Interesting info Professor,,,,,I have seen both the wire itself and the illustrations of the helical/spiral wound wire used to reduce RF interference, they look expensive but dont have the high carbon resistance of just cheaper carbon core wires. AS the plug gap widens and/or resistance increases it takes a higher voltage to arc jump the plug gap but theres always engineering trade offs. Theres only finite X amount of energy stored in the coil during the current conduction phase which gets expended into heat losses and V x I x Time when the field collapses to raise the Secondary voltage to fire the plug. Therefore, if you widen the gap (or I guess add resistance) which necessarily increases the voltage rise before current arc jumps the plug gap, either the current and/or the arc duration time must decrease.
Looks like all agree carbon core wires are NOT favored for old tractor magneto ignitions but the theory gets a bit complex, maybe more then I spoke of......
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