Nitrous: Fuel for the Greedy
During the test we ran Autolite 3923 copper resistor plugs, which are one stage colder than the 3924s we normally use in naturally aspirated engines. The colder the plug, the more it resists heat buildup at the tip of the electrode, thus decreasing the chance of detonation in a nitrous or supercharged application. The projected tip design of these plugs, which aids fuel efficiency, often causes problems with nitrous because the relatively long electrode hangs out into the chamber and has a tendency to act like a glow plug. Close inspection revealed a bluish tint on the tip of the 3923s--anindication that we needed an even colder plug, like a 3922. View Related Article
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