They raised the RPM where peak power is generated by adding 30% to the
intake
and 17% to the exhaust port areas.

HP = (Torque x RPM) /5252

Assume for the moment torque is constant.

So 8500/6500 x 185 HP is 240 HP.

I also think they made some sort of improvements in the oil pressure
system.
I am pretty sure the rotors are not significantly lighter in weight.

A peripheral port version of the RX8 motor should generate well over
325 HP with a Lemans type fixed intake system at 8500 RPM. Even with
side exhaust ports.

I don't agree the RX8 engine is a step backwards. Perhaps a little

more

heat is rejected to the cooling system but the later timing of the

side

exhausts ports does indeed result in more energy being extracted from

the

fuel.

Until we have an RX8 engine on a dyno I don't think we will find out

what

the best BSFC is. I am sure the BSFC at low RPM/power levels is far
better than the older engines. That was Mazda's main focus on

developing

the side exhaust ports.

Hmmm. The original post indicated that the venerable 13B breathed better
than the Renesis. Is there anything like volumetric efficiency data to
support this?

Regards,

Rob

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