AFAIK carb icing occurs because of the petrol's latent heat of evaporation dragging down the temperature of the inlet track as it is vaporised by the jets. When the air temperature is cold to begin with, this results in any water vapour in the air forming ice on the cold metal parts ruining the fuelling of the carb. It happens when on the move, not so much because of the air flow, but rather because the carb is vaporising more fuel at that time. As soon as you stop, the heat from the engine is conducted into the carb and melts the ice.
The way I see it, there are three ways of preventing it: warm the air before it gets ingested; use a fuel additive (don't know how these work though); or fit fuel injection
I don't know how warm the air has to be to prevent icing... but I wouldn't like to bet on Cadwell being warm enough next weekend
20-Mar-2006, 02:58 
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