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Allis Chalmers Discussion Forum
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carburator icing on WD

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Davey

05-23-2004 12:16:26




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Even with air temp in the 80's my carb is severely icing up on startup. Any suggestions or methods for stopping this. Thanks in advance.

Dave




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Bob Weber

05-24-2004 09:44:29




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 Re: carburator icing on WD in reply to Davey, 05-23-2004 12:16:26  
It's caused by the cooling effect of vaporizing gasoline, and is much more prevalent on very humid days. In carbureted airplanes, this is resolved by drawing in heated air from around the engine, as the inside of the carb can be iced badly enough to kill the engine. One of the "rules of thumb" of flying small airplanes is that carburetor icing is very likely to happen if the "spread" between the actual temperature and the dew point is 5 degrees or less, as you are getting real close to the point where water will start to condense out of the air. The added cooling of the air by the atomizing gasoline is very likely to exacerbate this.

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Rock_Picker

05-23-2004 20:58:16




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 Re: carburator icing on WD in reply to Davey, 05-23-2004 12:16:26  
The carb has an air in-leak somewhere. Air is expanding like the refrigerant in an air conditioning system and creating the cold carb. Check for places where air can be getting sucked into the carb. As someone else said, the throttle shaft is a good suspect. If that is not it, keep looking..... ..... .RP



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Bob H.

05-23-2004 15:35:21




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 Re: carburator icing on WD in reply to Davey, 05-23-2004 12:16:26  
Suckin air in around throttle shaft.



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old

05-23-2004 13:37:08




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 Re: carburator icing on WD in reply to Davey, 05-23-2004 12:16:26  
Its just plane normal for it to do that, it doesn't hurt a thing



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