"Quirk, Kevin KA" wrote:

Paul,

As far as I know, the Mazda epitrochoid (generating radius = R) is oversize (=a) to move the contact point of the apex seal around it's radius as it moves around the housing.  I think there is also another reason for the housing not being a true epitrochoid so I will look it up when I get home if you are interested.

R+a = 105 mm (eg. R=102, a=3 OR R=101, a=4)

I believe that the values of R and a were changed in the mid eighties and that is why it is not recommended to interchange rotors/housings between these years as per Racing Beat manual.

Kevin Q

 
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