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

File fit rings are designed so you can manually adjust the end gap to precisely match your engine's cylinder bore. This allows for a more accurate seal compared to pre-gapped rings, which is important for engine performance and oil control.

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

The +.005 inch sizing means these rings are slightly larger than a standard size. They are intended to be filed down to achieve the correct end gap in a cylinder bore that has been machined or honed to a specific size, typically 4.185 inches in this case.

Are these rings compatible with all engines?

These are universal rings designed for specific bore sizes and require careful measurement and filing to fit correctly. They are not a direct fit for every engine and are not CARB approved for use in California.

Mahle Piston Rings MS 4.185in +.005in 4190MS-112

Name: Mahle MS 4.185in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-185in-005in-1-0mm-1-0mm-2-0mm-file-fit-rings-t14-29742
Price: 202.98 USD
Availability: BackOrder

Mahle MS 4.185in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

$202.98

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 4.185in +.005in piston ring set. File fit, 1.0mm, 1.0mm, 2.0mm.

Key Features

This is a universal piston ring set.
Features a 1.0mm top ring, 1.0mm second ring, and 2.0mm oil control ring.
The rings are file-fit, allowing for custom gap adjustment.
This set is sized at 4.185 inches with a +.005 inch oversize.
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

Mahle is a well-known name in engine components, particularly for their piston rings. This specific set, the MS 4.185in +.005in file fit rings, is designed for engine rebuilds where precise ring gap adjustment is crucial. The file-fit design allows you to tailor the end gap to your specific engine bore, which is essential for proper sealing and performance.

This ring set features a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring. The +.005 inch sizing indicates these rings are slightly larger than standard, intended to be filed down to achieve the perfect fit in a bore that has been honed to a specific size, typically 4.185 inches. This attention to detail in sizing and the file-fit capability means you can achieve a well-sealed combustion chamber, which is key for reliable engine operation and longevity.

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 correct ring gap specifications and installation procedures.