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

File-fit rings allow you to precisely set the end gap yourself by filing down the ends. This is important for achieving the correct seal in your engine, especially if the cylinder bore is not perfectly standard or if you are building a performance engine.

What do the dimensions 1.5mm, 1.5mm, 3.0mm refer to?

These dimensions refer to the thickness of the piston rings. The first two numbers (1.5mm) are for the top compression ring and the second compression ring, while the third number (3.0mm) is for the oil control ring.

Why are these rings not CARB approved?

These rings are not CARB (California Air Resources Board) approved, which means they do not meet California's emissions standards for replacement parts. As a result, they cannot be legally shipped to California.

Mahle File Fit Piston Rings 3.581in+.005in 1.5 1.5 3.0 mm 35

Name: Mahle MS 3.581in+.005in 1.5 1.5 3.0 mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-3-581in-005in-1-5-1-5-3-0-mm-file-fit-rings-t14-29821
Price: 158.86 USD
Availability: BackOrder

Mahle MS 3.581in+.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 file fit piston ring set. 3.581in bore size, +.005in oversize. 1.5mm, 1.5mm, 3.0mm ring dimensions.

Key Features

This is a Mahle MS piston ring set.
The bore size is 3.581 inches with a +.005 inch oversize.
Ring dimensions are 1.5mm, 1.5mm, and 3.0mm.
These are standard tension file-fit rings.
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 3.581 inches with a +.005 inch oversize, meaning they're designed for engines that have been bored out slightly beyond their original specification. The ring dimensions are 1.5mm for the top and second rings, and 3.0mm for the oil ring, which are standard tensions for many applications. File-fit rings give you the flexibility to precisely set the end gap yourself, ensuring a perfect seal in your engine build, especially if you're working with custom piston-to-wall clearances or slightly worn cylinder walls.

Mahle is a well-known name in engine components, and this set reflects their focus on providing parts that allow for accurate engine rebuilding. The file-fit design is a practical choice for mechanics who want to dial in their engine's compression and oil control. Because you're setting the gap yourself, you can tailor it to your specific engine's needs, which is crucial for optimal performance and longevity after a rebuild.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for proper installation procedures and recommended ring gap settings.