JE Pistons - jep361290 - Ultra Series Mitsubishi EVO VII-IX 4G63 Pistons

Ultra Series forged pistons from JE are the industry’s strongest, most fully featured pistons available off the shelf. Offered for Mitsubishi 4G63 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, Mitsubishi, 4G63 - 01-07 Evolution VII-IX - 22mm Pin, 3.346 in. Bore, 10.00:1, 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 Mitsubishi 4G63 Engines. To provide optimized performance durability
• Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings
• Made 100% in the USA

Brief Description: JE Pistons Ultra Series forged pistons are designed for Mitsubishi 4G63 engines in Evolution VII through IX applications. This four-cylinder piston kit features a 3.346-inch bore, 10.00:1 compression ratio, inverted dome/dish design, 22mm wrist pins, and JE’s Forged Side Relief forging for increased strength.

Key Features & Performance Benefits:

• Aligned Grain Flow Forging: JE’s proprietary forging technology provides increased tensile strength for extreme cylinder pressures in power-adder engine builds.
• Accumulator Groove: Adds volume for blow-by gases to help reduce inter-ring pressure, improve top-ring seal, and minimize ring flutter at high cylinder pressures.
• Lateral Gas Ports: Provide a pathway for combustion pressure behind the top ring to support increased 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
• Application: Mitsubishi 4G63 engines
• Fitment: 2001–2007 Mitsubishi Evolution VII–IX
• Bore: 3.346 inches
• Compression ratio: 10.00:1
• Wrist pin diameter: 22mm
• Configuration: Four-cylinder piston kit with inverted dome/dish design

What’s Included in the Box: Four forged pistons, high-quality wrist pins, locks, and JE Pro Seal premium piston rings. The pistons are made in the USA. This product is not CARB approved, and California Proposition 65 requirements apply.

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