## Piston Rings 91.42mm Namura NA-50093-4R - Reliability and High Performance Namura NA-50093-4R piston rings with a diameter of 91.42mm are a key element ensuring optimal engine operation. Although often overlooked, these rings have a huge impact on performance, durability, and combustion efficiency. 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 (2 or 4). ### Advanced Materials and Technologies The materials and technologies used guarantee the reliability and long life of Namura rings. Both compression and oil rings are made of high-quality alloys, providing excellent wear resistance and sealing. ### Compression Rings Made of highly ductile cast iron or stainless steel alloy, the compression rings are characterized by exceptional wear resistance and provide excellent sealing. Additionally, chrome, phosphate, and nitride coatings increase their durability and resistance to extreme temperatures. ### Oil Rings Oil rings consist of three elements: two scraper rails 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 optimal lubrication and minimizes oil consumption. ### Technical Parameters: * Piston Diameter: 91.42mm * Brand: Namura By choosing Namura NA-50093-4R piston rings, you invest in quality and reliability, which translates into a longer engine life and better performance of your motorcycle or scooter.