"Weinstock, Rob" wrote:

One of the things I'd like to understand better is how/why the 13B is
superior to the Renesis, breathes better, but makes ~66% of the peak
power.

Otherwise, very informative!

Regards,

Rob

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.

When the electric assisted turbo charged version of the RX8 engine appears
you will see much better acceleration performance out of the RX8.
Probably exceeding the acceleration performance of the stock 1995 third
gen 260 HP sequential turbo charged RX7 despite the extra weight of the RX8.

Paul Lamar
 
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