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View Full Version : Spark plugs - copper core



Walrus
03-14-2008, 06:48 AM
Who all is running regular copper core plugs in there 3? I just installed Autolite 104 plugs last night.

Why? Copper is a better conductor than platinum or iridium.

Then why do they make platinum/iridium plugs? They last longer, so you don't have to change them as often. This is good for vehicles with hard to get at plugs - the 2001 Xterra I had, the sixth plug is rediculus to get to. But with the 3, they are so easy to change, I plan on changing them more often, only $15 each time.

Too bad you MS3 guys can't find a copper plug. Turbo engines don't like fancy plugs - the plating starts cracking. I had a Merkur XR4Ti and I was running 18psi boost, and would only run properly on regular copper plugs.

Skarbro
03-14-2008, 08:27 AM
I would like to hear about how your car is running after a few months. Personally, I stick to OEM plugs because many aftermarket plugs give problems to FI engines.

midnightfxgt
03-14-2008, 11:01 AM
Iriduim plugs are a better plug. The resist corrosion, draw less power, and are more anti-fouling. For the amount of extra shelf life, I personally think they are the way to go.

For us with boost, stick with a copper core. :)

-John