What is a Napier hook ring?

A Napier hook ring is a type of second compression ring that features a unique shape. This shape helps to scrape oil from the cylinder wall more effectively, preventing it from entering the combustion chamber and contributing to better oil control and reduced blow-by.

What is the advantage of a steel ring set?

Steel rings are known for their strength and durability. They can withstand higher combustion pressures and temperatures compared to cast iron rings, making them a popular choice for performance and heavy-duty engine builds.

Can these rings be shipped to California?

No, these rings are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle OE Piston Rings 3021310B - Performance Steel Napier

Name: Mahle Rings Performance Steel Napier THM-13 4.105 x .043in .135RW Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-performance-steel-napier-thm-13-4-105-x-043in-135rw-plain-r-t14-47694
Price: 269.77 USD
Availability: BackOrder

Mahle Rings Performance Steel Napier THM-13 4.105 x .043in .135RW Plain Ring Set (48 Qty Bulk Pack)

$269.77

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 Steel Napier Piston Ring Set. Bulk pack of 48 rings for engine builds.

Key Features

Fits 4.105 inch bore size.
Features a Napier hook on the second ring for improved oil control.
Top ring thickness is .043 inches, second ring is .135 inches.
Constructed from durable steel for long service life.
Bulk pack includes 48 individual ring sets for multiple engine builds.
Designed for performance engine applications.

Secure CheckoutFast Shipping631-982-0042

Product Details

Mahle OE offers this performance steel Napier ring set, part number 3021310B. This is a bulk pack containing 48 individual ring sets, designed for engine rebuilding applications where multiple engines are being serviced. The Napier hook design in the second ring helps to improve oil control and reduce blow-by, contributing to better engine performance and longevity.

These rings are constructed from durable steel and feature a .043 inch thickness for the top ring and .135 inch for the second ring, with a 4.105 inch bore size. The Napier hook on the second ring is a well-known design for its effectiveness in scraping oil from the cylinder wall and preventing it from entering the combustion chamber. This helps maintain a cleaner burn and can improve overall engine efficiency.

This bulk pack is ideal for machine shops or performance engine builders who frequently work on engines requiring this specific ring configuration. Please note that these rings are not CARB approved and cannot be shipped to California.