What does '+.5mm oversized' mean for these piston rings?

This means the rings are designed to fit pistons that have been machined to a larger bore size of 86.5mm, which is 0.5mm larger than the standard bore size. This is common during engine rebuilds where the cylinder walls are honed or bored to ensure a fresh, round surface.

Are these piston rings compatible with all 2015-2019 Subaru WRX models?

These rings are specifically designed for the FA20 engine found in the 2015-2019 Subaru WRX. They are also intended for use with pistons that have been bored to 86.5mm and are +.5mm oversized.

Why are these rings not CARB approved?

Some engine components may not meet California Air Resources Board (CARB) emissions standards. As a result, this product cannot be shipped to California due to these regulations.

Specifications

Brand: Manley Performance
Part #: 46866DT-4
UPC: 807298101101

Manley 15-19 Subaru WRX FA20 86.5mm Bore 1.2mm x 1.5mm x 3.0mm +.5mm Oversized Ring Set

Name: Manley 15-19 Subaru WRX FA20 86.5mm Bore 1.2mm x 1.5mm x 3.0mm +.5mm Oversized Ring Set
Brand: Manley Performance
SKU: manley-performance-manley-15-19-subaru-wrx-fa20-86-5mm-bore-1-2mm-x-1-5mm-x-3-0m-t14-309623
Price: 184.03 USD
Availability: BackOrder

$184.03

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Performance piston ring set for 2015-2019 Subaru WRX FA20. Features 86.5mm bore, +.5mm oversized.

Key Features

Fits 2015-2019 Subaru WRX FA20.
Piston ring set for 86.5mm bore.
Rings are +.5mm oversized.
Top ring thickness is 1.2mm.
Second ring thickness is 1.5mm.
Oil control ring thickness is 3.0mm.

This piston ring set is designed for the 2015-2019 Subaru WRX with the FA20 engine. It is specifically for engines bored to 86.5mm and uses +.5mm oversized rings.

⚠️ 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 product is a set of piston rings for your 2015-2019 Subaru WRX with the FA20 engine. You get a complete set of rings designed to fit pistons with an 86.5mm bore. These rings are +.5mm oversized, meaning they are intended for use with pistons that have been bored out to that specific size during an engine rebuild.

Manley is known for making well-built engine components, and this ring set is no exception. The rings feature a specific thickness profile: 1.2mm for the top ring, 1.5mm for the second ring, and 3.0mm for the oil control ring. This combination is chosen to ensure a good seal between the piston and cylinder wall, which is critical for engine performance and longevity. The tabs on the rings help with proper orientation during installation.

It's important to note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's service manual for proper installation procedures and specifications when rebuilding your engine.