## Namura NA-40008-4R Piston Rings 85.42mm Often overlooked, piston rings are a crucial component influencing piston performance, engine efficiency, and durability. Namura, a renowned manufacturer of motorcycle and scooter parts, offers the NA-40008-4R piston rings with a diameter of 85.42mm, designed for optimal performance and long service life. The materials used in the production of Namura rings are a key factor determining their performance. The type of cylinder sleeve, sleeve coating, engine size, and stroke (2 or 4) all influence the selection of the optimal material composition best suited for the operating environment. ### Key features of Namura piston rings: * **Precise manufacturing:** Namura NA-40008-4R piston rings are characterized by precise manufacturing, guaranteeing a perfect fit and seal. * **High-quality materials:** The use of high-quality materials, such as ductile iron or stainless steel alloy, ensures excellent wear and corrosion resistance. * **Optimal performance:** Specially designed Namura rings contribute to improved engine performance, reduced fuel consumption, and extended engine life. * **Durability and reliability:** Solid construction and careful workmanship guarantee long-lasting and trouble-free operation. ### Types of piston rings: #### Compression Rings: Made of highly ductile cast iron or stainless steel alloy, they are characterized by excellent wear resistance and provide a tight seal. Chrome, phosphate, and nitride coatings are also used to meet the demands of the application. #### 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. By choosing Namura NA-40008-4R piston rings, you are investing in quality, performance, and the longevity of your engine.