Inside The No. 1 Qualifier
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The piston's ring pack consists of a Speed-Pro Hellfire 1/16-inch top ring that was ground down to 0.055 inch. Kaase explains, "It's normally used on nitrous engines and features a higher temperature resistant ductile iron so it doesn't relax when hot. And there is no moly on the face to shock off if the engine detonates." A Total Seal 0.043-inch cast-iron second scraper ring is a one-piece design, and the Speed-Pro 3/16-inch oil ring controls the crude. The top ring was treated to diamond lapping to get a mirror finish, and Calico coating was used on the piston skirts to thwart cylinder-wall scuffing. Compression height is 1.565- inches. View Related Article
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