What is the purpose of a Napier hook on a piston ring?

A Napier hook is a specific shape on the back of the second compression ring. It helps the ring to rotate slightly and maintain better contact with the cylinder wall, especially as the ring and bore wear. This can lead to improved sealing and reduced oil consumption.

What does the '4.060in' measurement refer to?

The 4.060-inch measurement refers to the cylinder bore diameter that these piston rings are designed to fit. It's important to match this size precisely to your engine's cylinders for proper sealing and performance.

Are these rings suitable for all engine types?

These are steel second compression rings with specific dimensions (1.0mm x 0.136in) for a 4.060-inch bore. While they are well-built for performance, always confirm they are the correct specification for your particular engine build and intended use.

Mahle OE Piston Rings 3021285B - 4.060in Bore

Name: Mahle Rings Perf Napier Steel 2nd Ring 4.060in x 1.0MM .136in RW Pack Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-perf-napier-steel-2nd-ring-4-060in-x-1-0mm-136in-rw-pack-ri-t14-48462
Price: 294.49 USD
Availability: BackOrder

Mahle Rings Perf Napier Steel 2nd Ring 4.060in x 1.0MM .136in RW Pack Ring Set (48 Qty Bulk Pack)

$294.49

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 second piston rings for 4.060in bore engines. Bulk pack of 48 for engine rebuilds.

Key Features

Set of 48 steel second compression rings.
Designed for a 4.060-inch cylinder bore.
Features a Napier hook design for improved sealing.
Ring dimensions are 1.0mm thick with a 0.136-inch groove width.
Mahle OE quality for reliable engine performance.

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Product Details

If you're rebuilding an engine and need reliable piston rings, this Mahle OE set is a solid option. These are second compression rings designed for a 4.060-inch bore, featuring a Napier hook design and a 1.0mm thickness with a 0.136-inch groove width. The Napier hook helps the ring seal better against the cylinder wall, especially as it wears, which can improve compression and reduce oil consumption over time. This bulk pack contains 48 rings, making it ideal for shops or for anyone tackling multiple engine builds.

Mahle is a well-known name in engine components, and these steel rings are built to perform. Steel offers good durability and strength, making it a popular choice for performance and heavy-duty applications where you need rings that can handle the stress. The precise sizing and well-made construction mean they should fit right into your pistons, helping to ensure a good seal between the piston and cylinder wall. This is crucial for getting the most power out of your engine and keeping it running smoothly.