I just want to know one thing- all the years of rotary{30} the factory rated
hp {stock} is 6500rpm and nobody targets that rpm. Tracy is right there, but
not quite. It's either above or below some by some amount. Even the third
gen. twin turbo is 6500. That's what the porting is designed for, stock. Skip

It is not that simple. Cars need low RPM torque and HP. Aircraft engines don't.
Aircraft engines need all the top end power they can get consistent with long life.
Mazda was and is optimizing the engine for use in cars. Not in airplanes.
That is the reason for the six port and the dual dynamic chamber designs.

The higher the RPM the more HP you can get as the engine will breathe well
to over 10,000 RPM with PP ports. The RPM limit is the centrifugal loads 
on the rotor bearings which is now about 10,000 RPM. Future lighter
weight rotors will up that limit.

According to my sources Mazda recently lowered the RPM limit on the new RX8
engine with new light weight rotors to 8500 RPM and 250 HP from 9500 RPM 
and 290 HP as they needed more low speed torque. In other words they
sacrificed top end HP for more low speed torque.

Paul Lamar
 
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