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

File fit rings, like these Mahle MS rings, have top rings that are designed to be filed down to achieve a specific end gap. This allows for precise clearance adjustment during installation, which is important for engine builders.

What are the specific dimensions of these rings?

This set includes a 1.5mm top ring, a 1.5mm second ring, and a 3.0mm oil ring. These dimensions are designed to work together for proper sealing and oil control in the specified bore size.

Can these rings be shipped to California?

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

Mahle MS File Fit Piston Ring Set 4255MS-15

Name: Mahle MS 4.250in+ .005in 1.5 1.5 3.0 mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-250in-005in-1-5-1-5-3-0-mm-file-fit-rings-t14-29803
Price: 179.36 USD
Availability: BackOrder

Mahle MS 4.250in+ .005in 1.5 1.5 3.0 mm File Fit Rings

$179.36

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 for 4.250in+ bore engines. Features 1.5mm/1.5mm/3.0mm ring sizes for a precise fit.

Key Features

Fits engines with a 4.250 inch bore and larger.
Features 1.5mm top ring, 1.5mm second ring, and 3.0mm oil ring dimensions.
File fit design allows for precise end gap adjustment during installation.
Standard tension rings for reliable sealing.
Mahle is a popular brand for engine components.

This is a universal piston ring set designed for a 4.250 inch bore and larger. Please verify compatibility with your specific engine build.

⚠️ 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

When you're rebuilding the top end of your engine and need to ensure a solid seal between the piston and cylinder wall, a good set of piston rings is crucial. This Mahle MS file fit ring set is designed for a 4.250 inch bore and comes with specific ring dimensions: 1.5mm for the top ring, 1.5mm for the second ring, and 3.0mm for the oil ring. The 'file fit' designation means the end gaps on the top rings are designed to be adjusted by you during installation to achieve the perfect clearance for your specific application, which is key for optimal performance and longevity.

Mahle is a well-known name in engine components, and this set is built to meet those standards. The different ring sizes are chosen to work together for effective sealing and oil control. Because these are file fit rings, they offer a level of customization that's important for builders looking to dial in their engine's performance. Remember that these rings are not CARB approved, so they cannot be shipped to California.