In the time difference of 2.5 down to 1, that says something right there about the voltage in the spike. With the joule being VAT, if T shrinks by a factor of 2.5 then V or A....gotta be V cause the coil wouldn't let A change immediately, must have gone up 2.5x. What's the bandwidth of the vertical input of your scope? Possible that the spike jumped up there and the scope didn't catch it; maybe a little tweak of the V sink would have caught it.
I spent a lot of time in industry with pulse modulated circuits, high voltage, arcing, and all that and know that when you attempt to interrupt the current in an inductor, you had better do one of two things or both: limit the actual voltage with something like a zener diode or VDResistor, or limit the rate of rise to something less than what would produce the arc. The C is there to do that. Surprised you went through the range you did with no results. Course since you were increasing the C from what I learned was THE value, you already had the arc under control. Always heard that .01 was the value of caps used across breaker points. Don't know as I never measured one nor saw it stamped on the case.
I've been retired 10 years and forget and forgot a lot. I enjoy these brain tweaks as they keep what little brain I have left, active and I hear that helps to ward off Alzheimer's, speaking of which my lil'sis was here for a couple of days with her hubby who is in the preliminary stages. Really sad, sad, sad. He's just like a little kid. Drives her crazy but she has a good spirit and loves him. The visit did her good as she got to see her son home from overseas and his family plus a couple of weeks of breaking with the routine.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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