Paul, I am interested in your comment that the housing is not a true
trochoid. What is your reference that it is not?

Jon Lauter
Rotary Power Marine Corporation
www.rotarymarine.com

I am not sure where I heard this but somebody measured one with 
the intention of duplicating it. I think it was Dennis Hayes.
I am not sure what Mazda does.

I know that early grinding machines were built assuming it was
a perfect trochoid. As I recall Curtis Wright wrote a paper on
the subject of rotor housing manufacturing machines quite awhile ago.

Modern NC machines will give you any shape you want so the perfect housing
should cause no in and out motion of the apex seal given all
the deflections and distortions at operating temp and at high RPM.
A change in angle, yes. I don't think anything can be done about that.

No apex seal in and out, therefor, no jump.

Paul Lamar
 
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