## Namura NA-40004-6R Piston Rings 101.47mm - Reliability and Performance The Namura NA-40004-6R piston rings, with a diameter of 101.47mm, are a key component for optimal engine performance, efficiency, and longevity. Often overlooked, they play a fundamental role in the correct operation of the piston. Namura, known for its high-quality motorcycle and scooter parts, designs its rings for specific applications, taking into account the type of cylinder sleeve, its coating, engine size, and stroke type (two- or four-stroke). ### Advanced Materials and Technologies The materials used in the production of Namura piston rings are one of the most important factors influencing their performance. Both compression and oil rings are made of durable alloys, providing excellent wear resistance and sealing. ### Compression Rings Made of highly ductile cast iron or stainless steel alloy, the compression rings guarantee excellent sealing and minimize compression losses. Additionally, depending on the model, they may be coated with chrome, phosphate, or nitride, further increasing their resistance to wear and corrosion. ### Oil Rings The oil rings consist of three elements: two scraper rings made of highly ductile cast iron or stainless steel alloy, and one expander ring made of stainless steel. Similar to compression rings, scraper rings may have a chrome, nitride, or phosphate coating, which ensures optimal lubrication and prevents excessive oil consumption. By choosing Namura NA-40004-6R piston rings, you are investing in the reliability and longevity of your engine.