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Re: Spark Plug Wires and magnetos


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Posted by John T on June 28, 2013 at 06:12:41 from (216.249.76.176):

In Reply to: Spark Plug Wires and magnetos posted by bjb in Tx from Ne on June 28, 2013 at 05:35:23:

Okay, heres my oldddddddddd Electrical Engineers take on your question, but mind you Im rusty as an old nail especially in areas other then AC Power Distribution where I practiced in my later years... Lawyers love disclaimers lol... Hope Professor Jim and Bob and other more current and knowledgeable electrical minded sparkies can weigh in here (but lay person Billy Bobs are sure welcome also, were never too old to learn I figure), I may be all wet, it wont be the first time grrrrrrrrrrrrrrrrr


"1. Am I damaging the WC's mag with the carbon wires?"

I wouldnt say your mag is gonna crash n burn due to carbon wire use, only that it may be working a bit harder (maybe running just a tad hotter and less efficient) and when the coils stored energy is dissipated youre expending a part of that finite energy as wasted I Squared R heat energy in those resisitve plug wires versus across the plugs gap which ignites the fuel. Its the sudden release of energy and heat when the arc occures across the plugs gap that ignites the fuel, why release any of that limited energy in the resistive wires????

2. Why are carbon core wires bad for magnetos (technical explanation please)?

Pretty much same as above, the mag was designed so the energy stored in the coil was to be discharged n dissipated across the plugs gap and the impedance into which the HV secondary is looking was originally very low (if steel or copper plug wires were used) other then the open gaps (until she arcs current), of course. Once the plug gap arc occurs and current begins to flow, if the wires are resistive that reduces current flow and wastes energy in the form of I Squared R Heat ID PREFER IT ALL BE DISSIPATED ACROSS THE PLUGS GAP NOT IN THE RESISTIVE WIRES

In summary, far as I know the mag was designed to be looking into a lower impedance (steel or copper wires) then that presented by resistive wires and its my old rusty engineers opinion the mag will run a tad hotter and be less efficient if resistive plug wires are used and I know FOR SURE sure any heat energy expended (I Squared R) in the resistive wires reduces that which would otherwise get expended across the plugs arc.

So until proven otherwise, Thats my story n Ima stickin to it lol

Ol John T and all Lookin forward to other informed opinions and info God Bless yall


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