Originally Posted by 1project2many
This^^^
If you tried to use a dizzy to create the needed crank signal, you would actually need to create a 14x wheel, with two offset notches, in order to have proper timed signals, due to the cam rotating at half the RPM of the crank. As factory installed, the 660 DIS system uses a 7x wheel (6 equally spaced notches and 1 offset by 10 degrees for a home signal).
There have been various ways that people have made the crankt triggers on engines that do not have them. I've made an external trigger wheel that attaches to the front of the harmonic dampner for a couple of mine.
On my 1985 GMC Jimmy, that I built a turbo hybrid for. This used a 2.8L block, so it didn't have crank trigger sensor provisions, even though the crank I installed, a FWd 3.1L unit, had the notches.
I used the same wheel with some modifications and new sensor mount when I installed the DIS system on my Nissan I6:
I'm now using this same trigger wheel and modified teh original mount to fit on my current LX9 (3500).
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