What is the benefit of the plasma moly coating on these rings?

The plasma moly coating on these Mahle piston rings helps to reduce friction between the ring and the cylinder wall. It also improves the ring's durability and wear resistance, leading to a longer service life and better engine performance.

What does 'ductile iron' mean for these piston rings?

Ductile iron is a type of cast iron that has better strength and toughness than standard gray cast iron. This means the rings are more resistant to breaking or cracking under the high pressures and stresses found inside an engine cylinder.

Are these rings suitable for all engine rebuilds?

These rings are designed for a specific bore size (4.125 inches) and feature specific ring thicknesses (1.5mm and 3.00mm). They are a good choice for engines requiring these dimensions and are not CARB approved, meaning they cannot be shipped to California.

Mahle Piston Rings 3150183.005 - Engine Components

Name: Mahle Rings 4.125in Bore .043in1.5MM3.00MM Plasma Moly Ductile Std Tension Reduced Rad Moly Ring Set
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-4-125in-bore-043in1-5mm3-00mm-plasma-moly-ductile-std-tensi-t14-51661
Price: 192.69 USD
Availability: BackOrder

Mahle Rings 4.125in Bore .043in1.5MM3.00MM Plasma Moly Ductile Std Tension Reduced Rad Moly Ring Set

$192.69

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 4.125in bore and plasma moly ductile rings. Essential for engine rebuilds.

Key Features

Fits a 4.125 inch bore.
Features a plasma moly coating for improved wear resistance and reduced friction.
Includes a 1.5mm second ring and a 3.00mm oil ring.
Constructed from ductile iron for good strength and durability.
Standard tension and reduced radial tension design.
Not CARB approved; cannot ship to California.

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Product Details

The plasma moly coating on these Mahle piston rings is a key detail, offering improved durability and reduced friction compared to plain cast iron rings. This set is designed for a 4.125-inch bore, with specific ring thicknesses of 1.5mm for the second ring and 3.00mm for the oil ring, all featuring standard tension and reduced radial tension. These specifications are crucial for proper sealing and oil control within the cylinder, especially when you're rebuilding an engine.

Mahle OE is known for making well-built engine components, and these rings are no exception. They are made from ductile iron, which provides good strength and resistance to breakage under engine stress. The plasma moly face on the top and second rings helps them wear in smoothly against the cylinder wall, creating a solid seal that keeps combustion pressure where it belongs and oil out of the burn chamber. This attention to material and design helps ensure your engine runs efficiently and reliably after the rebuild.

When you're putting an engine back together, getting the piston rings right is critical. This set is a solid option for many engine builds where a 4.125-inch bore is specified. Remember that these rings are not CARB approved and cannot be shipped to California.