## Namura NA-50091R Piston Rings - Reliability and Performance for Your Engine Namura NA-50091R piston rings, designed for pistons with diameters of 92.95mm, 92.96mm, and 92.97mm, are a crucial component for optimal performance, efficiency, and engine longevity. Often overlooked, piston rings play a vital role in ensuring combustion chamber sealing and proper lubrication. Namura, a renowned manufacturer of motorcycle and scooter parts, delivers top-quality piston rings designed for the specific requirements of various engines. ### Advanced Materials and Technologies The materials used in the production of Namura NA-50091R piston rings are one of the most important factors influencing their performance. The type of cylinder sleeve, its coating, engine size, and piston stroke (2 or 4 stroke) all influence the selection of the optimal ring composition. ### Compression Rings Made of highly ductile cast iron or stainless steel alloy, the compression rings offer excellent wear resistance and ensure a tight seal in the combustion chamber. Additional chrome, phosphate, and nitride coatings enhance their durability and resistance to extreme temperatures. ### Oil Rings Oil rings consist of three separate components: two scraper rings made of highly ductile cast iron or stainless steel, coated with chrome, nitride, or phosphate, and one expander ring made of stainless steel. This design ensures precise oil metering, minimizing oil consumption and preventing it from entering the combustion chamber. By choosing Namura NA-50091R piston rings, you invest in the reliability and longevity of your engine.