Mahle Rings Plasma Moly Steel Top Comp Ring 4.140in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)

The plasma moly steel construction on these top compression rings means they're built to handle the heat and pressure of serious engine work. Measuring 4.140 inches in bore diameter with a .0625 inch thickness and a .190 inch ring groove depth, these rings are designed for performance builds where durability and a solid seal are critical. The plasma moly coating is a key feature, helping to reduce friction and wear on both the ring and the cylinder wall, which translates to a longer-lasting engine and more consistent performance over time.

This is a bulk pack containing 48 rings, making it a practical choice for engine builders or shops working on multiple engines or larger projects. Mahle OE is a well-known name in engine components, and these rings reflect that reputation for well-built parts. The RW designation indicates a specific ring design, often chosen for its ability to create a tight seal under combustion pressure, which is essential for maximizing power and efficiency. When you're rebuilding an engine, especially a performance or heavy-duty application, the quality of your piston rings directly impacts the engine's ability to hold compression and resist blow-by.

Because these are top compression rings, they are the first line of defense against combustion gases escaping past the piston. Ensuring a perfect fit and seal here is paramount. While these are designed for performance, they are also a solid option for a robust rebuild where longevity is just as important as power. Remember to consult your engine's specific service manual for installation details and any required break-in procedures to get the most out of these components.