JE Pistons Ultra Series Subaru EJ257 99.75mm Bore 9.5:1 Compression Set of 4 Pistons

Description

The JE Pistons Ultra Series for Subaru EJ257 engines offers industry-leading forged pistons designed for high-performance applications. Featuring a 99.75mm bore and a compression ratio of 9.5:1, these pistons are engineered to withstand extreme cylinder pressures associated with turbocharged and power-adder builds. Crafted with JE’s proprietary Aligned Grain Flow forging technology, these pistons deliver exceptional tensile strength, making them ideal for demanding racing and high-horsepower street engines. This advanced forging process ensures consistent grain alignment, resulting in increased durability and resistance to failure under high-stress conditions.
Built for high-performance engine environments, the Ultra Series pistons come equipped with a thermal barrier crown coating that reflects heat into the combustion chamber, reducing piston crown temperatures and enhancing overall combustion efficiency. The inclusion of skirt coating minimizes friction and wear on piston skirts and cylinder walls, while also reducing cold start noise, contributing to smoother engine operation. Designed with precision, each piston features lateral gas ports that help maintain optimal ring seal at high RPMs and boost pressures, ensuring consistent power delivery.
Complementing these features are high-strength wrist pins manufactured by Trend Performance in the USA, engineered to withstand the rigors of high-power applications. The pistons also incorporate optimized pin oiling to reduce heat buildup and friction, extending component lifespan. With a focus on power and reliability, every aspect of the Ultra Series pistons is tailored for high-horsepower racing engines, making them a reliable choice for serious enthusiasts. Crafted entirely in the USA, these pistons meet demanding standards and are ideal for turbocharged Subaru EJ257 builds seeking maximum strength and performance.
Note that these pistons are not CARB-approved and require proper acknowledgment before installation. They are suitable for air freight shipping and are part of JE Pistons’ extensive lineup of high-performance automotive components, emphasizing quality and durability for extreme engine applications.

Features:

• Aligned Grain Flow Technology: Proprietary forging process maximizes tensile strength for high-stress environments

• Thermal Barrier Crown Coating: Reflects heat into the combustion chamber to reduce piston crown temperatures

• High-Strength Wrist Pins: Manufactured by Trend Performance for durability under high-power conditions

• Skirt Coating: Reduces friction, wear, and cold start noise for smoother engine operation

• Optimized Pin Oiling: Enhances lubrication to lower heat, friction, and wear on piston pins

• Lateral Gas Ports: Maintains optimal ring seal at high RPM and boost levels

• Engineered for Power: Designed specifically for high-horsepower racing and turbocharged engines

• Made in the USA: Ensures quality and consistency throughout the manufacturing process