If a tooth equals 18 degrees, is it true that the cam gear has 20 teeth for
360 degrees?

No, that would mean the crank sprocket has 20 teeth and the cam & IP have 40.
One tooth equals 18 degrees at the crank, not at the cam.

Or some ratio.  I don't think there's quite 40 teeth on the cam
sprocket.  But it could have 20 and the crank 10.  (And I don't
think either of these figures is right.)

-- Jim


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