What does 'file-fit' mean for these piston rings?

File-fit rings need to be custom-gapped by the installer to match the specific clearance of your engine's cylinder bore. This ensures a perfect seal and prevents the rings from butting up against each other during operation.

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

The plasma moly coating on the top ring is a hard, durable surface that helps resist wear and maintain a tight seal against the cylinder wall. This contributes to better combustion pressure sealing and improved engine longevity.

Are these rings suitable for a stock engine rebuild?

While these rings are used in high-performance applications, their file-fit nature and advanced materials make them a solid option for a performance-oriented engine rebuild. For a basic stock rebuild, ensure you have the necessary tools and expertise for proper gapping.

JE Pistons Piston Ring Set J92608-4145-5

Name: JE Pistons Ring Sets 1.2-1.2-3mm MOLY
Brand: JE Pistons
SKU: je-pistons-je-pistons-ring-sets-1-2-1-2-3mm-moly-t14-297745
Price: 319.99 USD
Availability: BackOrder

JE Pistons Ring Sets 1.2-1.2-3mm MOLY

$319.99

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

JE Pistons Moly Piston Ring Set J92608-4145-5. File fit, 1.2-1.2-3mm. For engine rebuilds.

Key Features

Fits: Engine rebuilds requiring file-fit piston rings.
Top Ring: 1.2mm carbon steel with plasma moly coating.
Second Ring: 1.2mm ductile iron with phosphate coating.
Oil Ring: 3mm carbon steel with chrome finish and low tension design.
File-fit design allows for custom gapping to match cylinder bore.
Designed to maximize horsepower through precise combustion sealing.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

When you're rebuilding the top end of your engine, getting the piston rings seated correctly is crucial for performance and longevity. This set from JE Pistons is designed to help you achieve that precise seal. They're built to maximize horsepower by ensuring combustion pressure stays where it belongs, in the cylinder.

This particular set features a 1.2mm top ring made of carbon steel with a plasma moly coating for durability and good sealing. The second ring is also 1.2mm, constructed from ductile iron with a phosphate coating. For the oil ring, you get a 3mm carbon steel ring with a chrome finish, designed for low tension to reduce drag. These are file-fit rings, meaning you'll need to gap them yourself to perfectly match your cylinder bore, a common practice for performance builds to ensure optimal sealing and prevent piston damage.

JE Pistons uses the same techniques for these rings that you'd find on race cars in NHRA Pro Stock and NASCAR. This means you're getting a well-built set that can handle demanding use, offering improved durability and reduced friction for better power output.