What is the purpose of the moly skirt coating on these pistons?

The moly skirt coating helps to reduce friction between the piston skirt and the cylinder wall. This can lead to less wear over time and potentially improved engine efficiency.

What does the -10.00 CC dish volume mean for my engine build?

The dish volume affects the compression ratio of your engine. A -10.00 CC dish typically lowers the compression ratio, which is often desirable when increasing boost pressure in turbocharged engines to prevent detonation.

Are these pistons compatible with all EJ257 engines?

These pistons are specifically designed for the 2.5L EJ257 engine with a 99.50mm bore. It's important to verify that this bore size and dish volume match your specific engine build requirements and cylinder head configuration.

Specifications

Brand: Manley Performance
Part #: 652300CE-4
UPC: 807298116501

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -10.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -10.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-50mm-bore-1-20-t14-880146
Price: 963.51 USD
Availability: BackOrder

$963.51

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.50mm Bore 1.209in CH, -10.00 CC. Forged from 2618 alloy for superior strength in high-performance builds.

Key Features

Fits Subaru 2.5L EJ257 WRX and STi engines.
Forged from domestic 2618 alloy for superior strength and performance.
Features a 99.50mm bore size, 1.209-inch compression height, and -10.00 CC dish volume.
Includes moly skirt coating to reduce friction and wear on cylinder walls.
Cam and barrel skirt profiles are designed for efficient power generation and reduced cylinder wall stress.
Exacting standards for ring lands and grooves ensure enhanced ring seal and power.

These pistons are designed for Subaru 2.5L EJ257 engines. Always consult manufacturer specifications for compatibility with your specific vehicle and 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

If you're rebuilding the engine in your Subaru WRX or STi with the 2.5L EJ257 engine, choosing the right pistons is critical for handling increased boost and power. These Manley Performance pistons are built for those demanding applications, offering a solid foundation for a high-performance engine build. They feature a 99.50mm bore size, a 1.209-inch compression height, and a -10.00 CC dish volume, designed to work with specific cylinder head configurations.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their strength and ability to withstand high temperatures and pressures common in tuned or racing engines. They also come with a moly skirt coating, which helps reduce friction and wear on the cylinder walls during break-in and operation. The cam and barrel skirt profiles are carefully shaped to generate power efficiently while minimizing stress on the cylinder walls. You'll also find exacting standards applied to the ring lands and grooves, which is key for a good seal and maximizing power output from your engine.

These pistons come standard with premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the piston skirt. This attention to detail contributes to overall engine reliability and performance. Please note that these pistons are not CARB approved and cannot be shipped to California. For a successful rebuild, always refer to the manufacturer's installation instructions and ensure you have the correct supporting components.