This is what did not work. 

The airflow is restricted behind the rad which is a no no. All 
the theoretical work done for the last 75 years confirms this.  

The entire cowl must be pressurized and VERY well sealed to insure 
air flow through the rad. Very very tough to do. 

A high level of radiant heat from the exhaust system 
impinges on the rad. Another no no.

The heat of the engine compartment is added to the ambient air temperature 
to lower the rate of heat transfer from the rad to the cooling air.
The rate of heat transfer is proportional to the difference in temperature
between the rad and the cooling air. It is very important to keep this 
difference as high as possible. Particularly with liquid cooled engines 
as the difference is only about 100 degrees to start with.

Thanks chuck for sharing this with us. It is very helpful to find out
what does not work as well as finding out was does work.

Paul Lamar
 
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