What is a Napier hook on a piston ring?

A Napier hook is a specific design on the second piston ring that creates a scraping action against the cylinder wall. This helps to control oil consumption by preventing excess oil from entering the combustion chamber.

What does 'plain ring set' mean?

A plain ring set indicates that the rings do not have special coatings or surface treatments beyond their base material and manufacturing process. They are designed for standard engine rebuilds where specific aftermarket coatings are not required.

Why is this product not CARB approved?

This product is not CARB (California Air Resources Board) approved, which means it cannot be legally shipped to or installed in California due to emissions regulations. Always check local regulations for parts compatibility.

Mahle OE Piston Rings 3021339 - Steel Napier 2nd Ring

Name: Mahle Rings Performance Steel Napier 2nd Ring 3.5531in x 1.2MM .135in RW Plain Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-performance-steel-napier-2nd-ring-3-5531in-x-1-2mm-135in-rw-t14-47789
Price: 38.21 USD
Availability: BackOrder

Mahle Rings Performance Steel Napier 2nd Ring 3.5531in x 1.2MM .135in RW Plain Ring Set

$38.21

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 2nd Ring Set. Features a 1.2MM thick Napier hook for improved oil control.

Key Features

Features a 1.2MM thick steel Napier hook on the second ring for improved oil control.
Designed for a 3.5531-inch bore diameter.
Includes plain rings, suitable for standard engine rebuilds.
Mahle OE is a well-known brand for engine components.
Steel construction offers durability for engine applications.

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Product Details

This Mahle OE piston ring set features a 1.2MM thick Napier hook on the second ring, a design choice that helps improve oil control by creating a scraping action against the cylinder wall. The rings are made from steel, offering a solid option for engine rebuilds where durability and performance are key. This specific set is designed for a 3.5531-inch bore diameter and includes plain rings, meaning they don't have any special coatings or treatments beyond their base material and manufacturing process.

When you're rebuilding an engine, the piston rings are critical for sealing the combustion chamber, transferring heat from the piston to the cylinder wall, and regulating oil consumption. This Mahle OE set is a well-built component that aims to restore or enhance these functions. The Napier hook design on the second ring is a notable feature that helps prevent oil from entering the combustion chamber, reducing smoke and oil burning. It's a practical detail that makes a difference in how your engine runs after a rebuild.

Keep in mind that this ring set is not CARB approved and cannot be shipped to California. Always refer to your vehicle's specific service manual for proper installation procedures and ring gap specifications to ensure optimal performance and longevity of your engine rebuild.