What is the Napier hook design and why is it important?

The Napier hook design is a specific shape on the piston ring that creates a small oil-trapping pocket. This helps to control oil consumption by preventing excess oil from reaching the combustion chamber and also aids in keeping the ring properly seated against the cylinder wall for better sealing.

What does 'bulk pack' mean for this product?

A bulk pack means you receive a larger quantity of the item than typically sold individually. This specific pack contains 48 sets of piston rings, making it suitable for engine builders or shops working on multiple engines with the same bore size.

Are these rings suitable for all engines with a 4.610-inch bore?

While these rings are designed for a 4.610-inch bore, compatibility also depends on the specific piston ring groove width and overall engine design. It's always best to consult your engine's service manual or Mahle's fitment guide to ensure they are the correct rings for your application.

Mahle OE Piston Rings THM-13 4.610 Bore Steel Napier Set

Name: Mahle Rings Steel Napier THM-13 4.610 Bore x .043in .135 RW Plain Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-steel-napier-thm-13-4-610-bore-x-043in-135-rw-plain-ring-se-t14-47454
Price: 518.36 USD
Availability: BackOrder

Mahle Rings Steel Napier THM-13 4.610 Bore x .043in .135 RW Plain Ring Set (48 Qty Bulk Pack)

$518.36

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 Ring Set, THM-13, 4.610 Bore, 0.043in. Bulk pack of 48 rings.

Key Features

This product is a bulk pack containing 48 sets of piston rings.
Designed for a 4.610-inch cylinder bore.
Features a THM-13 Napier hook design for improved oil control and reduced blow-by.
Ring thickness is 0.043 inches.
Ring groove width is 0.135 inches.
Constructed from durable steel for reliable engine performance.

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Product Details

In this bulk pack, you'll receive 48 sets of Mahle OE Steel Napier Piston Rings, designed for a 4.610-inch bore. These rings feature a THM-13 Napier hook design, which helps with oil control and prevents blow-by, especially in high-performance or heavy-duty applications. The rings themselves are 0.043 inches thick, with a 0.135-inch ring groove width, and are made from durable steel for long-lasting performance.

Mahle is a well-known name in engine components, and these rings are built to meet OE specifications, meaning they're made to fit and function just like the original parts. The Napier hook design is a key feature here; it creates a small pocket that traps oil, helping to keep it from getting into the combustion chamber and also ensuring the ring stays properly seated against the cylinder wall. This is crucial for maintaining good compression and preventing oil consumption. The steel construction offers strength and resilience, standing up to the rigors of engine operation.

This is a bulk pack, so it's ideal for shops or builders who work on multiple engines that share this specific bore size. It's important to note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for installation procedures and torque specifications.