Hi Hans, Doug , Ed, anyone else,
looking at the Mazda dyno graphs,
All  RX8 engines are side port, the 4 port makes 200+ at 7000  right
out of the box, so you can easily get 170-180 at 6000 rpm.
BR, Dave McC

So long as you start with the RX-8 engine, that may be true.

 

Here is some data from a strong running 12A from my GT-3 racer. This a bridgeported engine

of 2292cc displacement with a Weber carb and 38mm chokes.

 

There is no data below 6,500 as we don't go that low except leaving the pits.

 

6,500 RPM

139.6 foot pounds of torque.

HP 173.3

EGTs 1550-1491

BSFC .666

oil temp 162

oil pressure 99.9

A/F 12.3

Timing 25 BTDC

 

Best power 244.9 HP at 9,400 RPM

 

Each of the two 38mm holes feeds only one rotor housing. So are quite restrictive, and the 13B has the larger displacement, so you could do better HP wise.

 

 

Lynn E. Hanover