## Namura NA-40008-2R Piston Rings 84.92mm The Namura NA-40008-2R piston rings, with a diameter of 84.92mm, are a crucial component for optimal engine performance, efficiency, and longevity. Namura, a brand known for high-quality motorcycle parts, designs its rings for specific applications, taking into account the type of cylinder sleeve, its coating, engine displacement, and stroke type (2 or 4). ### Key Features of Namura Piston Rings: * **Precise Fit:** The 84.92mm diameter guarantees a perfect fit within the cylinder, minimizing compression loss and ensuring optimal engine operation. * **Durable Materials:** Namura rings are made of high-quality materials such as ductile cast iron or stainless steel, providing excellent wear and corrosion resistance. * **Advanced Coatings:** Depending on the model, the rings may be coated with chrome, phosphate, or nitride, further enhancing their durability and resistance to extreme temperatures and loads. * **Optimal Sealing:** The specially designed ring profile ensures a tight seal of the combustion chamber, minimizing blow-by and power loss. ### Compression Rings: Made of highly ductile cast iron or stainless steel alloy, they feature excellent wear resistance and provide a gas-tight seal. Chrome, phosphate, and nitride coatings further enhance their properties. ### Oil Rings: The oil ring set consists of three components: two scraper rails made of ductile cast iron or stainless steel with a chrome, nitride, or phosphate coating, and a single expander ring made of stainless steel. Their function is to effectively scrape excess oil, preventing it from entering the combustion chamber. By choosing Namura NA-40008-2R 84.92mm piston rings, you invest in quality and reliability, ensuring optimal operating conditions for your engine.