You will not get a significant amount of additional power at 11:1 because
the rotary combustion chamber deteriorates quickly as the compression ratio
rises above 10:1. Too much surface area so the fire goes out. IMHO
alcohol is probably more affected by a combustion chamber with a high
surface to volume ratio. Just a wild ass guess on my part. If higher
CR's  worked Mazda would have used them years ago on the NA engines.
I know they spent millions researching this.

Paul and Doug,
 Gordon Jennings a long time two-stroke Guru was spirited away by the US gov. to work on engines for the Predator and similar aircraft. They wanted a small high power engine for obvious reasons. He had the chance to do several high compression studies on our dime. One of the things they found kind of hearkened back to the old days of flathead V-8's. If the area in the squish band or other portions of the combustion chamber got smaller than approximately .010 inches the fire simply goes out. The study of this phenomenon is nearly identical to a high compression rotary. The clearances become to small in higher compression ratios. I'm sure the cooling effects in a rotary are, if anything, worse than any piston engine. FWIW
Bill Jepson

One of the reasons it is capable of such high HP when turbo charged.
Pressure and heat that would melt a piston engine combustion chamber. The heat of
combustion is spread over a wide area of the rotor housing and rotor face.

Its got its ups and downs.

Paul Lamar
 
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