Posted by JMOR on July 02, 2015 at 22:56:11 from (72.181.168.203):
In Reply to: positive ground posted by bruce from Can. on July 02, 2015 at 19:01:15:
ShadetreeRet said: (quoted from post at 00:23:09 07/03/15) John T. It has always been my understanding also, that if you connect a coil with polarity reversed, it will cause the points to burn faster. Never went to the trouble to research this theory, I just connect them as per instructions, because electricity and automotive electricity in particular drive me nuts anyway.
It does not matter. As Bob said, every other spark in a magneto is of opposite polarity, & with today's modern "wasted spark" ignition systems & all the old H-D cycles you had a mix of spark polarities. This topic is useful only to excite discussion, that is about it! Take a given coil & engine, wire it one way and get the negative spark polarity on the center electrode that all want for the "thermionic emission" reason, or wire it such that you get a positive spark and a higher voltage (by maybe 200v out of thousands).....what do you want? Doesn't matter! By the way B&D's idea that it matters in a cold weather start holds no water or ice, as thermionic emission won't come into play until the electrode is hotter than Hades!
Oh, & I shouldn't forget to address "energy". Energy in an inductor (coil) is inductance times current squared divided by 2. Guess what? The current is the same, no matter which direction that it flows. Therefore energy = energy, regardless of connections.
This post was edited by JMOR at 23:14:06 07/02/15.
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