David Morris wrote:

G'day from DMRH

Paul.

I hope that when you are cutting your PP inserts you are matching the port
position & angle that the factory recomend. I expect you already have access
to a "FACTORY RACE" rotor housing housing to use as a model.

I have seen many cases of people that thought they knew better than the
factories time & investment & positioned the ports when they thought they
should be. The resulting power output was less than impressive. You can always
tell a ported rotary with the wrong port timing by the exhaust tone. (usually
a rather FLAT sound)

Whilst a pair of "FACTORY RACE" rotor housing costs a few thousand ($ U.S)
Copying the design is the way we do it here which is why our companies engines
perform the way they should & are not amazing or exceptional like other tend
to think.

REgards
           Dave Morris

Perhaps it is important for drag racing and road racing but we have several 
examples that work well. Racing Beat and Everett Hatch. Also the pp housings
from Mazda Racing vary. The two on the left are Mazda Racing the two on
the right are Racing Beat. The Mazda Leman engines is different again.

Paul Lamar
 
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