Is there an advantage of using NGK Iridium plugs over the NGK V-Power or platinum in a motor that has no mods? Are they worth they extra $5 a plug?
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Spark plugs type
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Oil in spark plug tubes does not go into combustion chamber until you remove that plug without cleaning that oil in the tube.
Term "oil fouling" is used to describe the condition of firing end of a spark plug. Not on the out side, like spark plug tubes.
If the oil in the tube cause a spark plug to misfire and oil foul, that oil leak shall be repaired regardless. That is a different issue.
If you have good plug wire, oil in the tube does not affect all that much to the performance of that plug. I had such leak on a Civic, and it never missed a beat. No fouling, even with regular spark plugs.
I had regular NGK plugs prior to iridium plugs on my Accord LX. #3 always "oil fouled" due to worn rings and/or barrel. Now, with iridium plugs, #3 does not foul at all. Nothing else is changed. No oil in the tubes, by the way. This is why I say, iridium plugs work better in "oil fouling condition".
I didn't say, iridium plugs do not foul.
It is common and accepted knowledge in my industry that the iridium plugs holds better from fouling compared with regular plugs.
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This is what I found on the net what others are saying about benefit of iridium plugs.
http://www.ngk-sparkplugs.jp/english...1_1/index.html
http://spark-plugs.co.uk/index.php/c...ntents.iridium
http://www.densoiridium.com/faq.php
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"Fouling" described.
http://www.ngksparkplugs.com/techinf...200&country=USLast edited by oyajicool; 06-15-2013, 10:45 PM.A&P-IA
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