Quote:
Originally Posted by R1ffR4ff
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The guy who wrote the article is a bit suspect on electrical knowledge, he states that iridium has higher electrical resistance than copper and will degrade performance, the spark is high voltage low current, so a few extra ohms is neither here or there. Copper core is used for cooling / good heat transfer away from tip into body of plug, not electrical conductivity, otherwise why would plug maker fit a resistor into plug body - iridium plugs still have copper alloy core with iridium tip laser welded onto end to resist spark erosion.