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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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