Join Date: Jul 2006
Location: Northfield, Illinois
If the center insulator has loosened, it's from detonation. That can be related to plug heat range, lean mixture or other ignition causes. NGK's often have a wider heat range tolerance. I use them on old Ferrari V-12's that like to oil and fuel foul plugs at driving around town engine speeds. They are not too hot at highway speeds, and resist oil and rick mix at low speeds. I dont know is 8's are hotter or cooler than 7's with NGK, I just look at the internet heat range charts when needed.
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Illinois SNO Alfa Chapter Director
Illinois SNO Ferrari Chapter Director
and sometimes, CONFUSED AND INCORRECT, but Larry helps me out.
Illinois Chapter Director AND Charter Member of THE CONFUSED AND INCORRECT