Posted by Owen Aaland on January 04, 2014 at 22:03:43 from (216.47.34.47):
In Reply to: Frost on Carb of gasser posted by landresource on January 04, 2014 at 17:52:57:
Evaporation of the fuel and the effect of the venturi are part of the reason for the temperature drop but the major cause is the pressure drop caused by the throttle plate being mostly closed. The closed throttle plate also causes a venturi affect.
At low rpms the vacuum is greatest in the manifold and the volume of both fuel and the air going through the venturi at their lowest. It is also when carburetor icing is most likely to occur. Under heavier loads the throttle plate is more fully open and the manifold vacuum drops off. At this point there is more fuel being evaporated and there is much more of a venturi effect at the venturi but carburetor icing is less likely to occur.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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