Here is something from the MSD Pro Mag web site that is relevant
to the rotary. Triggering the ignition off the front of the
e-shaft as done on the 3rd gen and RX8 (or better yet, the flywheel) 
is much more accurate than using the second gen 13B and three rotor 
20B crank angle sensors. Now here is the good part. Unlike a four cycle 
piston engine there is no need to determine (usually from the camshaft) 
when the combustion chamber is on the proper cycle to fire. The rotary 
always fires at a specific e-shaft angle. Twice per rev on a two rotor
and three times per rev on a three rotor.

Paul Lamar
 
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