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Upgrade your engine's performance with the HASTINGS piston rings designed specifically for Big Twin motorcycles. This set includes top compression rings, second compression rings, and oil control rings, all engineered to optimize combustion efficiency and oil management. The top compression rings feature a barrel face that aids in heat transfer between the piston and cylinder wall, which is critical for maintaining optimal operating temperatures and preventing overheating. They also effectively control combustion gases, ensuring that energy from expanding gases is efficiently transferred to the crankshaft for smooth power delivery.
The second compression rings are designed with a reverse torsional taper face that promotes side sealing, preventing oil from being forced under or behind the rings. This design enhances oil economy and reduces oil consumption, contributing to longer engine life and better performance. The reverse twist combined with taper-machined ring faces mimics the bottom scraping edge of a positive twist torsional ring, ensuring a tight seal and efficient operation. The oil control rings are a three-piece flex vent design, allowing for smaller cross-sectional rails that conform better to the bore for uniform pressure distribution. This design ensures positive oil control by maintaining consistent pressure through four steel rails and two expanders, effectively reducing oil consumption and preventing oil from entering the combustion chamber.
Manufactured in the USA, these piston rings are precision-engineered to match the thermal conductivity and design specifications of KB pistons. Proper installation, especially the top ring end gap, is essential for optimal performance; detailed instructions are provided to ensure correct fitting. The set includes enough rings for two pistons, with two rings per groove (except for the rails, which are paired with an expander ring). Whether you're performing a rebuild or upgrading your engine, these HASTINGS piston rings offer reliable performance and durability to keep your motorcycle running smoothly and efficiently.
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