Just to add one more tid bit to the correct answers......When the coil fires the voltage IS NOT instantaneously at say 10,000 volts, it begins to ramp up until its high enough so current can arc jump the open NON conductive plug gap HOWEVER if theres a conductive path due to oil or carbon (fouling) the coil starts to conduct current and thus expends its energy and never rises up to the high voltage to arc the gap. When you introduce that added extra gap current cant flow through the oil/carbon so the voltage does rise until POW it fires the plug.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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