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

File-fit means the ends of the top compression ring are not pre-gapped. You will need to carefully file them down to achieve the precise ring gap specified for your engine's bore and build.

What are the dimensions of these rings?

This set includes two 1.5mm compression rings and one 3.0mm oil control ring. These dimensions are standard for many performance and rebuild applications.

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 Piston Ring Set 4150MS-15 - File Fit

Name: Mahle MS 4.145in+ .005in 1.5 1.5 3.0 mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-145in-005in-1-5-1-5-3-0-mm-file-fit-rings-t14-29798
Price: 158.86 USD
Availability: BackOrder

Mahle MS 4.145in+ .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 4150MS-15 file fit piston ring set. Features 1.5mm, 1.5mm, 3.0mm standard tension rings for a custom seal.

Key Features

This is a universal fit piston ring set.
Features 1.5mm, 1.5mm, and 3.0mm ring sizes.
The top compression ring is file-fit, allowing for a custom ring gap.
Standard tension rings are used for a solid seal against the cylinder wall.
Mahle is a popular brand for engine components.

This is a universal fit piston ring set. Compatibility with specific vehicles depends on engine build and custom application. Not CARB approved and 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 designed for builders who need a precise seal. The rings measure 1.5mm for the top two grooves and 3.0mm for the oil control ring. This set is intended for applications where you'll be filing the ends of the top compression ring to achieve a specific gap, allowing for a custom fit tailored to your engine's bore and intended use.

Mahle is a well-known name in engine components, and this ring set reflects their focus on engine performance. The standard tension design ensures a solid seal against the cylinder wall, helping to maintain compression and prevent blow-by. Because these are file-fit, they offer an improved level of control over the ring gap compared to pre-gapped rings, which is crucial for engines built for specific performance goals or those with unique bore dimensions.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Proper installation requires careful measurement and filing of the top ring to achieve the correct gap for your engine. Always refer to your engine's specific service manual for recommended ring gap specifications.