## Namura NA-20040-2R Piston Rings 82.46mm - Reliability and Performance for Your Engine The Namura NA-20040-2R piston rings, with a diameter of 82.46mm, are a crucial component for ensuring optimal performance, durability, and efficiency of your motorcycle or scooter engine. Often overlooked, piston rings play a fundamental role in maintaining combustion chamber seal and proper lubrication. Namura, known for its high-quality parts, offers rings designed for specific applications, guaranteeing a perfect fit and long-lasting operation. ### Advanced Materials and Technologies Namura uses durable materials like ductile cast iron or stainless steel alloy in the production of the NA-20040-2R piston rings, providing excellent wear resistance and sealing capabilities. Additionally, depending on the model, the rings may be coated with chrome, phosphate, or nitride, further enhancing their durability and corrosion resistance. The type of cylinder sleeve, sleeve coating, engine size, and stroke (2 or 4 stroke) are all factors considered in selecting the optimal ring composition. ### Compression Rings The compression rings, made of ductile cast iron or stainless steel alloy, provide a tight seal for the combustion chamber, minimizing pressure loss and optimizing engine performance. Additional coatings such as chrome, nitride, or phosphate increase their resistance to wear and corrosion. ### Oil Rings Oil rings consist of three components: two scraper rails made of ductile cast iron or stainless steel alloy, and a single expander ring made of stainless steel. Their purpose is to precisely control oil delivery, ensuring adequate cylinder lubrication and minimizing oil consumption. By choosing Namura NA-20040-2R piston rings, you are investing in the reliability and longevity of your engine.