Posted by Owen Aaland on July 15, 2009 at 19:02:03 from (65.165.246.156):
In Reply to: Sweaty Carb posted by pete 23 on July 12, 2009 at 11:53:43:
pete 23 said: (quoted from post at 11:53:43 07/12/09) The sweating is due to the vaporization process of the fuel and humidity in the air. As anything changes from liquid to a vapor it draws heat from somewhere so carb get cold and moisture condenses. May not be the pure scientific explanation of the process but that is the point of it anyway. Also, the better it vaporizes, like with a leaner mixture or better venturi system the more they sweat and if right outside air temp, freeze up. As far as running a minute, sounds like fuel supply into carb problem.
The fuel vaporization is only part of the reason that the carb gets cold. The other factor is air pressure. When air is compressed, heat is given off. This is the reason that air compressors get hot. The reverse is also true. When pressure is reduced the air gets colder and draws heat from whatever is around it. Moving air has less pressure than static air. The venturi causes the air to move faster, since it has to pass through a smaller opening, and is used to drop the pressure in the carb in the area of the fuel nozzle. The atmospheric pressure on the fuel in the carb bowl is then more than the pressure at the venturi which pushes fuel out the nozzle. This drop in pressure in the venturi also draws heat from the surrounding carb. Under the right conditions this can cause ice to form on the nozzle and restrict the fuel flow.
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