Well while waiting for John T to get on and answer, I will make a feeble attempt. On a coil/bat ignition system,I don't think it makes a diff as long as they are in good condition,in other words compare new to new. Now on a magneto ignition , which is probably what the posts you are referring to are talking about , there is no external power source feeding the coil and magnets have a finite amount of power that cannot ramp up just because a resistance is sensed as the other can. Therefore , any resistance between the mag and plug (including the plug itself) will affect the power to make spark. A coil/bat system has plenty of reserve and way more power than it needs to overcome resistance and actually make a hotter spark because of it. Not so with a magneto on the old tractors. A magneto on a nitro burning dragster was designed to fire a mixture of "syrup" and alcahol under extreme pressure conditions but these old tractor mags don't need and don't like resistance. I'm sure John "T" will chime in with the real answer.
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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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