Posted by LJD on December 10, 2011 at 05:44:17 from (67.142.130.17):
In Reply to: Magneto question posted by Machine249 on December 09, 2011 at 17:27:55:
It takes an extra 2000 volts to jump across the rotor to the pole inside the cap if it's new and clean. So if the spark is not as strong as it should be, you can get it out of the coil but not through the cap.
Easy test is to get a big spark plug and break the ground electrode off of it. This way the spark has to jump a 1/4" gap. If that works from coil with a 1/4" blue spark, you know you have enough to got through the cap.
A clean plug gapped at .025" takes around 8,000 volts to fire. If run through a distributor cap and rotor it takes 10,000-11,000 volts.
Gap a plug at 1/4" and it will take 20,000 volts which any good battery coil can make.
Also, points timing must be correct. If you points cause spark when the rotor is inbetween distributor poles, you can lose spark. If points are timed right, the rotor will point at a pole when spark occurs.
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