Posted by JerryMT on January 05, 2014 at 06:34:33 from (206.183.116.145):
In Reply to: Frost on Carb of gasser posted by landresource on January 04, 2014 at 17:52:57:
Bernoulli's equations relates pressure to velocity: p/rho + 1/2 v^2=constant. Using the gas law, p/rho= RT gives us RT + 1/2 V^2 =Constant.
So as velocity increases, T decreases. The other situation that is occuring is that gasoline droplets volatilize in carb venturi as the pressure drops and that further decreases the temperature as the change of phase from a liquid to a gas takes energy and that energy has to come from the air so it cools the air even further. The net result is that the surface area around the venturi gets very cold and frost will form on the carb at ambient temperatures as high as 50°F. External frost won'tharm performance as long as the likage is not effected.
If the air is very humid, ice will form on the fuel nozzle and in the venturi, throttle plate, etc internally and cause really ratty running. There is nothing that can be done save heating the inlet air to prevent this type of internal icing. Generally allowing the engine to run ratty will eventually allow the exhaust air to heat the intake manifold on these old tractors and that allows the internal icing to clear up. Many of you remember when the first EPA emmission regs were applied to cars that heated intake air was used because of the leaned out mixtures used on carbs of that era were particularly susceptable to internal icing. Recip engines used on aircraft use carb heat to preclude internal icing also.
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