Posted by Texasmark on May 02, 2023 at 07:25:35 from (147.160.221.188):
In Reply to: Re: Oliver 1850 posted by showcrop on May 01, 2023 at 04:08:01:
Been 18 years since I retired but here goes:
Permeability of the coil's core is temperature sensitive and decreases with temperature meaning that the inductance, hence amount of energy it can store to dump into the spark plugs, diminishes. Allowing the coil to cool temporarily shrinks the conductors, opening the short and reverses the loss. I never have researched the exact mechanism within the coil that produces the heat that wasn't produced when it was new. Possibly shorted turns (insulating varnish encircling the wires which has worn off due to operational effects might be the answer since heat makes copper expand and when it cools it shrinks back and opens the short.
The coil has a volt per turn value based on the design/circuit parameters. If one turn does not produce it's required voltage the coil essentially pumps all its energy, dissipating heat, heating the core, into that turn to bring it up to the required value and that could be the reason the coil fails when it gets hot.
The condenser (capacitor) is made up of layers of conductor and insulator and probably aluminum foil and oil soaked paper or plastic. My experience with these components is that once they short they shorted and its not recoverable due to the nature of the material that is burnt during the short that remains in place.
I too have had coils fail as yours probably has on some of my gasoline engines over the years.
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