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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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