Janicholson said: (quoted from post at 21:47:32 01/18/09) 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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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