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iridiums

Ilier32

By Ilier32,
in General Maintenance

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Zahos Mentor

Zahos

Posted
Posted

copper is a better conductor, but thermally breaks down quicker.

If your car is a street car, dont waste ur money on iridiums, coppers changed every 15,000Km is much better... I don't know anyone that has kept platinum/iridium plugs on a high performance car for 100,000km.

If you race on a cuircut, then iridiums are better as they can take the abuse from the high temps...

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mad34 Experienced

mad34

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i had some problems with iridiums at the start missfiring after 4000. then the problem seemed to go away when i gapped them to .6. still happened every now and then. i would go the copper ngk thats what i swapped to and since have had no probs.

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Pablo Enthusiast

Pablo

Posted
Posted

B/S???

Iridiums will last 100,000 km's on a stock car....

As for copper - this is from Unique Autosports Dyno web page:

"Both of these items often pay for themselves by providing better power and economy. Iridium spark plugs often make more power than copper or platinum even if they are in good condition, especially at higher than standard boost levels."

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Ionos Community Regular

Ionos

Posted
Posted
This Table  shows the conductivity of several metals.

Copper is clearly a better conductor.

Iridium has better corrosion resistance, thus lasts longer.

choose the plug that best suits your needs. If you cant be f*cked changing plugs every 15K - 20K km, then get iridiums.

That table shows thermal conductivity. Not electrical conductivity. 2 different things.

That said, I dont know whether copper or iridium is the better electrical conductor.

Also, AFAIK the iridiums used in skylines are have 0.6mm tips, which only has a 60000km life, not 100000km.

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Zahos Mentor

Zahos

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Cheers.

Hmm Copper a better conductor then gold?? I thought gold was a better conductor.

What's the point of gold plated ends on audio cables etc? Wank?

Pure copper is better, but I dont believe spark plugs are pure copper otherwise I think it will be too malleable, and would corrode quickly.

I think they add other metals to make it more durable, but I might be wrong...

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nF Collaborator

nF

Posted
Posted

I've got iridiums left at stock gap of 1.1mm.

I got plenty of missing at 12psi. I taped up the coilpacks and it disappeared.

Came back when the weather got colder (oh and i happened to up the boost to 1bar), so i bought some splifires and problem solvered.

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