## Namura NA-50019-2R Piston Rings 99.44mm - Reliability and Performance Namura NA-50019-2R piston rings with a diameter of 99.44mm are a key element for optimal engine operation. Often overlooked, these rings play a vital role in performance, durability, and combustion efficiency. Namura, known for its high-quality motorcycle and scooter parts, designs piston 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 materials used are one of the most important factors influencing the performance of piston rings. 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 applied 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 and minimize pressure loss. Chrome, phosphate, or nitride coatings further enhance their durability and wear resistance. ### Oil Control Rings Oil control 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. This set effectively regulates the amount of oil on the cylinder walls, preventing excessive wear and ensuring optimal lubrication. By choosing Namura NA-50019-2R piston rings, you are investing in the reliability and longevity of your engine.