More Plug Info
Here's some info from the Champion site about the proejcted core nose:
Projected Nose "Y" Gap
This gap style projects the spark an additional .060" into the combustion chamber for a total projection of .210", and providing there is sufficient clearance to valves and pistons, provides the ultimate in performance. Initiating the flame front closer to the center of the combustion chamber has a similar effect to advancing the timing. Therefore, maximum timing may be reduced which helps reduce the chance of detonation and provides superior part throttle response. A second valuable feature of this style is a "broader" heat range. The core nose is longer, providing a "hotter" plug at low speed which helps prevent fouling. As engine speed increases, the incoming air/fuel mixture flows across the tip of the core nose, providing charge cooling which effectively reduces heat range at higher engine speeds for increased pre-ignition and detonation protection.
---and btw, I checked a few plug sites and they all list the 7440 as a premium plug for the Cruiser.
pingber
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