Spark Plug Wires: 8mm vs. 10mm when and why? - Ford Mustang Forums : Mustang Forum
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post #1 of 2 Old 01-21-2007, 08:27 PM Thread Starter
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Question Spark Plug Wires: 8mm vs. 10mm when and why?

Whats the big difference between 8mm and 10mm spark plug wires? when is a 10mm wire better and why?
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post #2 of 2 Old 01-21-2007, 08:53 PM
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2mm of insulation.

Why, to prevent spark leak and allow a wider gap to the plugs without having it arc through the wire, with higher voltage ignition systems.

Example/case in point, near 18-1 compression, msd 7al3 and pro-power coil, is a 55,000 volt system. Spark was collapsing/blowing out with gaps larger than .030 peak performance was attained with .026" gap. Lessor wire could/would have allowed the spark to arc and not even allow the .026" gap....
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