What does 'file fit' mean for piston rings?

File fit rings are designed to be filed down by the installer to achieve the precise ring gap needed for a specific engine bore. This allows for a custom fit that can optimize sealing and performance, especially in modified engines.

What is the advantage of low tension rings?

Low tension rings can reduce friction between the piston and cylinder wall compared to higher tension rings. This can lead to improved engine efficiency and potentially a slight increase in power, and they are often favored in performance builds.

Can these rings be used in any engine?

These are universal fitment rings intended for custom engine builds where the installer can set the correct ring gap. They are not CARB approved and cannot be shipped to California. Always confirm they are suitable for your specific engine application.

Mahle File Fit Piston Rings .043in Set 4025ML-043

Name: Mahle MS 4.020in+.005in .043in .043in 3.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-020in-005in-043in-043in-3-0mm-file-fit-rings-t14-29694
Price: 192.78 USD
Availability: BackOrder

Mahle MS 4.020in+.005in .043in .043in 3.0mm File Fit Rings

$192.78

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. These .043in rings are designed for custom engine builds where precise ring gap is crucial.

Key Features

This is a Mahle MS file-fit piston ring set.
Features a .043 inch top ring, a .043 inch second ring, and a 3.0mm oil ring.
Designed to be filed to the correct gap for your specific engine bore.
Low tension design often used in performance applications.
Universal fitment for custom engine builds.
Not CARB approved; cannot ship to California.

These are universal fitment piston rings intended for custom engine builds. Always verify compatibility with your specific engine and application before purchase.

⚠️ 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 an engine and need to get the piston ring gap just right for your specific build, Mahle's file-fit rings are a popular choice. These rings come in a set with a .043 inch top ring, a .043 inch second ring, and a 3.0mm oil ring, all designed to be filed to your exact specification. This allows for a custom fit that can improve sealing and performance in modified or performance engines.

Mahle has been a trusted name in engine components for a long time, and these file-fit rings are well-made for the task. The low tension design is often preferred in performance applications where it can reduce friction. Because they are file-fit, they are intended for builders who understand how to properly set the ring gap for their engine's bore size and intended use. This means you'll need to measure your cylinder bore carefully and have the right tools to file the rings down to the correct clearance.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. If you're working on a performance build and need the flexibility of setting your own ring gap, this Mahle set is a solid option.