## Namura NA-10001-5R Piston Rings 87.23mm - Reliability and Performance The Namura NA-10001-5R piston rings with a diameter of 87.23mm are a key element in ensuring optimal performance, efficiency, and longevity of your engine. Often overlooked, these rings play a vital role in sealing the combustion chamber and controlling oil consumption. 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 choice of materials for the production of piston rings is crucial for their performance. Namura uses highly ductile cast iron or stainless steel alloy, both characterized by excellent wear resistance and providing a tight seal. Additionally, depending on the model, chrome, phosphate, and nitride coatings are used to meet the requirements of a specific engine. ### Compression Rings Compression rings, made of highly ductile cast iron or stainless steel alloy, ensure the tightness of the combustion chamber, minimizing compression losses and maximizing engine power. Chrome, phosphate, or nitride coatings further enhance their durability and wear resistance. ### Oil Rings Oil rings consist of three components: two scraper rails made of highly ductile cast iron or stainless steel alloy, also coated with chrome, nitride, or phosphate, and one expander ring made of stainless steel. This set effectively regulates the amount of oil on the cylinder walls, preventing excessive oil consumption and ensuring optimal lubrication. By choosing Namura NA-10001-5R piston rings, you are investing in quality and reliability, providing your engine with optimal operating conditions.