What is a Napier hook on a piston ring?

A Napier hook is a specific shape on the second piston ring designed to improve oil control. It helps scrape excess oil from the cylinder wall as the piston travels down, preventing it from entering the combustion chamber.

What does the 1.0mm thickness and .136in ring height refer to?

These measurements refer to the dimensions of the piston ring itself. The 1.0mm is the ring's thickness, and the .136 inch is its height, which must match the groove on the piston for a proper fit.

Is this a complete set of piston rings?

This listing is for the second ring only, which features the Napier design. You will need to purchase the corresponding top compression rings and oil control rings separately to complete a full set for your engine.

Mahle OE Piston Rings 3021286 - Performance Napier Steel

Name: Mahle Rings Performance Napier Steel 2nd Ring 4.080in x 1.0MM .136in RW Plain Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-performance-napier-steel-2nd-ring-4-080in-x-1-0mm-136in-rw--t14-48453
Price: 40.04 USD
Availability: BackOrder

Mahle Rings Performance Napier Steel 2nd Ring 4.080in x 1.0MM .136in RW Plain Ring Set

$40.04

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 Performance Napier Steel 2nd Ring Set for 4.080in bore. Improves oil control and reduces blow-by.

Key Features

Fits 4.080 inch bore engines.
Features a 1.0mm ring thickness and a .136 inch ring height.
The Napier hook design on the second ring helps scrape oil and reduce blow-by.
Constructed from durable steel for reliable performance.
Designed to work with specific pistons and cylinder bores for proper sealing.

Secure CheckoutFast Shipping631-982-0042

Product Details

When you're rebuilding the top end of your engine, getting the piston rings right is crucial for sealing and oil control. This Mahle OE Performance Napier Steel 2nd Ring is designed for a 4.080-inch bore, featuring a 1.0mm thickness and a .136-inch ring height. The Napier hook design on the second ring helps to scrape oil off the cylinder wall as the piston moves down, preventing it from entering the combustion chamber and reducing blow-by.

Crafted from durable steel, this ring is built to withstand the rigors of engine operation. The Napier design is a well-known improvement for oil control, especially in performance applications where cylinder pressures can be higher. Installing these rings correctly ensures a solid seal between the piston and cylinder wall, which is key for maintaining compression and efficient combustion.

This specific ring is the second ring in a set, working in conjunction with the top compression ring and the oil control ring to create a complete sealing package. Ensure you have the correct ring set for your specific piston and bore size to achieve optimal engine performance and longevity.