What is the purpose of the Moly coating on these piston rings?

The Moly coating on the face of these rings is a hard, low-friction material. It helps to reduce wear on both the ring and the cylinder wall, and it also aids in a smoother break-in process for your engine.

Why is the seal between the piston and cylinder wall important?

A good seal prevents combustion gases from escaping past the piston (blow-by), which maintains engine compression and power. It also helps prevent engine oil from entering the combustion chamber, which can cause smoking and oil consumption.

Are these piston rings suitable for all engine builds?

These are performance-oriented rings designed for specific bore sizes and applications. It's important to ensure they match your engine's specifications and intended use. They are not CARB approved and cannot be shipped to California.

Mahle OE Piston Ring Set 3011275 - 4.375in x 1/16in

Name: Mahle Rings Performance 4.375in x 1/16in HV385 Steel UCR .190in RW Moly Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-performance-4-375in-x-1-16in-hv385-steel-ucr-190in-rw-moly--t14-48742
Price: 140.99 USD
Availability: BackOrder

Mahle Rings Performance 4.375in x 1/16in HV385 Steel UCR .190in RW Moly Ring Set

$140.99

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 Piston Ring Set with 4.375in x 1/16in steel UCR rings and moly coating. Improves seal for better engine performance.

Key Features

Fits engines with a 4.375 inch bore size.
Features 1/16 inch thick upper compression rings.
Constructed from durable HV385 steel.
Upper compression rings have a Moly coating for improved wear resistance and break-in.
The second ring measures .190 inches thick.
Not CARB approved; cannot ship to California.

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Product Details

These Mahle OE piston rings are made from HV385 steel, a strong material chosen for its durability under engine stress. The UCR (Upper Compression Ring) measures 1/16 inch thick, a common size that helps create a solid seal against the cylinder wall. The face of these rings is coated with Moly, which is a hard, low-friction material that helps reduce wear and improve the break-in process for your engine's cylinders.

Designed for performance applications, this set is built to maintain a tight seal between the piston and cylinder wall. This seal is crucial for preventing combustion gases from escaping into the crankcase (blow-by) and for keeping oil from entering the combustion chamber. A good seal means improved compression, which translates to more power and better fuel efficiency. The .190 inch thickness of the second ring is also a notable detail, contributing to the overall sealing capability of the piston assembly.

Keep in mind that this ring set is not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for proper installation procedures and ring gap specifications.