Quote:
Originally Posted by Flathead Fever
They no longer recommend running plug wires up against each other because the magnetic field from one plug wire can actually create spark in the wire running along side of it. You can take a plug wire that is not connected at either end and lay it along side a firing plug wire and it will create a spark in the plug wire that's just laying there. It would only be a problem if the parallel wire is next in the firing order. Like a Ford FE big block. The last two cylinders in the firing order were 7 and 8. So, when 7 is firing 8 has just filled the cylinder with fresh fuel/air because it's at the bottom of the intake stroke. This could cause engine knock if 7 induced current into the number 8 wire and ignited the air/fuel mixture early. It was easy to have this happen too because cylinders 7 and 8 are right next to each other. The fix is to keep them as far apart as possible, or cross them at 90 degrees.
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I was going to say something similar but didn't want to be the party
pooper. The other no-no is having all the secondary wires in a metal
tube, à la Porsche. Never a good idea.