What is a Napier hook piston ring?

A Napier hook piston ring has an angled back, creating a scraping effect as the piston moves. This design helps to sweep excess oil from the cylinder walls, reducing oil consumption and blow-by.

What does the '4.615 Bore' specification mean?

This specification indicates the diameter of the cylinder bore that these piston rings are designed to fit. It's crucial to match this bore size to your engine's cylinders for proper sealing and performance.

Why is this product not CARB approved?

Some engine components do not meet the stricter emissions standards set by the California Air Resources Board (CARB). As a result, this product cannot be legally shipped to or sold in California.

Mahle OE Piston Rings 3021192B

Name: Mahle Rings Steel Napier THM-13 4.615 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-steel-napier-thm-13-4-615-bore-x-1-0mm-136-rw-plain-ring-se-t14-47448
Price: 641.24 USD
Availability: BackOrder

Mahle Rings Steel Napier THM-13 4.615 Bore x 1.0MM .136 RW Plain Ring Set (48 Qty Bulk Pack)

$641.24

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 steel Napier piston rings for 4.615" bore. Bulk pack of 48.

Key Features

This is a bulk pack containing 48 sets of piston rings.
Designed for a 4.615-inch bore.
Features a 1.0mm ring thickness.
Utilizes a .136-inch ring width.
Includes a Napier hook design for improved oil control.
Constructed from steel for durability.

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Product Details

Mahle is a well-known name in engine components, often supplying parts directly to vehicle manufacturers. This bulk pack of 48 steel Napier piston ring sets is designed for engine rebuilding projects where consistency and reliability are key. These rings are built for a 4.615-inch bore and feature a 1.0mm thickness with a .136-inch ring width, utilizing a Napier hook design for improved oil control and reduced friction.

The Napier hook design is a notable feature, where the ring's back is angled to create a scraping effect as the piston moves down the cylinder. This helps to sweep excess oil from the cylinder walls, preventing it from entering the combustion chamber. This is particularly beneficial in high-performance or heavy-duty applications where oil consumption and blow-by can be issues. The steel construction offers good durability and resistance to wear, making these rings a solid choice for rebuilding engines that will see regular use.

This is a bulk pack containing 48 sets of rings, making it suitable for shops or builders working on multiple engines or larger fleet projects. Each set is designed for a 4.615-inch bore and includes the specific Napier hook configuration for effective oil management. Please note that these rings are not CARB approved and cannot be shipped to California.