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

File fit means the ends of the top compression ring are intentionally left slightly oversized. This allows you to carefully file them down to achieve the exact ring gap required for your specific engine build, which is important for performance and oil control.

What is the purpose of the +.005 inch sizing?

The +.005 inch sizing on the top ring indicates it's designed for pistons that have already been honed to a specific clearance. This sizing, combined with the file-fit capability, helps ensure you achieve the optimal seal between the piston and cylinder wall.

Are these rings suitable for all engine types?

These rings are a universal fit and feature a common 1.5mm, 1.5mm, 3.0mm configuration. However, they are not CARB approved and cannot be shipped to California. Always confirm compatibility with your specific engine build requirements.

Mahle MS 4.010in+ .005in Piston Ring Set 4015MS-15

Name: Mahle MS 4.010in+ .005in 1.5 1.5 3.0 mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-010in-005in-1-5-1-5-3-0-mm-file-fit-rings-t14-29782
Price: 158.86 USD
Availability: BackOrder

Mahle MS 4.010in+ .005in 1.5 1.5 3.0 mm File Fit Rings

$158.86

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 4.010in+ .005in file fit piston ring set. For engines needing precise ring gap adjustment.

Key Features

This is a universal fit piston ring set.
The ring set features a 1.5mm, 1.5mm, and 3.0mm configuration.
The top compression ring is a file-fit type, allowing for custom gap adjustment.
This set is sized at +.005 inches, intended for pistons honed to a specific clearance.
Mahle is a popular brand for engine components.

This is a universal fit piston ring set. It is not CARB approved and cannot be shipped 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 MS file-fit piston rings are designed for engines where you need to precisely set the ring gap yourself. The rings come in a 1.5mm, 1.5mm, and 3.0mm configuration, which is a common setup for many performance and rebuild applications. The file-fit design means the ends of the top compression ring are left slightly oversized, allowing you to carefully file them down to achieve the exact clearance needed for your specific engine build. This level of control is crucial for optimizing compression and oil control, especially in modified or high-performance engines.

Mahle is a well-known name in engine components, and this set reflects their focus on providing parts that allow for detailed engine building. The +.005 inch sizing on the top ring indicates it's meant for pistons that are already honed to a specific clearance, and the file-fit nature gives you the final say in achieving that perfect seal. Proper ring gap is essential for preventing blow-by, controlling oil consumption, and ensuring the longevity of your engine rebuild.