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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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