Al G dynoed his 20B at 295 hp @ 6800 RPM if I remember
correctly. (might have been 285) Al chime in if you see this. The 20B is 50%
bigger. (or 1/3 if you prefer) The engine simply doesn't have to be as highly
stressed to produce power. For the ES GET THE 20B.
You remember quite correctly; 290 @6800
(sea level, std day, and all that). More important to me with 2.17 : 1
re-drive, it’s about 265 hp at 6300 (2900 at the prop), and 200 at an easy
cruise rpm of 4800. That engine should go many hours at those conditions. If
you want more horses, go with 2.85:1 re-drive.
All up FWF weight (w/o prop) is about
425# including coolant and radiators.
I have no first hand experience with the
Renesis; but for an ES, I’d go with the 20B.
Al