What is the advantage of using forged pistons over cast pistons?

Forged pistons, like these from Manley, are made from a solid block of alloy that is heated and hammered into shape. This process creates a much stronger and more durable piston that can withstand higher cylinder pressures and temperatures compared to cast pistons, making them ideal for performance and racing applications.

What is the significance of the -17.00 CC dish volume?

The dish volume in the piston crown affects the engine's compression ratio. A negative CC value, like -17.00, indicates a dish shape that removes volume from the combustion chamber, which is used to lower the compression ratio. This is important when building a performance engine to ensure it runs reliably on the intended fuel and to prevent detonation.

Are rings and connecting rods included with this piston set?

This product listing is for the Manley piston set only. Rings and connecting rods are sold separately. You will need to select compatible rings and connecting rods to complete your engine build.

Specifications

Brand: Manley Performance
Part #: 652802C-4
UPC: 807298116280

Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -17.00 CC

Name: Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore 1.209in CH, -17.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-subaru-2-5l-ej257-wrx-sti-piston-set-99-75mm-bore-1-20-t14-880161
Price: 827.84 USD
Availability: BackOrder

$827.84

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Manley Subaru 2.5L EJ257 WRX STi Piston Set - 99.75mm Bore. Built with 2618 alloy forgings for superior strength and durability in high-performance engines.

Key Features

Fits Subaru 2.5L EJ257 WRX STi engines.
Forged from domestic 2618 alloy for superior strength and performance.
99.75mm bore size is a common upgrade for enhanced displacement.
Features a 1.209-inch compression height and -17.00 CC dish volume.
Includes premium chrome moly wrist pins for added durability.
Ring lands and grooves are precisely machined for enhanced ring seal and power.

This piston set is designed for Subaru 2.5L EJ257 engines. Compatibility with other Subaru models or engine variants should be confirmed with manufacturer specifications.

⚠️ 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 has a solid reputation among professional engine builders and tuners for making strong, reliable engine components, and this piston set for the Subaru 2.5L EJ257 WRX STi is no exception. If you're rebuilding the heart of your performance Subaru, these pistons are built to handle the demands of a tuned engine. They feature a 99.75mm bore size, which is a common upgrade size for these engines, and a 1.209-inch compression height with a -17.00 CC dish volume, designed to work with specific head and gasket combinations to achieve your desired compression ratio.

What sets these pistons apart is the material and construction. They're forged from domestic 2618 alloy, a material known for its exceptional strength and ability to withstand high temperatures and pressures without deforming. This is crucial for performance applications where stock cast pistons might fail. Manley also pays close attention to the details that matter for sealing and longevity. The ring lands and grooves are machined to strict standards, which helps ensure a tight seal for maximum power and reduced blow-by. The skirt profiles are carefully shaped to reduce friction against the cylinder walls while still generating significant power. Plus, they come standard with premium chrome moly wrist pins for added durability, and Manley's unique manufacturing process ensures the ring grooves are perfectly square to the piston skirt for optimal performance.

When you're building a high-performance engine like the EJ257, using components that are built to last is essential. This piston set is designed for those who are pushing the limits of their Subaru. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a complete build, you'll want to ensure you have the correct supporting components like rings, connecting rods, and bearings that are compatible with these 99.75mm pistons.