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Discussion Starter #1 (Edited)
Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200 degree higher melting point than platinum and conducts electricity better. This makes it possible to create the finest wire center electrode ever. (See "What is a fine wire plug" for information on the benefits of fine wire plugs)

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's, 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.

SIDENOTE: Thus far the tech's we have spoken with report no problems using iridium plugs with Nitrous.
 

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sparkplugs.com said:
Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200 degree higher melting point than platinum and conducts electricity better. This makes it possible to create the finest wire center electrode ever. (See "What is a fine wire plug" for information on the benefits of fine wire plugs)

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's, 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.

SIDENOTE: Thus far the tech's we have spoken with report no problems using iridium plugs with Nitrous.
I have used the NGK brand iridium plugs for 11k. mi. on the stock setup. and 3k. mi. on the 50trm (same set), and have had no problems. I checked them last evening for pm. And they show normal signs of wear.
 
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