Where do these stories come from?  : )  There has been no change to the 2.85 (RD-1C) design.  My takeoff RPM is around 6200 rpm (limited by fixed pitch prop) and top speed rpm is 7450 so far. 

 

Top speed runs have been limited due to oil mist blowing out of the crankcase vent at anything above 7000 rpm.  Still working on an oil / air separator needed for air racing.  No time for making this and new prop cuffs so I'll miss the Ohio to Oshkosh race this year.  Look forward to doing it next year in the 20B powered RV-8 which is moving ahead (finally).  I noticed they are separating the formula RV classes by engine displacement   Bwahh Ha Ha Ha! ....  : )

 

Tracy

 

 

 

MY PSRU is not dissimilar to Tracy's in regard to using the 2.85 Ford E4OD Planetary. Just differently configured, but then again I'm led to believe that Tracy has changed the design for the 2.85. I personally prefer different bearings. I don't plan on going over 7,500.

Someone mentioned to me Tracy didn't exceed 7,200 on take-off, with the 2.85.

 

I hoping for 115 to 125hp at 7,500 rpm, I think that's achievable!

 

George ( down under)