JE Pistons JEP361319 Ultra Series Subaru EJ205 92.5mm Bore 8.5:1 CR Set of 4 Pistons

Ultra Series forged pistons from JE are the industry’s strongest, most fully featured pistons available off the shelf. Offered for Subaru WRX EJ205 Engines. Ultra Series Pistons feature JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with the following custom level features JE Ultra, Subaru, EJ Series, 3.642 in. Bore, 8.50:1, Inverted Dome/Dish, 4 Cyl. Piston Kit These pistons utilize our dedicated Forged Side Relief (FSR) forging that was specifically designed to increase strength.

• Accumulator Groove: A specialty groove between the top and second ring provides added volume for blow-by gases. This helps reduce pressure between the rings, improving top ring seal and minimizing ring flutter at high cylinder pressures.
• Lateral Gas Ports: This process mills slots into the top of the top ring groove and provides a pathway for combustion pressure to get behind the top ring. Resulting in increased ring seal and is most common in circle track applications.
• Thermal Crown: Applied to the piston crown, this thermal barrier coating reflects heat back into the combustion chamber to improve exhaust gas velocity and scavenging while reducing heat transfer to help extend piston life.
• JE’s proprietary Aligned Grain Flow forging technology providing next-level tensile strength ideal for the extreme cylinder pressures of power adder engine builds.
• Pin Fit: The pin bore is precision honed to attain an exact pin clearance. Clearances typically range from .0003 to .0010 between the wrist pin and pin bore.
• Skirt Coat: Skirt Coat reduces friction and wear on piston skirts and cylinder walls while simultaneously reducing operating noise
• Smooth Crown Finish: Deburs all areas around the valve pocket and dome area, to reduces stress risers and prevent hot spots.
• Designed specifically for Subaru WRX EJ205 Engines. To provide optimized performance durability
• Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
• Made 100% in the USA

JE Pistons Ultra Series forged pistons are designed specifically for Subaru WRX EJ205 engines and feature a 92.5 mm bore with an 8.5:1 compression ratio. Their inverted dome/dish design and Forged Side Relief forging support demanding power-adder engine builds where increased strength and durability are important.

Key Features & Performance Benefits

• Aligned Grain Flow forging: JE’s proprietary forging technology provides increased tensile strength for extreme cylinder pressures.
• Accumulator groove: Adds volume for blow-by gases to help reduce pressure between the rings, improve top-ring seal, and minimize ring flutter.
• Lateral gas ports: Provide a pathway for combustion pressure behind the top ring to increase ring seal.
• Thermal crown and skirt coating: The thermal barrier coating helps reduce heat transfer, while the skirt coating reduces friction, wear, and operating noise.

Key Product Specifications & Technical Data

• Brand: JE Pistons
• Series: Ultra Series
• Part number: JEP361319
• Application: Subaru WRX EJ205 engines
• Bore: 92.5 mm, equivalent to 3.642 inches
• Compression ratio: 8.5:1
• Piston design: Inverted dome/dish
• Engine configuration: 4-cylinder

What’s Included

The set includes four pistons, high-quality wrist pins, locks, and JE Pro Seal premium piston rings. Additional features include precision-honed pin bores, a smooth crown finish, and 100% U.S. manufacturing. Fitment is listed for Subaru WRX EJ205 engines.

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: false
Units Per Sku: 1