Posted by Tom Fleming on January 17, 2013 at 15:47:28 from (67.20.233.75):
In Reply to: ice on carb posted by Mlkgsmer on January 17, 2013 at 03:38:59:
Sorry previous post was long winded. Here are basic examples. Pour some acetone or ether on your hand. It evaporates and cools your hand because it absorbed heat from your hand to vaporize the liquid. Same principle when vaporizing gasoline.
2nd item. As stated in previous post, when you drain the water out of your air compressor, it can freeze up and create ice, which causes the water not to fully drain until it thaws. In a carb, the air flowing through the venturi is accelerated and the volume is reduced. After it exits the venturi, with the gaoline DROPLETS (not vapor yet), the volume is dramatically increased when it hits the intake port and has the same velocity.
couple the heat of vaporization (heat capacity) and the decrease in pressure exiting the venturi, tempurature drops like a rock. now, after the tractor has been running and everything is up to operating temp, icing tends not to be a problem. But that is all predicated on being at operating temperature.
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