On the too big part, reason is the capacitor keeps the coil current flowing so there is no big interruption like from 5 amps to 0 and V = L di/dt so with a low value of di, the voltage developed across the coil secondary (aka transformer) will be too low....needed about 18kv for a good spark in the old days.
On too small, it doesn't limit the rate of rise and absolute value of the voltage across the points to a value below the arcing onset and arcing occurs, not quite as much as no cap. but arcs none the less.
And folks, "That's the rest of the story".....Paul Harvey.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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