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



This square shape of intake and exhaust peripheral port is also in images from NASA: SAE paper 841018, 'An Overview of NASA RE Research program', and in C-W or John-Deere research, I have it on my files, also the Mazda Le Mans endurance race winning car had something similar.

For those interested in old research, articles in SAE Journal, Automotive Engineering:

'Lubricating Rotary Engines', Vol 60, n 3, May 1972, pg 23-35;

'More HP from small REs', Vol 8, n 6; June 1972, pg 30-35;

'How much overall Energy does the Automobile require?', Vol 80, n 7, pg 36-40, July 1972;

'Combustion and emission propoerties of REs',  vol 80, n 7, pag 26-29; Jul 1972;

'Low Octane fuel is OK for REs', Vol 80, n 8, pg 28-29, Aug 1972;

contain useful information, it's cheaper to purchase in the SAE.org site a full back issue than a SAE technical paper.

Hope you like this, thanks, regards, have a good season, + Salut

Jose Gros-Aymerich

 Madrid, Spain

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