## Namura NA-40004R Piston Rings 99.97mm - Reliability and Performance for Your Engine Namura NA-40004R piston rings with a diameter of 99.97mm are a key component for ensuring optimal engine performance, efficiency, and longevity. Often overlooked, piston rings play a fundamental role in sealing the combustion chamber and controlling oil consumption. Namura, known for high-quality motorcycle and scooter parts, offers piston rings designed for specific applications, guaranteeing a perfect fit and reliability. ### Advanced Materials and Technologies Namura utilizes advanced materials and technologies in the production of its piston rings. The type of cylinder sleeve, sleeve coating, engine size, and piston stroke (2 or 4 stroke) – all these factors are considered when selecting the optimal material composition to meet the demands of the operating environment. ### Compression Rings Namura NA-40004R compression rings are made of highly ductile cast iron or stainless steel alloy. Both materials possess excellent wear resistance and provide a tight seal for the combustion chamber. Additionally, depending on the model, chrome, phosphate, and nitride coatings are used to meet specific requirements. ### 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 ensures precise oil metering, minimizing oil consumption and protecting the engine from excessive friction. ### Technical Parameters: * Piston Diameter: 99.97mm * Brand: Namura * Model: NA-40004R By choosing Namura NA-40004R piston rings, you are investing in the quality and longevity of your engine.