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

File-fit rings are not pre-gapped. This means you will need to measure and carefully file the ends of the rings to achieve the correct end gap for your specific cylinder bore. This allows for a precise fit in custom engine builds.

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

Low-tension rings can reduce friction within the cylinder bore, potentially leading to improved engine efficiency and a slight increase in power. They are often chosen for performance or custom engine builds where fine-tuning is desired.

Can these rings be shipped to California?

No, these rings are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle File Fit Piston Ring Set 4075ML-043

Name: Mahle MS 4.070in+.005in .043in .043in 3.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-070in-005in-043in-043in-3-0mm-file-fit-rings-t14-29704
Price: 192.78 USD
Availability: BackOrder

Mahle MS 4.070in+.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 MS 4.070in+.005in .043in .043in 3.0mm File Fit Rings. These file-fit rings are designed for custom engine builds where precise ring gap is crucial.

Key Features

This is a universal fit piston ring set.
The top ring is 3.0mm, and the oil rings are 0.043 inches.
These rings are file-fit, allowing for custom end gap adjustment.
The set is 0.005 inches oversized for a 4.070-inch bore.
Features a low-tension design for improved performance tuning.

⚠️ 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 0.005 inches oversized for a 4.070-inch bore, with a 3.0mm top ring and two 0.043-inch oil rings. The low-tension design is a smart choice for builders looking to fine-tune their engine's performance, especially in custom applications where standard ring sets might not offer the exact fit needed. Because they are file-fit, you have the ability to adjust the end gap yourself, ensuring a perfect seal for your specific cylinder bore. This level of control is key for optimizing compression and oil control in performance or rebuilt engines.

Mahle is a well-known name in engine components, and this ring set reflects their focus on precision. The file-fit nature means you'll need to carefully measure and file the ring ends to achieve the correct gap for your engine's bore size and intended use. This process, while requiring attention to detail, allows for a more tailored fit than a standard pre-gapped ring. It's a solid option for engine builders who understand the importance of proper ring-to-wall clearance for optimal engine health and performance.