WRONG.... heat range is ONLY how hot the tip of the plug is and that is determined by the amount of metal the heat has to travell through to get to the head and transfer the heat to the head and disapate PEROID END OF STORY. GAP HAS NO BEARING ON HEAT RANGE
It's not the electrode that gets hot.. it's the ceramic at the base of the electrode... the size of this ceramic is based on said metal thickness Clayemore mentioned a few posts up.
the reason high CR or boost cars have colder temp plugs is coz this ceramic part glows red hot when too hot.. this will obviously cause pre-ignition combustion before the full piston stroke up is completed
And TODA/Adrian speaks truth... the denser the compressed mixture in the CC the harder it is to get spark to cross hence making the gap smaller or upgrading at least the coil. however i was lead to believe oem B series is 0.9mm gap for NA and was told to re-gap the factory produced NGK 1.1mm BKR series... i just left it and it's fine as you said.
this is why everyone says the coil upgrade is useless on a relatively stock car, it is unless you take advantage of it... and the only way to do so on a stockish car is to widen the gap on the plugs...
FYI to anyone interested.. the OEM coil was able to spark a 1.3mm iridium gap under various engine loads without detonating and response was still crisp.
Last edited by dsp26; 31-12-2007 at 03:37 PM.
Originally Posted by Slow96GSR
If 1 person has had bad luck with a product don’t condemn it until you yourself have tested it. Now if 10 pros have tried it and it sucked then I would trust their opinion.
Originally Posted by 1996ek1
Err i kind of thought the same as Luke, where the gap has something to do with the heatrange..
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