Quote:
Originally Posted by turbociv910
Engines get better gas mileage and less emissions the hotter they are, that is why most cars have an operating temp of 200-220. Some iron blocks are 230!. Iridium increases heat increasing fuel mileage. Hotter everything is, the air the engine is consuming is less dense(= less fuel). Just like when its cold you expect more power right?
Copper runs cooler, has colder spark(naturally) to reduce detonation for higher horsepower and aftermarket applications. Many, countless times have i taken out iridium plugs in exchange for copper and gained power, or got rid of a miss fire.
never buy "iridium racing" plugs for your car, you will waste the $$ and i will say i told you so.
downside is that a copper plug wears out twice as fast, but who cares when they cost $3 a piece.
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Had misfire with my .30 Iridiums. Swapped to cheap copper and .25 gap and misfire disappeared.
Going to dyno with Iridiums and then switch to copper to see a difference.