Posted by John B. on January 04, 2014 at 18:40:24 from (50.40.113.103):
In Reply to: Frost on Carb of gasser posted by landresource on January 04, 2014 at 17:52:57:
It is due to the venture in the carb. The vacuum on the one side of the venture is where the air fuel mixture is pulled in thru a small opening and exits thru a larger opening thus causing the air to expand helps the fuel air mixture to atomize.
Let the air out of a large tractor trailer tire and watch the frost build up on the end of the valve stem. The escaping air causes a vacuum around the outer tip of the valve stem as the air pressure escapes and expands to a lower pressure which causes a rapid drop in temperature.
An air conditioning system works on the same principal. As the Freon goes from high pressure to low pressure thru an orfice. At the exit of the orfice the pressure turns to vacuum causing the freon to vaporize letting it take on heat from inside the cab of a vehicle. As it absorbs heat and warms the Freon it turns back to a liquid.
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