Iridium spark plugs
02-25-2002, 03:25 PM
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Iridium spark plugs
I was at the HKS site looking at their exhaust and I stumbled upon iridium spark plugs and it indicated that there are different heat ranges for our vehicles. Can someone explain?
02-25-2002, 11:17 PM
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Denso makes iridium plugs for our cars. IK16 is the part # in our standard heat range. IK20 is a "colder" plug.
The IK16 is for stock or lightly modified motors (I/H/E is lightly modified btw).
Use the colder plug for heavily modified (I/H/E + ported, cammed etc) or nitrous/sc/turbo applications where detonation might be a problem.
On a TLS with I/H/E + maybe a ECU timing mod, I would go with the 20s because of the higher compression in the S engine.
NGK now makes iridium plugs for our engines now, but I'm not sure of the correct part #s.
The IK16 is for stock or lightly modified motors (I/H/E is lightly modified btw).
Use the colder plug for heavily modified (I/H/E + ported, cammed etc) or nitrous/sc/turbo applications where detonation might be a problem.
On a TLS with I/H/E + maybe a ECU timing mod, I would go with the 20s because of the higher compression in the S engine.
NGK now makes iridium plugs for our engines now, but I'm not sure of the correct part #s.
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