## Piston Rings 100.47mm Namura NA-40004-2R - Reliability and Performance for Your Engine Namura 100.47mm NA-40004-2R piston rings are a key element for optimal engine performance, durability, and efficiency. Often overlooked, piston rings play a fundamental role in ensuring combustion chamber sealing and proper cylinder lubrication. Namura, known for its high-quality motorcycle and scooter parts, offers piston rings designed for the specific requirements of each application. The piston diameter of 99.97mm perfectly matches this ring set. ### Advanced Materials and Technologies Namura uses carefully selected materials and advanced technologies to ensure the highest quality of its piston rings. The type of cylinder sleeve, sleeve coating, engine size, and stroke type (2 or 4) – all these factors influence the selection of the appropriate ring composition, guaranteeing optimal performance under all conditions. ### Compression Rings Namura compression rings are made of highly ductile cast iron or stainless steel alloy. Both materials offer excellent wear resistance and provide a tight combustion seal. Additional chrome, phosphate, and nitride coatings enhance durability and corrosion resistance. ### Oil Rings Oil rings consist of three separate components: two scraper rails made of highly ductile cast iron or stainless steel alloy, coated with chrome, nitride, or phosphate, and a single expander ring made of stainless steel. This set effectively regulates the amount of oil on the cylinder walls, preventing excessive wear and ensuring optimal lubrication. ### Namura Brand - Guarantee of Quality By choosing Namura NA-40004-2R piston rings, you are investing in the reliability and longevity of your engine. Namura is a brand trusted by professionals and motorcycle enthusiasts worldwide, guaranteeing the highest quality and precision workmanship.