Dean, youre pretty much on track,,the voltage necessary to arc jump current across a given gap is a function of the gap thickness and the medium (fuel and compression) in which it fires. When the coil fires its voltage ramps up b ut only until its high enough to fire the plug and no higher and in a stoc k engine that may be 5K to 15K volts or so depending on gap and c ompression. The HV coils advertised to fire at 40,000 volts =dont mean they fire at that voltage, if only 10,000 fires ther plug thats all they go to but if you widen the gap and/or raise the compression 30 to 40K may be necessary
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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