Ed Anderson wrote:

 Because, I have painted my aircraft I am reluctant to cut into the cowling
for a ram air induction.  I have a partial one in that my engine air intake
is a hole in the oil cooler plenium just in front of the oil cooler.  During
ground runups I get 200 rpm more with that cowling on than with it off.  The
only thing I can figure is that the plenium gets slightly pressurized by the
prop blast even on the ground and that promotes more air into the engine.

I really think that Tracy's ram air intake (especially at altitude) is a
signficiant contributor to his power.

Ed Anderson

 
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