Wiseco K626M855AP Forged Piston Kit for 1993-2001 Mitsubishi 4G63 (Evo/DSM)

Vehicle Fitment

• 1993-2001 Mitsubishi 4G63 engine (Lancer Evolution I-III, DSM 4G63 applications)

Features

• Forged 2618 aluminum for high strength and durability
• Low-friction skirt coating to reduce wear
• Strutted-forge design for enhanced rigidity
• Dished crown (-14 cc) for controlled compression ratio
• Precision ring grooves for optimal sealing
• Forced pin-oiling for reliable lubrication under high stress
• Heavy-duty 22 mm wrist pins for durability
• Professional-grade performance ring set included

Specifications

• Bore: 85.50 mm
• Compression Height: 35.00 mm
• Piston Dish Volume: -14 cc
• Compression Ratio: ~8.5:1
• Wrist Pin Diameter: 22 mm
• Piston Material: Forged 2618 aluminum
• Piston Set Quantity: 4
• Average Piston Weight: ~341 g

Included Components

• 4x forged pistons
• 4x 22 mm wrist pins
• 1x high-performance piston ring set
• Circlips / wrist-pin retainers

Product Description

The Wiseco K626M855AP is a high-performance forged piston kit built for the Mitsubishi 4G63 engine. Designed for Lancer Evolution I-III and DSM applications, these pistons deliver exceptional strength and durability for high-RPM and high-boost builds.

The -14 cc dished crown provides a lower compression ratio (~8.5:1), making it ideal for forced-induction or tuned naturally aspirated setups. The strutted forging design increases rigidity, while the low-friction skirt coating reduces wear. Forced pin-oiling ensures reliable lubrication for the 22 mm wrist pins under heavy loads.

This kit includes a performance-grade piston ring set and is suitable for track, drift, or high-power street builds. Correct installation, including ring gap verification, clearance checks, and torque specification adherence, is essential to maximize durabilit