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Username Post: A education on Spark Plugs
Senior Member
Posts: 9664
Loc: Plano, TX
Reg: 08-28-03
02-20-12 10:03 AM - Post#2192906    
    In response to technitom

Precious metal electrodes (iridium and platinum) last longer, so will maintain the proper gap for a much longer time. They have allowed new car mfrs to extend plug change recommendations to 100K miles. If platinum-tipped plugs cured a fouling problem, it's probably because they were a slightly hotter heat range.

I'm not sure what, if anything, copper core and Rapid Fire plugs do that other plugs can't. I guess a copper core could reduce resistance, allowing more spark current, but who knows if the performance increase is even measurable?

1982 C-10 SWB pickup -- Unmolested, original paint.
350 with Vortec heads & RamJet roller cam, along with TH350 replacing 250 six and 3-speed manual.
Sold my 55 sedan in 2014, after having owned it 11 years.

Edited by MikeB on 02-20-12 10:05 AM. Reason for edit: No reason given.
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