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Platinum plugs work well on water cooled and newer vehicles with tight emissions controlled air fuel ratios. The advantage is they last longer because the platinum electrode does not wear out as fast as a standard plug. The disadvantage is platinum plugs don't have as wide a heat range as the spec'd Bosch or NGK copper plug. 911 air cooled motors with the wide temp ranges we run in, and the large variations in air fuel ratios and varying degrees of oil consumption, have an effect on fouling the plugs, causing misfires and/or incomplete combustion. The copper plugs have a wider heat range, so can burn off more of the residue over a greater temp range than the narrower window of a platinum plug. Keeping the plugs clean is key to consistent complete combustion and crisper response, which is why sometimes aftermarket systems such as MSDs contribute to better performance, such as with carbed performance motors.
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