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

BTW one of the basic rules in business is one must differentiate ones
product
from the competition even if it does not work. Nobody is going to bother
to do a scientific comparison. This applies to electric water pumps as
well :-)

Here is my youtube video on how to build a port.

https://www.youtube.com/watch?v=NKJ00JsnS8A
<https://www.youtube.com/watch?v=NKJ00JsnS8A>

180,000 hits.

Paul Lamar


To me it looks like someone was grinding on MFR p-port housings looking
for a bit more power.

Dale Davies



http://www.turborx7.com/repics.htm


http://www.turborx7.com/porttiming.htm

The early stock Factory Pports were "D" shaped with the arched shape at the top. Most builders turned this into a rather large rectangular shape as in your picture. This took the smaller 12-A to over 300 HP at 10,000 RPM with a 48IDF Weber and 44MM chokes.

Paul Yaw wrote some really nice tech data on port timing and various maladies you might see not only in rotories but piston engines as well. see hyperlinks.

Also port timing for most engines.

Lynn E. Hanover


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