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ARP Ultra Torque Assy Lube, 1.69 oz tube
Following years of extensive R&D, the engineering team at ARP® has developed a revolutionary new high performance fastener assembly lubricant that is superior to commonly used oil, moly and other lubes. ARP Ultra-Torque® allows builders to torque fasteners within 5% of their required preload on the first “pull,” virtually eliminating “preload scatter,” and ensures exacting fastener-to-fastener preload consistency.
Because of frictional inconsistencies with oil, moly, and other lubricants it takes multiple cycles of torquing the bolt, loosening it, and tightening it again to obtain the required preload or stretch. Typically, when a fastener is first tightened, friction is at its highest point and the preload value or stretch is low. As the fastener is cycled numerous times the friction decreases and the preload increases. This phenomenon is called “preload scatter.” Extensive testing has shown preload scatter to be as much as 20-40% on a new fastener, depending on the lubricant used. With ARP Ultra-Torque®, a fastener need only be torqued once to get within 5% of ideal preload—and remains consistent through all subsequent cycles (from race-prep machining through final assembly and subsequent rebuilds).
Moreover, given the inconsistencies of ordinary lubes, it is quite possible for adjacent head bolts or studs to have vastly different preloads. This “scatter” causes bore distortion, hampers piston ring seal, and leads to poor head gasket sealing. Preload differences in connecting rods and main caps can cause uneven bearing loading. It’s easy to see how ARP Ultra-Torque® can actually help you build a more powerful, reliable engine!
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