This one uses the trick of connecting the primary port
of rotor one to the secondary port of rotor two and vice versa.

It is extremely compact and can be tuned up to 7000 to 8000 RPM
my guess. A peripheral port version would be much simpler and much easier
to fabricate.

This is a fascinating subject and I wish I were Mazda and 
had the resources to investigate some of these configurations.

Paul Lamar
 
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