Posted by bc on November 26, 2008 at 19:34:02 from (68.88.175.43):
In Reply to: Carb ice posted by wallacedw on November 26, 2008 at 12:38:33:
A number of factors cause carb icing on airplanes. At high altitude the air is thinner and enriches the mixture. Pilots naturally use the mixture control to lean it out to save fuel when flying. In icing conditions at altitude there is a lot of moisture in the air which is cold and which freezes when it hits the plane. Also there is cold air blowing over the engine at the speed of the plane cooling the engine. Since the tractor doesn't have cold air blowing over it at 100+ mph, some of the natural heat from the block kinda keeps the carb at least luke warm.
Finally, pilots when landing use the carb heat and full rich mixture as a safety precaution since their life may depend upon it if the engine quits.
Richen the mixture and check to see if you have a fuel flow problem from the tank cause of rust, etc. Put a piece of tin or cover or something to cover the exhaust manifold that extends down over the carb to help trap some heat in there. Nothing too elaborate.
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