Mahle Rings Steel Napier THM-13 4.625 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)

These Mahle OE steel piston rings feature a Napier hook design on the second ring, which helps to improve oil control and reduce blow-by. The rings are designed for a 4.625-inch bore and have a 1.0mm top ring thickness, a 0.136-inch second ring groove width, and a standard oil ring configuration. This bulk pack contains 48 sets, making it a solid option for engine builders or shops working on multiple engines.

Crafted from durable steel, these rings are built to withstand the rigors of high-performance applications. The Napier hook on the second ring is a notable design choice that helps the ring to rotate slightly in its groove, which aids in scraping oil from the cylinder wall and preventing it from entering the combustion chamber. This design contributes to improved engine sealing and can help maintain consistent compression over time. The 1.0mm top ring is a common size for many performance and heavy-duty applications, offering a good balance of sealing and durability.

This set is intended for engine rebuilding projects where precise ring sealing and oil management are critical. While these rings are well-made and designed for performance, please note they are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for installation procedures and recommended ring gap settings.