Whew, That mag is decidedly bizarre inside. My thoughts were just to get an operational spark, but I guess not on that unit. As to the polarity of spark. I agree the only small advantage to a center to ground spark is the thermionic effect of a hotter point of origin. The plasma between the electrodes just needs to start a good fire. Several years ago an extreme test was made with consumable electrode high current Capacitive discharge. (I have no idea where it was published) This experiment used currents of 20 to 100 times those found in normal spark ignitions. It actually produced a flash of superheated gas into the chamber (test cylinder) that produced a significant improvement in combustion rate and flame travel due to a larger flash origin for ignition. The peak mean effective pressure was greater, and power was incrementally increased. It was determined that the cost of consumable electrodes, and the complexity coupled with metal being "eroded" off of the tips, was not a viable solution. CDI and other hot spark electronic igniters and coils pumping into wider spark gaps (some at .080") are a reflection of the value of the idea. Exotic metals and heat control are also in the same realm of applied science. Fun discussion. His rebuilt mag looks great. I hope it performs. JimN
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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