S2000 Turbo spark plug dilemma
01-28-2011, 11:28 AM
#12
Originally Posted by D1sclaimer,Jan 28 2011, 02:37 PM
In theory, this is true. Copper is less resistive than iridium and platinum.
Electrical Resistivity
copper: 16.78 nΩ·m
iridium: 47.1 nΩ·m
platinum: 105 nΩ·m
Sources
http://en.wikipedia.org/wiki/Copper
http://en.wikipedia.org/wiki/Iridium
http://en.wikipedia.org/wiki/Platinum
Although, I don't think its really a big deal. You can make nice power on any of them. I just use copper plugs because they're cheaper and I check them often and throw new ones in. Most use iridiums with great results.
Electrical Resistivity
copper: 16.78 nΩ·m
iridium: 47.1 nΩ·m
platinum: 105 nΩ·m
Sources
http://en.wikipedia.org/wiki/Copper
http://en.wikipedia.org/wiki/Iridium
http://en.wikipedia.org/wiki/Platinum
Although, I don't think its really a big deal. You can make nice power on any of them. I just use copper plugs because they're cheaper and I check them often and throw new ones in. Most use iridiums with great results.
01-28-2011, 01:09 PM
#13
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I have heard of several instances where an irridium spark plug disintigrated. A broken electrode inside your engine could very well spell disaster.
If you change them often enough, irridium is a waste of time and money anyhow. May as well run the stock plugs, (one step colder) or copper plugs.
01-29-2011, 05:51 AM
#14
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I stick with NGK coppers, I use R5671A-10 but you could use R5671A-8 for your power level. I make ~650 and do full track days with no issue. I stay away from the expensive BS plugs. I tune hundreds of cars a year and every spark plug related problem I've seen has been from iridium plugs.
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