What is plasma-moly steel and why is it used for piston rings?

Plasma-moly steel is a material treated with a plasma-moly coating. This coating significantly improves the ring's resistance to wear and reduces friction against the cylinder wall. This leads to a better seal, longer ring life, and improved engine efficiency.

What does the 'RW' designation mean in the ring set name?

The 'RW' designation typically refers to the ring's face design, often indicating a specific type of tension or sealing profile. For these specific rings, it denotes a particular type of top compression ring designed for optimal sealing in various engine conditions.

Can these rings be used in any engine build?

These rings are designed for a 4.135 inch bore and are made from plasma-moly steel, suggesting they are well-suited for performance or heavy-duty applications. However, they are not CARB approved and cannot be shipped to California. Always confirm compatibility with your specific engine build and local regulations.

Mahle OE Piston Rings Plasma Moly Steel 4.135in x .0625in RW

Name: Mahle Rings Plasma Moly Steel Top Comp Ring 4.135in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-plasma-moly-steel-top-comp-ring-4-135in-x-0625in-190in-rw-r-t14-47608
Price: 954.79 USD
Availability: BackOrder

Mahle Rings Plasma Moly Steel Top Comp Ring 4.135in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)

$954.79

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. 4.135in bore x .0625in thick. Bulk pack of 48. Not CARB approved.

Key Features

Verified fitment for 4.135 inch bore engines.
Each ring is .0625 inches thick with a .190 inch ring depth.
Constructed from plasma-moly steel for improved wear resistance and reduced friction.
Helps maintain strong compression and prevent blow-by.
Bulk pack includes 48 rings, suitable for multiple engine builds.
Not CARB approved; cannot ship to California.

Secure CheckoutFast Shipping631-982-0042

Product Details

The plasma-moly steel construction of these Mahle top compression rings means they're built to handle serious heat and stress. Each ring measures 4.135 inches in bore diameter, with a .0625 inch thickness and a .190 inch ring depth, making them a precise fit for many performance and heavy-duty engine builds. This bulk pack contains 48 rings, ideal for shops or engine builders working on multiple engines or large projects.

Mahle's plasma-moly coating is a well-known feature that significantly improves wear resistance and reduces friction between the ring and cylinder wall. This advanced surface treatment helps ensure a strong seal, which is critical for maintaining compression and preventing blow-by, especially under demanding operating conditions. The steel material itself offers good tensile strength, allowing the rings to flex and seal effectively against the cylinder bore even as the engine heats up and components expand.

When rebuilding an engine, especially one that will see heavy use or high performance, the quality of the piston rings is paramount. These Mahle rings are a solid choice for ensuring the longevity and performance of your engine's top end. Please note that these rings are not CARB approved and cannot be shipped to California.