What does 'file fit' mean for the top ring?

File fit means the ends of the top piston ring are not pre-gapped. You will need to measure your cylinder bore and file the ring ends to achieve the correct gap for your specific engine build. This allows for precise tuning of the ring seal.

What is the purpose of the different ring sizes (1.2mm x 1.2mm x 2.8mm)?

These dimensions refer to the thickness of the top compression ring (1.2mm), the second compression ring (1.2mm), and the oil control ring (2.8mm). This specific sizing is chosen by Manley for optimal performance and sealing in the intended Subaru engines.

Why is this product not CARB approved?

This piston ring set is not approved by the California Air Resources Board (CARB). Therefore, it cannot be legally shipped to or installed on vehicles registered in California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 46920DT-1
UPC: 807298101170

Manley Ring Set Subaru EJ205WRX / EJ257 WRX STi 92.0mm File Fit 1.2mm x 1.2mm x 2.8mm - Single

Name: Manley Ring Set Subaru EJ205WRX / EJ257 WRX STi 92.0mm File Fit 1.2mm x 1.2mm x 2.8mm - Single
Brand: Manley Performance
SKU: manley-performance-manley-ring-set-subaru-ej205wrx-ej257-wrx-sti-92-0mm-file-fit-t14-374272
Price: 48.65 USD
Availability: BackOrder

$48.65

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Manley Piston Ring Set for Subaru EJ205/EJ257 WRX/STi. 92.0mm bore size with file-fit top rings.

Key Features

Fits Subaru EJ205WRX and EJ257 WRX STi engines.
92.0mm bore size.
Top ring is file-fit for custom gapping.
Ring dimensions are 1.2mm x 1.2mm x 2.8mm.
Designed for performance and modified engine builds.

⚠️ 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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About this part

Product Details

These Manley piston rings are specifically sized at 92.0mm with a 1.2mm top ring, 1.2mm second ring, and 2.8mm oil ring. This set is designed for Subaru EJ205WRX and EJ257 WRX STi engines, offering a file-fit configuration for the top ring. This means you can precisely gap the rings to your specific engine build, which is crucial for optimal sealing and performance, especially in modified or performance applications.

Manley Performance is known for making well-built engine components, and this ring set is no exception. The file-fit design allows for a custom fit, ensuring a tight seal against the cylinder wall. This helps to prevent blow-by, maintain compression, and keep oil from entering the combustion chamber. Proper ring seal is fundamental for engine health and power output.

Keep in mind that this ring set is not CARB approved and cannot be shipped to California. Always refer to manufacturer instructions for proper installation and gapping procedures.