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Spark Plugs: Fact and Fiction
Once the domain of weird surface-gap plugs, some Top Fuel dragsters have switched to a Champion plug with a broad projected nose, reduced-diameter center electrode, and ultra-thick cut-back ground electrode (right, compared to the street version, left). Today’s Fuelers need a deeper spark projection to light off the immense fuel volume passing into the chamber—volumes that also cool the plug sufficiently to (usually) ensure its survival. View Related Article
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