| "Copper is a better conductor of heat and electricity than platinum. The thermal conductivity for copper is 401 k (W/k-m), compared to only 71.6 for platinum! Quite a difference. Electrical conductivity shows similar results (I think copper is around 4-6 times more conductive electrically). This means that the spark will not "blow out" as easily under high boost. It also means that copper plugs will cool off faster than platinums (but you can run colder plats so this is probably not as great a benefit as the first point)." I don't care to check the numbers right now, but that was one of the most basic reasons I read when i made the switch years ago. It goes with my own personal experience, so there should be at least a little truth to it: I noticed that I can gap my coppers with a slightly larger gap than I could with platinums, since I converted to a coil on plug setup on my car (non-Z, so of course your car may vary). But again, after I switched I realized *my* main benefit was that it forced me to look over the car more during a routine oil change.
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