COP Ignition Development

BigBlockMopar said

Nice work.
About the 'why not a crank trigger'... On my seasoned 318, in which I installed a new timing chain a few years ago, I can measure upto 5 degrees of retard when quickly revving the engine from idle.
Adding a collar on the distributor did nothing. Have had the distributor apart a number of times, no issues there. Which let me to think it's the camshaft that wanders forward and back during engine acceleration.
Was very noticable with a timing light.

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The mopar VR distributor is likely responsible for timing change. VR in industry is for pulse counting, not position measurement. The VR ampitude varies with speed, and rise time to hit sensed level with that. Mopar was after cheap. Optical and Hall sensing do not have that problem. But with that said, it can be taken out with curve you set. A bigger problem on VR is run out, it changes timing between cylinders. Vane sensing as in optical and Hall fixes that too. If you want to test for that, trigger light on #6, compare to #1. Or with degree wheel check them all.