Hi Paul,
I am wondering if you could direct me to some charts of BSFC vs. RPM/HP for
the 13B and Renesis w/ and w/o P-ports.  I'm looking for a sweet spot for
cruise on a Sportsman I am building and want to incorporate a rotary.

Thanks,
Dan Kidd

Mazda keeps that kind of data real close to the chest.
As far as I know it does not exist outside of Mazda's
dyno rooms.

However the rule of thumb is the best BSFC always occurs
at the torque peak P-port or side port RPM. The torque peak RPM is
a function of the runner length.
So all these curves apply. You have to add the fixed length to
the last set of Lemans eng. curves.

A p-port has better BSFC as the pumping losses are lower.