Mahle Rings Perf Steel Napier THM-13 4.140in x .1.5MM .150RW Bulk Plain Ring Set (48 Qty Bulk Pack)

These Mahle Performance Steel Napier piston rings feature a 1.5mm top ring and a 0.150-inch Napier second ring, designed for a 4.140-inch bore. The Napier hook on the second ring helps to scrape oil from the cylinder wall, which is crucial for preventing blow-by and ensuring proper lubrication. This bulk pack contains 48 rings, making it a solid option for engine builders working on multiple projects or high-volume rebuilds.

The steel construction offers good durability and resistance to wear, especially important in performance applications where cylinder pressures can be higher. Mahle is a well-known name in engine components, and these rings are built to meet the demands of a performance rebuild. Proper installation is key to their function; ensure the cylinder walls are honed correctly and the rings are gapped according to the engine builder's specifications for optimal sealing and oil control.