Travis Munday
Well-Known Member
Iridium plugs are usually much better then platinum in boosted engines because of the high heat levels they produce. While an engine, espically a supercharged one, may not reach the melting point of platinum, the properties of a metal changes with heat, and as a metal gets hotter, it becomes more resistive. Simply, the hotter a metal, the worse it carries an electric charge. If you've got a metal, like iridium, that is about half as resistive as platinum, then even at the high temperatures of combustion, the resistivity of the electrodes of the sparkplug will still be the same, if not lower, then a platinum plug at room temperature. And Baron, you're right for wanting to go with a cooler plug, again because of the higher combustion temperatures, it's important to keep the tip of the plug as cool as you can. They are only "gimicks" if you don't understand the physics, or the physics don't add up, which in the case, the physics are there.
NGK makes iridium plug, usually cheaper then Denso, may want to check those out too.
NGK makes iridium plug, usually cheaper then Denso, may want to check those out too.
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