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The HASTINGS Evolution Big Twin piston rings, part number 2M6164020, are designed for optimal performance and durability in high-performance engine applications. These rings include top compression rings, second compression rings, and oil control rings, providing a comprehensive solution for piston sealing and heat transfer. The top compression rings feature a barrel face design, which enhances heat transfer between the piston and cylinder wall, aiding in effective cooling and preventing piston overheating. They also control combustion chamber gases efficiently, transferring the energy from expanding gases to the crankshaft for smooth power delivery. The second compression rings utilize a reverse torsional taper face, promoting superior side sealing that prevents oil from escaping beneath the rings. This design contributes to improved oil economy and reduces oil consumption, ensuring cleaner engine operation. The oil control rings consist of a three-piece flex vent design, allowing for better conformity to bore irregularities due to their small cross-sectional rails. This configuration maintains uniform pressure via four steel rails and two expanders, providing reliable oil control and minimizing oil consumption. Crafted in the USA, these rings are compatible with piston assemblies requiring a 3.498-inch diameter and a .020-inch ring gap. Special attention should be paid to the top ring end gap during installation, especially considering the thermal conductivity and design of KB pistons. The package includes enough rings for two pistons, with two rings per groove, except for the rails which are paired with a single expander ring. These piston rings are ideal for those seeking to restore or enhance engine performance in Big Twin motorcycles or similar engines, ensuring longevity and efficient operation in demanding conditions.
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