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Upgrade your Harley-Davidson Big Twin engine with the HASTINGS piston rings designed for optimal performance and durability. This set includes top compression rings, second compression rings, and oil control rings, all engineered to meet the demanding conditions of motorcycle engines. The top compression rings feature a barrel face that enhances heat transfer between the piston and cylinder wall, promoting efficient cooling and preventing overheating during operation. They also effectively control combustion gases, ensuring maximum energy transfer from the expanding gases to the crankshaft for smooth power delivery. The second compression rings utilize a reverse torsional taper face, which promotes side sealing and reduces oil consumption by preventing oil from being forced under or behind the ring. This design, combined with a taper-machined face, mimics the scraping edge of positive twist torsional rings, improving overall sealing and performance. The oil control rings are constructed as a three-piece flex vent design, allowing the rails to conform closely to the bore for superior oil regulation. The four steel rails and two expanders work together to provide consistent pressure, ensuring a uniform oil film and preventing excess oil from entering the combustion chamber. Made in the USA, these rings are compatible with pistons requiring special attention to the top ring end gap due to HD engine thermal characteristics. The set provides enough rings for two pistons, with two rings per groove, except the rails which include two rail rings per one expander ring, ensuring proper installation and optimal engine operation. Designed for engines with a bore size of 3.437 inches and a piston height of 0.050 inches, these piston rings are essential components for maintaining engine integrity, improving efficiency, and extending the lifespan of your Harley-Davidson Big Twin engine.
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