## Namura NA-20070R Piston Rings 81.96mm - Reliability and Performance Namura NA-20070R piston rings with a diameter of 81.96mm are a key element for ensuring optimal performance, efficiency, and engine durability. Often overlooked, these rings play a vital role in sealing the combustion chamber and controlling oil consumption. Namura, known for its high-quality motorcycle parts, designs its rings for specific applications, taking into account the type of cylinder liner, its coating, engine size, and stroke type (2 or 4). ### Advanced Materials and Technologies The use of high-quality materials is fundamental in the production of piston rings. Namura uses durable cast iron or stainless steel alloys, characterized by excellent wear resistance and providing a tight seal. Additionally, depending on the model, the rings may be coated with chrome, phosphate, or nitride, which increases their durability and corrosion resistance. ### Compression Rings Compression rings, made of ductile cast iron or stainless steel, provide a tight seal of the combustion chamber, minimizing pressure loss and increasing engine efficiency. Chrome, phosphate, or nitride coatings further enhance their wear resistance. ### Oil Control Rings Oil control rings consist of three elements: two scraper rails, made of ductile cast iron or stainless steel, and an expander ring made of stainless steel. Their task is to precisely dose the oil, preventing excessive consumption and ensuring proper cylinder lubrication. By choosing Namura NA-20070R piston rings, you are investing in quality and reliability, which translates into a longer engine life and better performance of your motorcycle or scooter.