MikeLMR

well the Aussies seem to be well up on high rpm rotaries so a search on www.ausrotary.com will reveal a wealth of knowledge. IPRA would be a good key word to search for first as they are running at rpm's up to 12K+
From what I understand a key bit of kit for high rpm rotaries is a two peice eccentric shaft with centre bearing + an engine builder who knows what they are doing !

Rotortuner

ya, there is a video somewhere of a guy with a 12a on an engine dyno doing like14.5k yes you read right. its an all aluminum block, RB AL plates etc. It was MFR PP. 2 peice Guru eccentric shaft and all the other good stuff. So its possible. If someone can help me i can put up a pic of my clutch thats capable of 14k.

CJG

peejay

Don't forget, since internal stresses go up as a factor of RPM, the higher your average engine speed the shorter the lifespan.

The world's most powerful two rotor at one time (360hp from a monster bridge 13B) had an engine lifespan of six hours, which was enough for ten 30-minute races and some testing/qualifying, or in other words, one season. I think some Aussies have got as high as 380hp, but I'd imagine that engine lifespan is even less.

If you're drag racing, the point is moot, since you run at max RPM only momentarily. That is how some people manage to get away with so many stock internals. Road racers who have to live with stock internals build engines with the understanding that it's a Dixie cup engine. Use once or twice and if it's still good after that then count your blessings.

MikeLMR

some of the improved production engines in Aus do a whole season or more without a rebuild ! (so I have been told by a reptuable source) ... not sure if the engines they are using are hitting the high 300's or if the figure is lower due to the regs. Take a look here ...

http://www.mazdarotaryclub.com/forum...&highlight=cpc