## Namura NA-50012-4R Piston Rings 87.93mm - Reliability and Performance Often overlooked, piston rings are a crucial component impacting engine performance, durability, and combustion efficiency. Namura NA-50012-4R piston rings, with a diameter of 87.93mm, guarantee top-tier quality and precision manufacturing. Designed for specific application requirements, they ensure optimal performance and long service life. ### Advanced Materials and Technologies Namura uses high-quality materials in the production of its piston rings, such as ductile cast iron and stainless steel alloys. This gives the rings excellent wear resistance and provides a tight seal. Additional coatings, like chrome, phosphate, and nitride, further enhance their durability and corrosion resistance. The type of cylinder sleeve, its coating, engine size, and piston stroke (2 or 4) are all considered when designing Namura rings to ensure a perfect fit and optimal operation. ### Compression Rings The compression rings, made of highly ductile cast iron or stainless steel alloy, provide a tight seal for the combustion chamber. Chrome, phosphate, or nitride coatings further enhance their wear and corrosion resistance. ### Oil Control Rings Oil control rings consist of three components: two scraper rails constructed of ductile cast iron or a stainless steel alloy with a chrome, nitride, or phosphate coating, and a single expander ring made of stainless steel. These rings ensure precise oil metering, minimizing oil consumption and preventing it from entering the combustion chamber. By choosing Namura NA-50012-4R piston rings, you invest in the reliability and performance of your engine.