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 ability to perform under high-stress conditions common in performance engines.

Are these pistons compatible with all Subaru 2.5L engines?

These pistons are specifically designed for the EJ257 engine found in certain Subaru WRX and STi models. It's important to verify your specific engine code to ensure compatibility, as other 2.5L variants may have different requirements.

What is the significance of the -14.00 CC dish volume?

The -14.00 CC dish volume refers to the shape and depth of the piston crown. This specification is critical for determining the engine's compression ratio when paired with specific cylinder heads and head gasket thickness.

Specifications

Brand: Manley Performance
Part #: 652505C-4
UPC: 807298116808

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.130in CH, -14.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.130in CH, -14.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-100-00mm-bore-1-1-t14-880127
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 100.00mm Bore 1.130in CH, -14.00 CC. Forged from 2618 alloy for superior strength and performance.

Key Features

Fits Subaru 2.5L EJ257 engines.
Forged from domestic 2618 alloy for superior strength and performance.
100.00mm bore size.
1.130 inch compression height.
-14.00 CC dish volume.
Features proven cam and barrel skirt profiles for efficient power generation and reduced cylinder wall wear.

⚠️ 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 robust engine components, and their Subaru 2.5L EJ257 piston set is a prime example of that commitment. If you're rebuilding the heart of your WRX or STi and need pistons that can handle serious power, these are a solid option. They're designed for a 100.00mm bore, with a 1.130-inch compression height and a -14.00 CC dish, making them suitable for many high-performance builds.

These pistons are forged from domestic 2618 alloy, a material chosen for its exceptional strength and ability to withstand high temperatures and pressures. Manley also uses proven cam and barrel skirt profiles, which help generate power efficiently while being kinder to your cylinder walls during operation. The ring lands and grooves are machined to exacting standards, which is crucial for achieving a tight ring seal and maximizing combustion efficiency. Standard with these pistons are chrome moly wrist pins, known for their durability, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt, contributing to overall engine health and performance.

It's important to note that these pistons are not CARB approved and cannot be shipped to California. When planning your build, consider that these are a component for a larger engine assembly, and professional installation is recommended to ensure proper fitment and performance. They are designed to be a direct replacement for the specified engine size, but always consult with your engine builder or refer to Manley's technical documentation for specific application details and recommended clearances.