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

The Napier hook design on the second ring is an oil control feature. It helps to scrape oil from the cylinder wall more effectively and prevents the ring from sticking in its groove, which aids in maintaining a proper seal and preventing oil consumption.

What does the '1.0MM .136 RW' specification mean?

This refers to the ring dimensions. '1.0MM' is the thickness of the top compression ring. '.136 RW' indicates the width of the second ring, which is .136 inches, and 'RW' likely denotes the ring width measurement.

Are these rings suitable for all engine builds?

These rings are designed for a specific bore size (4.600 inches) and feature a Napier hook second ring, making them suitable for many performance and rebuild applications. However, always verify compatibility with your specific piston and engine design before installation.

Mahle OE Piston Rings THM-13 1.0MM .136 RW 3021189B

Name: Mahle Rings Steel Napier THM-13 4.600 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-steel-napier-thm-13-4-600-bore-x-1-0mm-136-rw-plain-ring-se-t14-47460
Price: 588.98 USD
Availability: BackOrder

Mahle Rings Steel Napier THM-13 4.600 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)

$588.98

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

Key Features

This product is a bulk pack containing 48 sets of piston rings.
Designed for a 4.600-inch bore size.
Features a 1.0mm top ring and a .136-inch ring width.
Includes a Napier hook design on the second ring for improved oil control.
Constructed from steel for durability.
Mahle OE brand ensures a well-known and trusted component.

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Product Details

This bulk pack contains 48 sets of Mahle OE Steel Napier piston rings, designed for a 4.600-inch bore. Each set features a 1.0mm top ring, a .136-inch ring width, and a Napier hook design on the second ring, which helps with oil control and prevents sticking. These rings are a solid choice for engine builders working on multiple projects or for those who need a significant quantity of high-quality replacement parts.

Mahle is a well-known name in engine components, and these rings reflect their commitment to reliable performance. The steel construction offers good durability, while the Napier hook on the second ring is a notable design feature that aids in proper oil scraping and helps maintain a good seal between the piston and cylinder wall. This design is particularly effective at preventing oil from entering the combustion chamber, which can lead to smoking and reduced engine efficiency. The precise sizing ensures a proper fit within the piston groove, critical for optimal compression and oil control.

When rebuilding an engine, the piston rings are a crucial component for sealing the combustion chamber, regulating oil consumption, and transferring heat from the piston to the cylinder wall. Using well-made rings like these from Mahle is essential for the longevity and performance of your engine. This bulk pack is ideal for professional engine shops or serious DIYers tackling multiple builds, offering a cost-effective way to stock up on essential internal engine components.