You need a big

enough displacement engine to make your required HP at 2800 RPM max
and you need to air cool it.

marc wiese wrote:

So what happened to Porsche and the PFM2000/3000 series? That design was
"suboptimal" out of the box.........I know because I flew one in a Mooney
for a while. There may even be a few still flying. Wonder if those fans
will ever draw enough cool air over those fins.

 
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