"Rogers, Bob J." wrote:

I was always under the impression that the eccentric shaft rotated three (3)
times for every 360 degree turn of the rotor.  That would be a ratio of 3:1
not 3:2

Me too. That is why I am confused when Mazda says it is 3:2
I think it has to do with the fact that the rotor is also rotating
and one rotor face completes 360 degrees while the shaft rotates
three times. The gear ratios is still 3:2 as there would not
be enough room around the e-shaft for a stationary gear that
was roughly only 1.16 inches in diameter. That is the stationary gear size
required if the gear ratio was really 3:1. The pitch diameter of the rotor
gear is about 3-1/2 inches in diameter. The main bearing alone on
the e-shaft is about 1.7 inches in diameter.

Paul Lamar
 
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