spark plug wires

[John MacDonald]

Has anyone else used Speedways red 7mm solid core wire set(#91064235). I have them on my 239 flathead and not sure iI like them, have developed a miss somewhere, could be cap, rotor or spark plug wires, if you use them let me know how you like them, wire seems awful thin. Johna

 

[38bill]

Running a sim wire on my 59AB. No problems with the wire but with the Rajah plug terminals I'm using its hard to get a good connection.

 

[John MacDonald]

my thinking exactly

 

[Flathead Fever]

Has anyone else used Speedways red 7mm solid core wire set(#91064235). I have them on my 239 flathead and not sure iI like them, have developed a miss somewhere, could be cap, rotor or spark plug wires, if you use them let me know how you like them, wire seems awful thin. Johna

If the misfire is at idle and you suspect something is wrong with one cylinder like a wire, plug, compression, burned valve... remove the plug wires from all of the plugs and just sit them back on but don't snap them on all of the way Then start it up and with the best insulated pilers you have lift them off of the plugs one at a time. If the rpm drops that cylinder is firing, if it doesn't drop its not. This is a poor man's cylinder defeat test. The ignition scopes had a cylinder defeat test that let you push buttons and cancel out the cylinders one at a time to see which cylinders were providing power and which ones were not. At home you can do the same thing by pulling plug wires one at time. Do not pull plug wires off an engine with electronic ignition. The coil will try to develop whatever voltage it takes to jump the gap. When it can't jump that wide gap, it will look for another path to ground and it can find it through the electronic control module and damage the circuits and transistors.