What is the advantage of the Napier hook on the second ring?

The Napier hook on the second ring is designed to improve oil control and reduce blow-by. As the ring rotates, this design helps it seal more effectively against the cylinder wall, contributing to better compression and potentially lower oil consumption.

What is included in this bulk pack?

This pack contains 48 complete sets of Mahle OE THM-13 performance piston rings. Each set is sufficient for one piston.

Can these rings be shipped to California?

No, these rings are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle OE Piston Rings THM-13 4.150in Bore - 3021313B

Name: Mahle Rings Performance Napier THM-13 4.150 x .043 .135in RW Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-performance-napier-thm-13-4-150-x-043-135in-rw-plain-ring-s-t14-48361
Price: 358.04 USD
Availability: BackOrder

Mahle Rings Performance Napier THM-13 4.150 x .043 .135in RW Plain Ring Set (48 Qty Bulk Pack)

$358.04

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle OE THM-13 piston ring set for 4.150in bore engines. Bulk pack of 48 sets for engine builds.

Key Features

Fits engines with a 4.150 inch bore.
Features a Napier hook on the second ring for improved oil control.
Includes 48 complete sets of piston rings.
Top ring is a standard plain face design.
Oil ring is a 3-piece design for effective oil scraping.
Mahle OE brand offers reliable engine components.

This is a bulk pack of piston rings designed for engines with a 4.150 inch bore. Check manufacturer specifications to confirm compatibility with your specific engine build.

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Product Details

This is a bulk pack of 48 sets of Mahle OE THM-13 performance piston rings, designed for a 4.150 inch bore. These rings feature a Napier hook design on the second ring, which helps improve oil control and reduce blow-by, especially in high-performance applications. The top ring is a standard plain face, and the oil ring is a 3-piece design. This set is intended for engine builders or those undertaking multiple engine rebuilds.

Mahle is a well-known name in engine components, and these rings are built to handle demanding conditions. The Napier hook on the second ring is a notable feature that helps the ring seal against the cylinder wall more effectively, particularly as it rotates. This design contributes to better compression sealing and can help keep oil consumption in check. The overall construction is solid, aiming for reliable performance in rebuilt engines.

This bulk pack is a practical choice for shops or serious DIYers who frequently work on engines requiring this specific bore size. Remember that these rings are not CARB approved and cannot be shipped to California.