Wiseco K626M86AP Forged Piston Kit for 1993-2001 Mitsubishi / DSM 4G63

Vehicle Fitment

• 1993-2001 Mitsubishi 4G63 engine (DSM / 7-bolt crank)
• Lancer Evolution IV-IX (4G63, various generations)

Features

• Forged 2618 aluminum construction for excellent strength
• ArmorGlide® low-friction skirt coating for reduced wear
• Strutted-forge design to improve piston rigidity
• Dished crown (-14.0 cc) to optimize compression ratio
• Precision ring grooves and anti-detonation design
• Forced pin-oiling for reliable lubrication under high RPM
• 22 mm tool-steel wrist pins for durability
• Includes a high-performance piston ring set

Specifications

• Bore: 86.00 mm
• Compression Height: 35.00 mm
• Piston Dish Volume: -14.0 cc
• Compression Ratio: ~8.6:1 (per specialist tuning sources)
• Wrist Pin Diameter: 22 mm
• Piston Material: Forged 2618 aluminum
• Set Quantity: 4 pistons
• Approximate Piston Weight: ~349 g

Included Components

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

Product Description

The Wiseco K626M86AP is a professional-series forged piston kit built for the Mitsubishi 4G63 engine, commonly used in DSM and Lancer Evolution platforms. These pistons are crafted from high-strength 2618 aluminum to handle performance-focused builds.

With a -14.0 cc dished crown, this kit supports a lower compression ratio (around 8.6:1), making it well-suited for boosted or tuned applications. The strutted-forge design increases structural rigidity, while the ArmorGlide® skirt coating helps reduce friction and improve longevity. Forced pin-oiling ensures adequate lubrication for the 22 mm wrist pins under high-stress conditions.

This set includes a premium ring set and is ideal for race, drift, or high-performance street builds. Correct installation - with ring gap checking, clearances, and proper torque settings - is crucial to maximize reliability and performance.