## Namura NA-50011-4R Piston Rings 97.57mm - Reliability and Performance for Your Engine The Namura NA-50011-4R piston rings with a diameter of 97.57mm are a key element in ensuring optimal engine performance, efficiency, and longevity. Often overlooked, these rings play a fundamental role in maintaining compression and proper lubrication. Namura, known for its high-quality engine components, delivers a product that will meet the expectations of even the most demanding users. ### Advanced Materials and Technologies Namura NA-50011-4R are made of durable and wear-resistant materials such as ductile iron or stainless steel alloy. The choice of material depends on the specific application, cylinder sleeve type, sleeve coating, engine size, and piston stroke. Additional coatings, such as chrome, phosphate, and nitride, increase durability and resistance to extreme temperatures and loads. ### Compression Rings Compression rings ensure the tightness of the combustion chamber, minimizing compression losses and maximizing engine performance. The materials and coatings used guarantee long-lasting and reliable operation. ### Oil Rings Oil rings, consisting of two scraper rails made of ductile iron or stainless steel and a stainless steel expander ring, ensure optimal cylinder lubrication, preventing excessive wear and keeping the engine in excellent condition. By choosing Namura NA-50011-4R piston rings, you are investing in quality, reliability, and the long life of your engine.