v-6 in early A-body

My research of the V8 tone ring is 8 slots, that is two per cylinder, since four ignitions per revolution. The timing distance between slots is about 45 degrees, for advance control, and the other 45 degrees is time space outside advance control. Base timing hard set adds to total timing. Slot width is about 5 degrees. Base timing reference is not adjustable, because it is related to sensor location (bolted). The CAM (distributor) sensor must be adjusted correctly to index engine phase.

My interest in all of this is the ability to make a crank/cam sensor simulator for use bench in testing ECUs. I have made many simulators for all sorts of engines. It only takes me a few minutes to write the code, the hard part for me is to get the The timing wheel / cam shutter information and how they are referenced to each other. For about $3 a USB powered Arduno Nano can be purchased for use as simulator. The simulator ramps RPM up and down for test use in monitoring ignition coil signals and injector signals. Instead of coil and injectors, resistors are used and pulled up to 5V source, then an inexpensive logic analyzer is used to accurately measure signal timings.

On the V6, the ignition interval is 120 degrees with 3 ignitions per revolution, vs the V8 of 90 degrees and 4 ignition events. The 4 slots are at 20 degree intervals for an increased timing control range of 60 degrees. The 4 slots, result in less degrees to sub-divide in timing control, a V6 is less smooth in rotation, the multiple slots will improve timing control in the event RPM varies in the timing control window. The 4 slots provide near reference points, within 20 degrees or less to desired timing.