I will take issue with the spark at idle is harder to establish. There is compression at idle not vacuum . If you are at high RPM and then back off the throttle the engine very often does back fire proving your statement is correct about poor ionization in a vacuum. My field of working in power stations with high voltage switching equipment that has various ways for arc quenching has used that one.
The poor idle issues for most old tractors is with the magneto systems. A mag fires hotter(more voltage) as the rpm goes up. The only way to start with a mag is the impulse unit that speeds up the armature on the mag to get a spark hot enough for starting and low rpm. In the parades just about all the time one tractor starts missing with a fouled plug.
Also you are correct in your statement that dwell does not change , but I respectfully cannot agree that the difference of 600 to 2000 rpm take the same current.
(ie) dwell for chev 350 v8 is 28-32 degrees. That is with a gap of 17 thousand. If you have it at 30 degrees then open time is 15 degrees. Dwell angle for four cylinders are around to 60 degrees then the open is 30 degrees. If the points gap is smaller the dwell angle is higher as in our old tractors.
anyway I am of to pick up a 300U, good metal and tires and is supposed to run well. The wife said she would drive it in the parade of power if we get it fixed up.
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