What is the compression ratio with this piston?

This piston has a -17cc dish and a 99.5mm bore size, which results in an 8.5:1 compression ratio when used with the appropriate cylinder head volume for the EJ257 engine.

What material are the wrist pins made of?

These pistons come standard with tool steel wrist pins. Manley also offers upgrades to 9310 and Turbo Tuff/DLC alloys for even greater durability.

Are these pistons suitable for a stock engine rebuild?

While these pistons are well-built and feature advanced skirt profiles, their 8.5:1 compression ratio is typically targeted for modified or performance-oriented EJ257 engines, especially those running forced induction. It's always best to consult with your engine builder to ensure they fit your specific build goals.

Specifications

Brand: Manley Performance
Part #: 612200CB-1
UPC: 807298107837

Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)

Name: Manley Subaru EJ257 99.5 Grade B Bore 8.5:1 -17cc Dish Platinum Series Piston (Single Piston)
Brand: Manley Performance
SKU: manley-performance-manley-subaru-ej257-99-5-grade-b-bore-8-5-1-17cc-dish-platinu-t14-223127
Price: 204.36 USD
Availability: BackOrder

$204.36

On Backorder

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Manley Subaru EJ257 99.5mm Platinum Series Piston. Forged from 2618 alloy for improved strength and durability in performance builds.

Key Features

Fits Subaru EJ257 engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features a 99.5mm bore size and a -17cc dish for an 8.5:1 compression ratio.
Includes tool steel wrist pins and moly skirt coating for reduced friction and wear.
Exacting standards for ring lands and grooves ensure enhanced ring seal.
Cam and barrel skirt profiles generate power while being gentle on cylinder walls.

This piston is designed for Subaru EJ257 engines. Please verify compatibility with your specific vehicle and engine build before purchasing.

⚠️ 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

If you're rebuilding the engine in your Subaru EJ257, especially for a performance build, a strong set of pistons is key. These Manley Platinum Series pistons are built to handle the demands of tuners and professional engine builders. They feature a 99.5mm bore size and a -17cc dish, resulting in an 8.5:1 compression ratio, which is a common target for boosted applications where you want to run more boost safely.

Manley uses domestic 2618 alloy forgings for these pistons, giving them solid strength and performance. They also come with tool steel wrist pins and a moly skirt coating to help reduce friction and wear on the cylinder walls. The ring lands and grooves are machined to strict standards for a better seal, and the cam and barrel skirt profiles are designed to generate power while being gentle on the cylinder walls. This attention to detail in machining ensures the ring grooves are square to the skirt, which is important for proper ring seal and overall engine health.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-performance EJ257, these pistons offer a well-built foundation.