What is the purpose of the plasma-moly coating on these rings?

The plasma-moly coating on these steel rings is designed to reduce friction between the ring and the cylinder wall. It also helps the ring seat properly, which is important for maintaining good compression and preventing oil from entering the combustion chamber.

Are these rings suitable for a standard engine rebuild or only performance builds?

While these rings are built with performance materials like plasma-moly coated steel for durability under high stress, they can also be used in standard engine rebuilds where a long-lasting, reliable seal is desired. The bulk pack size is particularly useful for professional engine builders.

What cylinder bore size are these rings intended for?

These Mahle piston rings are specifically designed for a 4.005-inch cylinder bore size. It's important to ensure your engine's cylinders are machined to this exact dimension for proper fitment and sealing.

Mahle OE Piston Rings 3011013B - Performance Steel

Name: Mahle Rings Perf Plasma Moly Steel Top Comp 4.005in x .0625in .190 RW Moly Ring Set (48 Qty Bulk Pk)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-perf-plasma-moly-steel-top-comp-4-005in-x-0625in-190-rw-mol-t14-48802
Price: 501.40 USD
Availability: BackOrder

Mahle Rings Perf Plasma Moly Steel Top Comp 4.005in x .0625in .190 RW Moly Ring Set (48 Qty Bulk Pk)

$501.40

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 Plasma Moly Steel Piston Ring Set. 48-piece bulk pack for engine builds.

Key Features

This is a 48-piece bulk pack of Mahle OE Performance Piston Rings.
The top compression rings are constructed from plasma-moly coated steel for improved durability and wear resistance.
Designed for a 4.005-inch cylinder bore size.
The top rings have a thickness of .0625 inches and a ring width of .190 inches.
Plasma-moly coating helps reduce friction and promotes proper ring seating against the cylinder wall.
Suitable for performance engine rebuilds where reliable sealing is essential.

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Product Details

When you're rebuilding an engine, especially for performance applications, the piston rings are critical for sealing the combustion chamber and managing oil. This Mahle OE Performance Plasma Moly Steel Ring Set is built for serious engine work, offering a robust solution for builders who need reliability and consistent performance. These rings are designed to handle the pressures and temperatures found in performance engines, ensuring your rebuild runs strong.

The top compression rings in this set are made from plasma-moly coated steel, a well-known combination for its durability and excellent wear resistance. The plasma-moly coating helps reduce friction and improve the ring's ability to seat properly against the cylinder wall, which is key for maintaining compression and preventing blow-by. The steel construction provides the strength needed to withstand high combustion pressures. This bulk pack includes 48 rings, making it ideal for shops or builders working on multiple engines or those who need spares.

Proper installation is crucial for these high-performance rings. Ensure your cylinder bores are honed to the correct specification for these .0625-inch thick rings and that the ring gaps are set according to your engine's specific requirements. Using the correct ring expander tool will also help prevent damage during installation. This set is designed for a 4.005-inch bore size.