What material are these pistons made from?

These Manley pistons are forged from domestic 2618 alloy. This material is chosen for its superior strength and performance capabilities, making it well-suited for demanding engine builds.

Are these pistons suitable for a stock engine rebuild?

While these pistons are built for durability and performance, they are typically used in performance-oriented or modified Subaru 2.5L EJ257 engines. For a stock rebuild, it's best to consult with your engine builder to ensure they are the right choice for your specific application.

What is the significance of the -17.00 CC dish?

The -17.00 CC dish refers to the volume of the indentation on the piston crown. This dish volume affects the compression ratio of the engine. A dish typically lowers the compression ratio, which is often desirable in turbocharged or supercharged applications to prevent detonation.

Specifications

Brand: Manley Performance
Part #: 652800C-4
UPC: 807298116846

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -17.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -17.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-50mm-bore-1-20-t14-880157
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -17.00 CC. Forged from 2618 alloy for superior strength and performance.

Key Features

Fits Subaru 2.5L EJ257 WRX STi engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features proven cam and barrel skirt profiles for power and cylinder wall protection.
Exacting standards for ring lands and grooves ensure enhanced ring seal.
Includes premium chrome moly wrist pins.
Unique fixturing ensures ultimate ring groove to skirt squareness.

This piston set is designed for Subaru 2.5L EJ257 engines. Please verify compatibility with your specific vehicle and engine build.

⚠️ 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

Manley Performance is well-known for building tough engine components, and their "Platinum Series" pistons are a prime example of that commitment. If you're rebuilding a Subaru 2.5L EJ257 engine for a WRX or STi, this set of pistons is built to handle the demands of a high-performance build. They feature a 99.50mm bore, a 1.209-inch compression height, and a -17.00 CC dish, making them a solid choice for serious engine work.

These pistons start with domestic 2618 alloy forgings, which are chosen for their exceptional strength and ability to withstand high cylinder pressures and temperatures. Manley uses proven cam and barrel skirt profiles designed to generate substantial power while also being gentle on your cylinder walls, which helps extend engine life. The ring lands and grooves are machined to very strict standards, ensuring an enhanced ring seal for more efficient combustion and improved power output. This set also includes premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt, a critical detail for proper sealing and performance.

When you're putting together a performance engine, the details matter. This piston set is designed for builders who demand reliability and performance. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always a good idea to consult with your engine builder or refer to Manley's installation guidelines for specific assembly details.