If you assume that the graphs are representative of a 4 cylinderengine, then the 90 degrees of rotation of the distributor shaft represents theactivity within the coil for one cylinder to receive its spark. The images on the left and right areOscilloscope traces I made of what is going on electrically in a 3.8 Ohmignition coil during the interval between the generation of sparks when runningat 1440 RPM. Just what is 'Dwell' when referring to theignition system in an internal combustion engine and why does it matter? Dwellis traditionally referred to as an angle but for this explanation, Dwell can bedefined as the time during an ignition 'cycle' that current isflowing into the ignition coil.
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