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Old 04-03-2007, 11:49 PM   #11
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Because they can't dissipate heat as effectively, and when they run hot, they lose a little material each time they spark, increasing the plug gap little by little.

Irridium isn't nearly as bad, but NGK still suggest selecting one heatrange colder than you would for copper in Forced Induction.

If you're stock Supercharged, go copper or irridium. But as soon as you start dropping pulley sizes, stick with copper.
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Old 04-03-2007, 11:59 PM   #12
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OH.. thanks... now i know... I appreciate it.
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Old 04-13-2007, 03:55 PM   #13
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OH OH,im in trouble.ive been running autolite double platinums in my car and no wonder its been rinning shity.i need to go buy some irridium plugs a.*.a.p.
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Old 04-13-2007, 04:17 PM   #14
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buy the irridium plugs NGK TR55-IX
i just changed my NGK irridium'* out at almost 101,000 miles on the old plugs.
great plug, i set the gap to .055 on the new plugs, the new plugs will probably
out live my car(engine) as i have over 145,000 miles on my car now.


taken from sparkplugs.con


Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200=F higher melting point than platinum and conducts electricity better. This makes it possible to create the finest wire center electrode ever. Prior till now, spark plug manufacturers have favored platinum for their long life or performance spark plugs due to its high melting point, also the technology did not exist to machine and bond iridium on a spark plug electrode (at least in a cost effective manner). Champion spark plugs have produced iridium industrial and aviation spark plugs since the 1960'*, but they still sell for over a hundred dollars per plug. Just now is the technology cost effective to use iridium in a spark plug for automotive applications. The strength, hardness and high melting point of iridium make it very well suited for a fine wire plug. The primary iridium plug manufacturers at this time are Denso with a 0.4mm center electrode, while Champion and NGK have 0.7mm center electrodes. These are the best performance plugs on the market for traditional automotive use and many racing applications. Autolite has introduced an iridium-enhanced plug (the iridium content is too low to call it an iridium plug) we do not consider this in the same class as Denso, NGK or Champion.
SIDENOTE: Thus far the tech'* we have spoken with report no problems using iridium plugs with Nitrous.
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