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Message: <blockquote data-quote="Daniel" data-source="post: 177187" data-attributes="member: 1260">Let me include further info on this plug gaping topic: The simplest way to do it is to buy a gapping tool (usually a disc) with many different sizes that you slide between the electrode and cathode. I think if you wanted to gap them larger then sliding a larger spacer in would stretch it properly to size, and if you wanted smaller then squeezing the electrode down onto the properly sized disc would result in the desired gap. If the gap is too big you get what's called flame out. That's when you don't make a good spark at high rpm because your coils and wires see to much inductance and the voltage drops. The larger the gap means the more voltage it takes to cross it. If you run a smaller gap you can go to higher RPM without changing coils or wires. However you need a good spark to create good ignition. So the idea is to find a gap that combusts all the fuel and still works at the redline. Old plugs usually feel shitty because of the gap. You'd be surprised how nice your car would run by just adjusting your gap.Back to the iridiums, be careful if you adjust them. Try not to touch the centre electrode at all. Mine were perfectly gapped out of the package. Iridium is very hard and doesn't melt like the old copper plugs did. The idea is that they require less servicing and because they are pointy they require less voltage to cross the gap. I won't get into the physics of it but trust me it works. This link may help with deeper info on denso plugs: <a href="http://www.densoiridium.com/index.php" target="_blank">http://www.densoiridium.com/index.php</a></blockquote>

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