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Upgrade your engine's performance with the HASTINGS Piston Rings model 2M4941005, designed specifically for 3.875-inch bore Twin Cam engines. This set includes top compression rings, second compression rings, and oil control rings, providing a comprehensive solution for optimal piston function. The top compression rings feature a barrel face that enhances heat transfer between the piston and cylinder wall, which is essential for maintaining engine temperature and efficiency. They also help control combustion chamber gases, enabling the piston to transfer the energy from expanding gases to the crankshaft effectively. The second compression rings are Napier style with a reverse twist, complemented by a taper-machined ring face that duplicates the bottom scraping edge of positive twist torsional rings. This design promotes side sealing, preventing oil from being forced under and behind the rings, which enhances oil economy and reduces emissions. The oil control rings are a three-piece Flex Vent design, allowing for better conformability to the bore with a small cross-sectional area. This setup ensures uniform pressure through four steel rails and two expanders, providing reliable oil control and reducing oil consumption. Made in the USA, these rings are durable and built to meet high-performance standards. The set includes enough rings for two pistons, with two rings per groove—except for the rails, which come with two rail rings per one expander ring—making installation straightforward and efficient. Whether you're rebuilding or upgrading, these piston rings offer dependable quality and enhanced engine performance for your Twin Cam motorcycle or engine application.
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