Pulled this image from an eBay listing
Have not seen this style/shaped pp before.

Dan Gorsline.

Neither have I.

If your racing it might gain a few HP.
Not worth the trouble in an aircraft engine.

Paul Lamar

Interesting. I wonder if the shape of the p-port has influence on the potential
power increase in a wankel engine. Paul, enlighten us!

Jacobo Guimeráns

It does up to a point. A round hole will give you 90% and it is far far lower cost
and easier.

Paul Lamar


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