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

File-fit means the end gap of the piston rings is not pre-set. You will need to file the ends of the rings to achieve the correct gap for your specific cylinder bore size during installation. This allows for a precise fit in custom engine builds.

What is the advantage of a low-tension ring design?

Low-tension piston rings exert less pressure against the cylinder wall. This can lead to reduced friction, potentially improving engine efficiency and power output, especially in performance applications.

Can these rings be used in any engine?

These rings are designed for custom engine builds and require precise fitting to the cylinder bore. They are not a direct replacement for all stock engines and are not CARB approved, meaning they cannot be shipped to California.

Mahle File Fit Piston Ring Set 4015ML-043

Name: Mahle MS 4.010in+.005in .043in .043in 3.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-010in-005in-043in-043in-3-0mm-file-fit-rings-t14-29693
Price: 192.78 USD
Availability: BackOrder

Mahle MS 4.010in+.005in .043in .043in 3.0mm File Fit Rings

$192.78

On Backorder

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

Mahle file fit piston ring set, 4.010in+.005in. Designed for custom engine builds.

Key Features

Fits 4.010 inch bore with an additional 0.005 inch clearance.
Features a low-tension design for improved efficiency.
Ring dimensions are .043 inch, .043 inch, and 3.0mm.
File-fit design allows for custom end gap adjustment.
Designed for custom and performance engine builds.
Not CARB approved; cannot ship to California.

⚠️ 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

These Mahle file-fit piston rings are precisely sized at 4.010 inches with an additional 0.005 inch clearance, featuring a low-tension design with 0.043 inch, 0.043 inch, and 3.0mm ring dimensions. This specific sizing and file-fit capability are crucial for builders who need to achieve a perfect seal in custom or performance engine builds where standard rings might not offer the exact fit required. The low-tension design helps reduce drag, potentially improving engine efficiency and responsiveness.

Mahle is a well-known name in engine components, and these rings reflect their focus on precision. The file-fit nature means you'll need to carefully adjust the end gap yourself during installation to match your specific cylinder bore, ensuring optimal performance and preventing issues like ring flutter or blow-by. This level of adjustability is often sought after in performance applications or when working with non-standard bore sizes.

Because these are file-fit rings, they are intended for experienced engine builders or those undertaking a detailed rebuild. It's important to note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine build specifications and Mahle's installation guidelines to ensure proper fitment and performance.