Hi Bill,
I was able to do bench testing of the electronic advance distributor, it works well. Then I got sidetracked by some contract work related to to diesel injection controls at a couple customer sites. One of my projects was a timing signal converter where I convert a 120-1 tooth wheel to a 72-1 tooth wheel with adjustable phase offset. It is an electronic way to provide timing signals to a diesel pump by using existing optical signals on the machine that rotates the pump. The good part is what I learned, is easily applied to ignition and fuel injection. If I make a module with a small inexpensive uC, it can save resources on my EMS by making signals that directly interface. Presently I use interrupter tabs, where the leading tab width is 40 degrees, so with a base timing of 10 degrees there can be 50 degrees of total advance. The uC resolves timing advance in an accurate way, and uses predictive means for proper dwell control.