ignition reference

[Sandy]

All this talk of making/using an encoder, just use a steel wheel with a VR
pickup, like most everybody else is doing. If you like you could also use a
hall effect pickup. One thing again, is that if you are getting timing from
the distributer, it will be subjected to a bunch of error, many from chain
(belt) stretch, and other cam related jitter. Ask someone how their
electromotive distributer pickup works! (have has several bad stories) 

But, back to the problem, you can easily get a laser cut wheel made of steel
(or plastic) that can be made to your fancy. The cost will be < $50.00 QTY
1. All you need is a DXF file from your CAD program, and you have it, dosent
matter what shape or size. 

Sandy