Re: Spark plug wires

Posted by Janicholson on February 25, 2022 at 09:29:53 from (199.17.6.141):

In Reply to: Re: Spark plug wires posted by sotxbill on February 25, 2022 at 07:39:05:

On the right track here. The total resistance seen by the coil secondary includes internal coil winding resistance, the coil wire resistance, The carbon button in the cap to rotor connection pivot, the gap between the rotor and the individual plug wire posts inside the cap, the individual plug wires, and finally the ground across the spark gap at the plugs. Coils fire when the voltage reaches the breakdown voltage of this string of resistances. If resistor plugs are also used that is also added. Plug wires are of three basic configurations of conductor. Carbon impregnated fiber glass, or Kevlar core resistor wires (about 7 to 10 thousand ohms per foot of wire) Stranded wire core wires. Some are tinned copper, some are steel with copper coating. (near zero ohms per foot resistance.) The third is spiral wound wire conductor on kevlar fibers. This more expensive wire has a few ohms of resistance, but is engineered to suppress radio frequency emissions by being unable to create an antenna for the radiation of Electromagnetic waves.
The reputation for carbon wires being bad comes from the initial 15 years of their use, during which the technology was not mature and they failed often. Vibration and heat made them fail, becoming a continuous service issue on tuneups, and misfiring.
Today they are far more reliable and still used in many vehicles. They are now OK to use especially where the tractor is easy to start. (not an M Farmall on 6v)
Solid core wires are certainly Ok to use, but do generate radio static and EMF in the wires that can cause electronic ignition to fail, and static in home radios and (on the air) devices. I do not recommend them.
Wire wound suppressor wires are my choice, and can be used in all vehicles. A bit more cost, solid connectivity, and no radio noise.
I stand on these issues as stated. Jim

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