Re: Super C icing-up

Posted by captaink on April 07, 2006 at 14:05:05 from (66.115.214.56):

In Reply to: Super C icing-up posted by Trickster on April 07, 2006 at 13:34:43:

This is totally normal. It is caused by the venturi effect which is that when air passes through a space that is smaller in diameter (like the venturi of a carburetor), the air flow speeds up and absorbs heat from the surrounding surface. This removal of heat (or cooling) will condense moisture in the surrounding air on the cooler surface. If the temps are close enough to freezing, ice will form not only outside but also on the inside. This cooling affects the air/fuel mixture causing the engine to run rich until heat from the exhaust manifold overcomes the cooling venturi effect.

Now, is this what is causing your engine to stop after 20 minutes or so? Well, it might as this condition can richen the fuel mixture enough to flood the engine bad enough to cause it to stall. If you are seeing black smoke from the exhaust before it dies, then this is likely the cause. The cure is to run the engine faster or somehow get heat to the area that is freezing up. Sometimes gas line antifreeze (or running ethanol) will absorb enough of the moisture inside the carburetor to cut down on this problem.

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