Mahle Rings Steel Napier THM-13 4.630 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)

This bulk pack gives you 48 sets of Mahle OE Steel Napier piston rings, designed for engines with a 4.630-inch bore. Each set features a 1.0mm top ring and a 0.136-inch Napier second ring, both made from durable steel. These rings are crucial for sealing the combustion chamber, controlling oil consumption, and transferring heat from the piston to the cylinder wall. The Napier hook on the second ring is a well-known design that helps to scrape oil off the cylinder wall more effectively, contributing to improved oil control and reduced blow-by.

Mahle is a well-known name in engine components, and these rings reflect their commitment to reliable performance. The steel construction offers good wear resistance and strength for demanding applications. The specific ring dimensions, including the 1.0mm top ring and the 1.0mm oil ring (often paired with the .136 Napier second ring), are designed to work together to maintain a tight seal under various operating conditions. This bulk pack is ideal for engine builders or shops that frequently work on engines requiring these specific dimensions.

When installing these rings, ensure the cylinder walls are properly honed and clean. Proper ring gap setting is critical for performance and longevity, so always refer to the specific engine builder's guidelines or Mahle's technical documentation for correct installation procedures. This set is not CARB approved and cannot be shipped to California.