Platinum tipped center and ground electrode
Platinum fine wire center electrode
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Autolite uses platinum in both their long life automotive and powersport performance plugs. This is because of platinums high melting point which makes it useful in two ways. On a long life spark plug a thin wafer of platinum is bonded at the firing point to the center electrode (and possibly ground electrode) solely so they don't wear as fast as a traditional plug. On a fine wire performance plug, the very tip of the center electrode is made of platinum so that the fine wire tip will last longer. (By the way, it is still not suggested that platinum plugs be used on vehicles with nitrous injection.) |
