The path doesn't include but one plug at a time (on this engine, (several engines have a wasted spark on one plug of 2 firing at once from the same coil) Thus there is only one path for volts. All open gaps in the spark path are additive. Thus if the rotor gap (as below) was 1500 volt and the spark plug in fuel and air was 6000 volts, it would take 7500 volts to jump. If the leaking plug's fouling was draining at 1000 volts and going to ground, the total would be 2500 volts and never jump the real plug gap. If an added gap forces 7000 volts to jump it, the plug will now get a zap of that voltage plus the rotor gap 1500. 8500 volts now does jump the intended gap and the plug fires. Jim
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Today's Featured Article - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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