What is the benefit of plasma moly steel rings?

Plasma moly steel rings, like these from Mahle, feature a surface treatment that significantly improves wear resistance and reduces friction. This leads to a longer service life and helps maintain a proper seal under demanding operating conditions.

What does the '48 Qty Bulk Pack' mean for my build?

This bulk pack contains 48 individual piston rings. This is ideal for engine builders who work on multiple engines, or for V-engines with many cylinders, ensuring you have enough rings on hand for your project without needing to order multiple smaller sets.

Are these rings compatible with all pistons for a 4.155 inch bore?

While these rings are sized for a 4.155 inch bore, their compatibility also depends on the piston's ring groove dimensions (specifically the 0.190 inch groove depth mentioned). It's always best to cross-reference the piston manufacturer's specifications with these ring dimensions to ensure a perfect fit.

Mahle Plasma Moly Steel Piston Rings 4.155in RW Ring Set

Name: Mahle Rings Plasma Moly Steel Top Comp Ring 4.155in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)
Brand: Mahle OE
SKU: mahle-oe-mahle-rings-plasma-moly-steel-top-comp-ring-4-155in-x-0625in-190in-rw-r-t14-47601
Price: 728.81 USD
Availability: BackOrder

Mahle Rings Plasma Moly Steel Top Comp Ring 4.155in x .0625in .190in RW Ring Set (48 Qty Bulk Pack)

$728.81

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. 4.155in bore, 0.0625in thick. Bulk 48-qty pack.

Key Features

Verified fitment for 4.155 inch bore engines.
Plasma moly steel construction offers improved wear resistance and reduced friction.
Designed for optimal sealing of the combustion chamber.
Helps control oil consumption for cleaner operation.
Transfers heat effectively from the piston to the cylinder wall.
0.0625 inch ring thickness and 0.190 inch groove depth.

These piston rings are designed for a 4.155 inch bore. Always consult your vehicle's service manual or the piston manufacturer's specifications to confirm compatibility with your specific engine build.

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Product Details

When you're rebuilding an engine, especially for a high-performance application or a heavy-duty workhorse, the piston rings are a critical component. They seal the combustion chamber, control oil consumption, and transfer heat from the piston to the cylinder wall. This bulk pack of Mahle OE Plasma Moly Steel Top Compression Rings is designed for engine builders who need a reliable, well-built ring for a 4.155-inch bore. The plasma moly coating on these steel rings is a notable upgrade over plain cast iron, offering improved wear resistance and a longer service life, especially under demanding conditions. This means a better seal and more consistent performance over time.

Mahle is a well-known name in engine components, and these rings reflect that reputation. The steel construction provides strength, while the plasma moly surface treatment is applied to reduce friction and resist scuffing, which is crucial for maintaining cylinder wall integrity and ensuring a good seal. The specific dimensions – a 4.155-inch bore diameter, a 0.0625-inch ring thickness, and a 0.190-inch groove depth – are precise to ensure a proper fit in the corresponding piston groove. This pack comes with 48 rings, making it a practical choice for shops that handle multiple engine builds or for those working on larger projects with many cylinders.

It's important to note that these rings are not CARB approved and cannot be shipped to California. Always refer to your specific engine's service manual for detailed installation procedures and specifications to ensure a successful rebuild. Proper installation is key to achieving the performance and longevity these Mahle rings are designed for.