Peter Nunn wrote:

Paul
I think (again after more fiddling about) that the following is correct:

3 rotor revolutions = 1080 degrees
gives 2 shaft revolutions or 720 degrees
which then gives 360 degrees of distributor/sensor rotation, therefore
40 degrees is 1 chamber firing angle on the sensor.

Is this logic correct?

The face of the rotor does indeed rotate once while the e-shaft rotates three
times. That means a new face of the rotor comes up on top dead center
once per e-shaft revolution so the spark has to fire twice per e-shaft
revolution because it is a two rotor engine. Since there are four teeth 
on the distributor or crank angle sensor that means the distributor or crank 
angle sensor rotates at half e-shaft revolutions.
It is a tricky engine. I have been fooling with it for almost thirty years 
off and on and and I am still learning things about it.

Paul Lamar
 
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