What is the purpose of the plasma moly coating on the top ring?

The plasma moly coating on the top compression ring is applied to increase its durability and reduce friction. This helps the ring withstand the high temperatures and pressures in the combustion chamber while maintaining a good seal and extending its lifespan.

What does the '4.045in' measurement refer to?

The '4.045in' measurement indicates the bore diameter of the cylinder that these piston rings are designed to fit. This is a critical dimension for ensuring a proper seal between the piston and the cylinder wall.

Are these rings suitable for a stock engine rebuild?

While these rings are designed for performance, their durable construction and ability to create a tight seal also make them a solid option for a stock engine rebuild where longevity and proper compression are key. Always ensure they meet the specific requirements of your engine build.

Mahle Piston Rings 3011019B - Performance Steel

Name: Mahle Rings Perf Plasma Moly Steel Top Comp 4.045in 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-4-045in-x-0625in-190-rw-mol-t14-48798
Price: 622.87 USD
Availability: BackOrder

Mahle Rings Perf Plasma Moly Steel Top Comp 4.045in x .0625in .190 RW Moly Ring Set (48 Qty Bulk Pk)

$622.87

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 Piston Ring Set for 4.045" bore engines. Features plasma moly steel top compression rings for durability.

Key Features

Fits 4.045 inch bore engines.
Top compression rings are made of steel with a plasma moly coating for improved durability and reduced friction.
Top compression ring measures 0.0625 inches thick and 0.190 inches deep.
Bulk pack includes 48 sets of piston rings.
Designed for performance applications and engine rebuilds.
Not CARB approved; cannot ship to California.

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Product Details

When you're rebuilding the top end of an engine, especially for performance applications or when you need to ensure a solid seal after a bore job, a good set of piston rings is crucial. These Mahle OE Performance Piston Rings are designed to create a tight seal between the piston and cylinder wall, which is essential for proper compression, efficient combustion, and preventing oil from entering the combustion chamber. This bulk pack contains 48 sets, making it ideal for shops or builders working on multiple engines or larger projects.

These rings are constructed from steel with a plasma moly coating on the top compression ring. Steel offers good strength and resilience, while the plasma moly coating is known for its durability and reduced friction. This combination helps the rings withstand the heat and pressure of combustion while maintaining a consistent seal over time. The top compression ring has a thickness of 0.0625 inches and a depth of 0.190 inches, fitting pistons with a 4.045-inch bore. Proper ring gap is critical for performance and longevity, so ensure you set them according to your engine's specific build requirements.

This set is not CARB approved and cannot be shipped to California. Always refer to your engine's service manual for correct installation procedures and specifications, including ring gap settings, which are vital for optimal performance and engine life.