In the process of installing the Lamar Instruments Inc. high speed
multi-spark ignition on the RV4. I rethought the optical trigger.

I used two pick ups and a bearing on the end of the e-shaft
on the first design. The idea was to keep the disk with the holes
in it precisely aligned with the optical pickups. It was rather expensive
to make as well

That was not robust enough on the RX7 road racing car we tested
it on. It failed mechanically. It looked like a good idea at the time :)

This design is more typical of the reluctance sensor mounting on
the stock 3rd gen RX7 and the RX8. If you have a second
gen CAS you can do away with it and use the hole for a dip stick
and or engine oil filler.

There are two optical pick ups in one housing and it can be mounted with
a simple strut up from a bracket on the oil pan bolts.  The trigger holes for the rear
rotor are displaced radially. All Mazda rotaries have oil pan bolts in roughly
the same place.

Paul Lamar

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