Blue spark plug wires11/21/2023 I think I will use them instead of the "Blue Streak" set. Seems like the local auto store wires (older set) has less of a spread, and they are all much closer together for resistance. Plug Wire 29" = 9.46 Kohms (326 ohms / inch) Plug Wire 27" = 9.16 Kohms (339 ohms / inch) Plug Wire 27" = 8.6 Kohms (318 ohms / inch) ![]() Plug Wire 23" = 7.7 Kohms (334 ohms / inch) Plug Wire 30" = 6.03 Kohms (201 ohms / inch) Plug Wire 28" = 1.18 Kohms (42 ohms / inch) The other thing that bothers me, is the "Blue Streak" wires are supposed to be the better ones, with 8.5mm cores, but their boots for the plugs don't even fit the factory heat shields:Ĭan't you tabulate your results in Ohms/inch?ĭistributor Wire, 16" = 230 ohms (14.4 ohms / inch) are the resistance values of the plug wires really that critical? The plug wire and the core resistance of the plug will add together, so they can really be considered one load. The built in resistance of the plug electrode and the wires, then, is to keep the current low enough, that it doesn't burn up the coil. I know that the plug is the highest resistance element in the ignition system (gap, not the core), and this is why you need a coil to up the voltage to a level that will jump the gap on the plug, so that resistance is very high (100's of mega-ohms) until the gap is bridged and then it drops to almost zero. Now these seems to be grouped a little better and within a 10 or 20% tolerance, like most resistor type electrical elements. As a comparison, I measured another set of wires I got a few years ago, that were sitting on the shelf: To me, it seems that a few of them (28 and 30) seem to be a little out of the expected range tolerance for resistance, but since I don't measure plug wires every time I get a chance, maybe this is normal. I wanted to make sure the wires were sound, so I took a multimeter and checked them. They are "Blue Streak" brand plug wires, and what I am finding disturbs me. I know some of you will tell me that you get what you pay for, but I honestly don't remember how much I paid for them. I purchased some from Rock Auto, and I am beginning to think that they are not any good. So this weekend I started on the spark plugs and the plug wires. But while things are still accessible, I am using this opportunity to replace things that would be otherwise difficult to replace. ![]() I have been working on replacing the clutch on my 87 GT for some time (it has been one issue after another, you can read this thread if your interested 87 GT Clutch Issue ). I have well grounded (pun intended ) understanding of electrical theory, electronics, etc. I have a question concerning plug wires in general.
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