coil discharge.. a coil discharge voltage is based on the resistance of the discharge path. The higher the resistance, the higher the voltage will be.
Increasing the resistance will increase the voltage. Once the voltage is high enough to overcome the resistance or gap, the coil will discharge. Making the voltage higher means it will jump a bigger gap or fire through a simi fouled plug. This works up till the voltage is high enough to overcome the insulation of the coil and short across internally or across the plastic output of the coil, as many coils will do, with no wire hooked to them.
Air has resistance. In a vacuum, it takes less voltage to jump a gap. As pressure increases, in take more voltage to jump the same gap.
changing to carbon wires or resistor plugs can increase the voltage and give you a """hotter""" spark potential. Adding an air gap will also do this. Remember however once the voltage is high enough to jump the gap, its going to fire/arc/discharge at that point and not go any higher. So a good plug will fire at a lower voltage than a bad plug.
A shorted plug will simply drain off the charge through its alternate path,, and not jump any gap and therefore produce no spark to fire off the gasolene.
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Today's Featured Article - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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