What makes the 2618 alloy beneficial for these pistons?

The 2618 alloy is chosen for its exceptional strength and ability to withstand high temperatures and pressures. This makes it well-suited for performance engines that experience significant stress, contributing to the pistons' durability and reliability under demanding conditions.

What is the purpose of the cam and barrel skirt profiles?

These specific skirt profiles are designed to help the piston operate smoothly and quietly within the cylinder bore. They also help to minimize friction and wear on the cylinder walls, contributing to the longevity of the engine build.

Are any other wrist pin materials available?

While these pistons come standard with premium chrome moly wrist pins, Manley offers upgrades to 9310 and Turbo Tuff/DLC alloys for select part numbers, providing even greater durability for extreme applications.

Specifications

Brand: Manley Performance
Part #: 632801C-4
UPC: 807298109022

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.55mm Bore 1.209in CH, -17.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.55mm Bore 1.209in CH, -17.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-55mm-bore-1-20-t14-880138
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.55mm Bore 1.209in CH, -17.00 CC. Built with 2618 alloy for serious engine builds.

Key Features

Fits Subaru 2.5L WRX STi EJ257 engines.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Features proven cam and barrel skirt profiles for smooth operation and reduced cylinder wall wear.
Precisely machined ring lands and grooves ensure enhanced ring seal and power.
Includes premium chrome moly wrist pins for added durability.
Unique fixturing ensures ultimate ring groove to skirt squareness.

This piston set is designed for Subaru 2.5L EJ257 engines. It is not CARB approved and cannot be shipped 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

Starting with domestic 2618 alloy forgings, these Manley pistons are built for the demanding needs of Subaru 2.5L EJ257 engines found in WRX STi models. With a bore size of 99.55mm, a 1.209-inch compression height, and a -17.00 CC dish volume, they are designed to handle significant power increases and the stresses that come with them. The choice of 2618 alloy is key here; it's known for its strength and ability to withstand high temperatures and pressures, making it a popular material for performance engine components.

Manley doesn't stop at the material. These pistons feature proven cam and barrel skirt profiles, which help them run smoothly and quietly while minimizing wear on your cylinder walls. The ring lands and grooves are machined to strict standards, ensuring a solid seal for improved power output. For added durability, they come equipped with premium chrome moly wrist pins, and Manley's unique fixturing process allows for precise machining of the skirt and ring grooves in one operation, guaranteeing their squareness for optimal performance.

If you're rebuilding or significantly upgrading your Subaru's EJ257 engine, these pistons are a solid choice. They are designed to work with performance engine builders and tuners who demand reliability and power. Keep in mind that these are not CARB approved and cannot be shipped to California. For a complete build, you'll want to ensure you have all the necessary supporting components and follow the manufacturer's installation guidelines carefully.