Dave is correct, Imagine a setting of .0005" (I know but go along with it) The cam lobe comes along and only the very tip of the lobe hits the rubbing block (very late, no dwell) If the point gap were .40, the cam would just get the points closed, and then they would open again (Early). Geometry. I agree that timing cannot be set by ear. In today's cars timing is however set by ""ear"". the knock sensor listens to the engine for the initial indications of spark knock (at a level so tiny we could never hear it) and sets the ignition timing algorithm to stay at that tiny knock level through operating range from running idle to full power from cold to full temp. The best we can do with a 1950ish tractor would be to apply a knock sensor, run the tractor under full load with the fuel of choice, and adjust the timing to just barely begin knock, and lock it down. Springs and weights would need to be tailored to meet the real world curve, but that is pretty high effort. Getting some advantage of today's fuels probably does allow more advance. But the timing still needs to be where it will start without backing up against starter rotation. Jim
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