What does the +0.5mm oversize mean for my engine?

An oversize piston ring set, like this +0.5mm set, is used when the engine's cylinder walls have been machined (bored) to a larger diameter than stock. This allows for a fresh, properly sized surface for the rings to seal against, especially if the original cylinders were worn or damaged.

What are the dimensions of these piston rings?

This Manley ring set features a 1.2mm top ring, a 1.2mm second ring, and a 2.8mm oil ring. These specific dimensions are crucial for proper sealing and oil control within the cylinder.

Can I ship this part to California?

No, this part is not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 46925-4
UPC: 807298042046

Manley Subaru WRX EJ205/WRX STi EJ257 92.5mm Bore +0.5mm Oversize Bore 1.2mmx1.2mmx2.8mm Ring Set

Name: Manley Subaru WRX EJ205/WRX STi EJ257 92.5mm Bore +0.5mm Oversize Bore 1.2mmx1.2mmx2.8mm Ring Set
Brand: Manley Performance
SKU: manley-performance-manley-subaru-wrx-ej205-wrx-sti-ej257-92-5mm-bore-0-5mm-overs-t14-269509
Price: 194.61 USD
Availability: BackOrder

$194.61

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Fits 2002-2005 Subaru Impreza WRX EJ205/WRX STi EJ257. Manley 92.5mm bore, +0.5mm oversize piston ring set for engine rebuilds.

Key Features

Fits 2002-2005 Subaru Impreza WRX EJ205 and WRX STi EJ257.
Manley Performance piston ring set.
Designed for a 92.5mm bore size.
This is a +0.5mm oversize ring set.
Features 1.2mm top ring, 1.2mm second ring, and 2.8mm oil ring dimensions.
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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About this part

Product Details

This is a Manley Performance piston ring set specifically for the 2002-2005 Subaru Impreza WRX EJ205 and WRX STi EJ257 engines. If you're rebuilding your engine, new piston rings are a critical part of ensuring proper compression and sealing between the piston and cylinder wall. This set is designed for a 92.5mm bore, which is a +0.5mm oversize from the factory specification.

Manley is known for making well-built internal engine components, and this ring set is no exception. The rings feature a 1.2mm top ring, 1.2mm second ring, and a 2.8mm oil ring. This specific sizing and configuration is important for achieving optimal performance and durability in these turbocharged Subaru engines. Using the correct oversize rings is essential when cylinder walls have been bored out to match.

Please note that this part is not CARB approved and cannot be shipped to California. Always refer to your vehicle's service manual or a trusted mechanic for proper installation procedures and specifications.