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Rob: That is what can occur when a non-heated large thermally conductive mass meets up with a sympathetic dew point and the Bernoulli principle in a venturi. The carb venturi gets smaller, forcing the air to speed up in order to pass the same mass in a given unit of time. The air takes heat with it, cooling the mass via evaporation (carb and manifold), and since the dew point (the point where atmospheric water vapor becomes visible i.e."fog") is at or above the temperature of the carb mass, water condenses on it just like on the outside of a glass of iced water. At lower temperatures, this water can and does freeze, and it is such a significant and repeatable phenomena, that on aircraft, ducting is provided to shuttle exhaust heat up to the carb to prevent icing. This heat thins the mix by expanding the air, which decreases the power and efficiency, so it is only used during take off and landgins, and during times of carburetor icing at altitude. That's about all I know at 4 am, so forgive me if I mixed a split infinitive with a participle. Frank
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