condensation forms.

While not a problem when the weather is hot, it can be a real problem in cooler weather! Condensation occurring on the inside of the carburetor will freeze. The resulting ice can block off carb passages causing poor running or stalling until enough heat soaks down from the hot exhaust manifold to melt the ice.

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El Toro

06-13-2005 09:53:19




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 Re: condensation on upper carb housing in reply to Bob M, 06-13-2005 08:22:00  
Hi Bob, This icing was big problem for aircraft engines when they were still using carburetors.
Hal



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old

06-13-2005 08:17:38




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 Re: condensation on upper carb housing in reply to Kevin Brooks, 06-13-2005 07:47:42  
Thats normall, carbs get cold before they get hot, its the same as iceing just that its to warm for it to ice. Nothing to worry about just the way things are.



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