Not sure if this is applicable to the rotary, but all our piston racing
     > engines
     > incorporate both mechanical and exhaust augmented vacuum devices.
     > We want negative pressure in the "crank case", to eliminate blowby and
     > improve ring sealing. We do, in fact, install the main crank seals backward
     > due to the amount of vacuum

Archie, Almost every modern 4 cycle large displacement motorcycle uses this
tecnique. Kawasaki was first on street bikes the ZX-10 I believe. The thrashing
of the crankshaft on piston engines consumes power at max RPM. Most 4
cylinders also have "flat" cranks with 2 pistons going in and 2 out like it was
a huge twin. Lots of air being moved. The rotary is less effected. The setup may
still have a small benefit.
Bill Jepson

 
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