Anyone know of a good reason NOT to do that?

Thanx,
Joe Hull

Joe, Paul and group,

There are many good reasons, "not to do that". The most telling reason 
can be explained by anyone who has flown behind a variable pitch prop. 
After a certain speed is acheved the fan is simply IN THE WAY of the air. 
Like a vp prop in flat pitch the air can't flow through properly. This 
is a problem for high speed cars as well. Most cars capable of 100+ 
continiously use some kind of dump on the radiator shroud to allow 
the air to route around the fan.  Bill Jepson

Also it is not good to heat the air before it goes through the rad.
My rule of thumb for a liquid cooled engine is a one degree rise in the 
incoming air temp results in a 1% drop in cooling.

Paul Lamar
 
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