What is the benefit of the plasma-moly coating?

The plasma-moly coating is a very hard and wear-resistant surface applied to the top compression ring. It significantly reduces friction between the ring and the cylinder wall, which helps to extend the service life of both components and can improve engine efficiency.

Why is this a bulk pack of 48 rings?

This bulk pack is designed for professional engine builders or shops that frequently work on multiple engines. Having 48 rings on hand ensures you have enough for several builds or can quickly replace a damaged ring during assembly without waiting for a new order.

What does 'RW' typically signify in a piston ring designation?

The 'RW' designation often refers to specific design features of the piston ring, such as a Napier hook on the second ring. While this description is for the top compression ring, these design elements are generally aimed at improving oil control and preventing combustion gases from escaping past the rings (blow-by).

Mahle OE Piston Rings 4.310in x .0625in x .190in RW - 301111

Name: Mahle Rings Plasma Moly Steel Top Comp Ring 4.310in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-plasma-moly-steel-top-comp-ring-4-310in-x-0625in-190in-rw-r-t14-47585
Price: 826.27 USD
Availability: BackOrder

Mahle Rings Plasma Moly Steel Top Comp Ring 4.310in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)

$826.27

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 Plasma Moly Steel Top Compression Rings. 4.310in bore, .0625in thick. Bulk 48-piece pack.

Key Features

Fits a 4.310-inch cylinder bore.
Top compression ring measures .0625 inches thick.
Features a plasma-moly coating for improved wear resistance and reduced friction.
RW ring design for effective sealing and oil control.
Bulk pack includes 48 individual rings, suitable for multiple engine builds.
Constructed from durable steel for long service life.

These piston rings are designed for a 4.310-inch bore. Always consult your vehicle's service manual or engine build specifications to confirm compatibility with your specific application.

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Product Details

These Mahle Plasma Moly steel top compression rings are built for serious engine work, featuring a 4.310-inch bore size and a .0625-inch thickness. The plasma-moly coating on the top ring is a key detail; it's a very hard, wear-resistant surface that helps reduce friction and extend the life of both the ring and the cylinder wall. This is especially important in high-performance or heavy-duty applications where engines work harder and generate more heat.

You're getting a bulk pack of 48 rings here, which is ideal for shops or builders who handle multiple engine builds or need spares on hand. The RW designation typically refers to a specific ring design, often with a Napier hook or similar feature on the second ring (though this is the top compression ring description) that helps with oil control and blow-by prevention. Mahle is a well-known name in engine components, and these rings are made to meet the demands of rebuilding or modifying engines where reliability and performance are critical.

When installing these, pay close attention to ring gap specifications for your specific engine build. Proper ring gap is crucial for sealing, preventing piston slap, and managing oil consumption. Always refer to your engine's service manual or build specifications for the correct clearances. Keep in mind these rings are not CARB approved and cannot be shipped to California.