What is the compression height and dish volume of these pistons?

These Manley pistons have a compression height of 1.130 inches and a dish volume of -14.00 CC. This specification is important for achieving the desired compression ratio with your cylinder heads.

Are these pistons suitable for all Subaru WRX/STi models with a 2.5L engine?

This piston set is specifically designed for the EJ257 engine found in certain Subaru WRX and STi models. It's always best to confirm your engine code and verify fitment details to ensure compatibility with your specific vehicle.

What is the advantage of using 2618 alloy forgings?

2618 alloy forgings are chosen for their superior strength and performance characteristics compared to cast aluminum. This makes them well-suited for high-performance and demanding engine applications where durability under stress is critical.

Specifications

Brand: Manley Performance
Part #: 652500C-4
UPC: 807298116723

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.130in CH, -14.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.130in CH, -14.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-50mm-bore-1-13-t14-880153
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.130in CH, -14.00 CC. Forged from 2618 alloy for superior strength.

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 efficient power generation and cylinder wall care.
Includes tool steel wrist pins for added durability.
Ring lands and grooves are machined to exacting standards for enhanced ring seal and power.
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 model and year.

⚠️ 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's 2618 alloy forgings are the backbone of this piston set, offering a strong foundation for your Subaru's 2.5L EJ257 engine. When you're rebuilding the heart of your WRX or STi, especially for performance applications, the quality of the pistons is paramount. These pistons are designed with specific cam and barrel skirt profiles, which help generate power efficiently while also being considerate of your cylinder walls during operation. This attention to detail in the shaping of the piston skirt is something you'll appreciate when it comes time to measure wear.

Beyond the alloy and skirt design, Manley pays close attention to the details that ensure a good seal and long life. The ring lands and grooves are machined to exacting standards, which is crucial for maintaining proper ring seal and maximizing the power your engine can produce. The included wrist pins are made from tool steel, offering solid durability for demanding use. Manley's unique manufacturing process allows them to machine the skirt and cut the ring grooves in a single setup, ensuring the squareness between the piston skirt and the ring grooves. This level of precision is what separates a good rebuild from a great one.

This set is for a 99.50mm bore with a 1.130-inch compression height and a -14.00 CC dish volume. It's important to note that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-performance engine, these Manley pistons are a popular choice among professional engine builders for their proven strength and reliability.