Thread: New Spark plugs, New car!
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Old Mar 4, 2010 | 04:05 PM
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onehundred80
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From: Ontario
Default Re: New Spark plugs, New car!
Originally Posted by Skyshadow
You dont have to gap iridium plugs.
Thats not what NGK says;
3. Gapping
Since the gap size has a direct affect on the spark plug's tip temperature
and on the voltage necessary to ionize (light) the air/fuel mixture, careful attention is required. While it is a popular misconception that plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings (to ensure ignitability
in these denser air/fuel mixtures). As a rule, the more power you are making, the smaller the gap you will need.
 
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