I don't have any articles (on hand that I have saved) but based soley on my experience and literature Ive ran across over the years, I believe its less critical on a battery powered coil ignition (as to the use of wire core versus higher resistance carbon core wires) then it is on a generally lower energy magneto ignition. I read somewhere that in general, based on RPM and magnetic field strength of the rotor, and based on the impedance of the load into which the mags output is connected, ITS BEST IF THE LOAD (part of which is the plug wires) IS LOWER IMPEDANCE and wire is less impedance then carbon.
Subject to RPM and magnetic field strength (on a mag) its my understanding in general a typical old tractor mag produces less energy then a battery powered old tractor ignition and since plug wire current yields I Squared R heat energy losses its NOT good to waste any limited precious spark energy in the wires but best to discharge it all across the plug gap.
If the energy is limited to begin with, and the mag is less energy then a battery ignition, why waste any in the form of I Squared R heat loss in higher resistance plug wires??????????
NOTE I know Ive read this before and didn't dream it lol but its my belief wire core wire is best to use on a Magneto (because energy is limited so why waste any in the wires), although sure, either will still work well duhhhhhhh but I just dont have any hard core research or articles Ive saved to cite to back that up
That's my story n Ima stickin to it for now at least lol but Ive been wrong before you know
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