The original inlet was a straight thru inlet to the cooling fins only.  It
worked at 7,500'.
At 9,500' the oil temp just keep climbing to the end of the yellow arc.
By descending back to 7,500', the oil temp would drop back into the green arc.
Max continuous cruise power at 7,500' still allowed the oil temp to stay in
the green arc.

The NACA inlet allows me to cruise at 9,500' with the oil temp in the green
arc.  (Full throttle nonsupercharged at 2430 RPM.  175 to 180 true mph)

Any suggestions on how to improve the oil cooling?

Jim Ayers

Put a genuine heat exchanger in there Jim:-)

Paul Lamar
 
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