Mahle Rings Performance Steel Napier THM-13 4.025 x .043in .135RW Plain Ring Set

Mahle OE offers this steel Napier ring set, part number THM-13, designed for a 4.025 inch bore with a .043 inch top ring thickness and a .135 inch second land width. These rings are a solid choice for engine rebuilds where improved sealing and performance are desired. The Napier hook on the second ring helps to control oil consumption and prevent blow-by, which is crucial for maintaining engine health and power.

Constructed from durable steel, these rings are built to withstand the rigors of combustion. The precise sizing ensures a proper fit within the piston groove, contributing to a well-sealed combustion chamber. This attention to detail helps to maximize compression and minimize oil burning, leading to a more efficient and powerful engine.