Mahle Rings Steel Napier THM-13 4.605 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)

Mahle is a well-known name in the automotive industry, often recognized for their OE-quality engine components. This bulk pack of steel Napier piston rings, part number 3021190B, is designed for engine rebuilding projects where multiple sets are needed. These rings feature a 4.605-inch bore size and a 1.0mm ring width, with a .136-inch ring groove width, making them suitable for specific piston designs.

The Napier hook design in the top ring helps to improve oil control and reduce blow-by, especially in high-performance or heavy-duty applications. This design allows the ring to scrape oil from the cylinder wall on the downstroke and helps seal the combustion chamber on the upstroke. The rings are constructed from steel for durability and consistent tension, which is crucial for maintaining a good seal between the piston and cylinder wall over time. This bulk pack contains 48 sets, ideal for shops or builders working on multiple engines or a large project.

When rebuilding an engine, proper piston ring selection is critical for performance, oil consumption, and overall engine longevity. These Mahle rings are a solid option for those looking for OE-level components in a convenient bulk quantity. Please note that these rings are not CARB approved and cannot be shipped to California.