Pissed off with motor, want to change

jimmyray said

However, at TDC, when timing is set to 0, the rotor should be 5-15 degrees AFTER the #1 wire location on the distributor. Therefor, as the mechanical advance kicks in, the it gets closer to center and then a few degrees positioned BEFORE the #1 wire location.

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Jimmy you are getting way way WAAAAYYY off into left field here

THE CHANGES IN MECHANICAL ADVANCE DO NOT CHANGE THE RELATIVE POSITION OF THE ROTOR

This is because the timing of the spark relative to rotor is TIED to the rotor position by means of the reluctor The two are hooked mechanically together an CAN NOT change--unless something is loose.

THE ONLY TIME a rotor changes "rotor phasing" which is exactly what you are referring to, is changes due to VACUUM ADVANCE or a mechanical problem in the distributor itself, such as poor mechanical tolerances, loose shaft, improper reluctor installation, etc.

The reason VACUUM advance changes rotor phasing is because it is NOT tied to the rotor. Vacuum advance effectively moves the spark postion without corresponding move at the rotor. However, this IS designed into the distributor. So unless there is something loose, or the vacuum is "over advancing" or the dist. is badly worn, a non issue.