Wiseco K626M85AP Forged Piston Kit for 1993-2001 Mitsubishi 4G63 (Evo / DSM)

Vehicle Fitment

• Mitsubishi 4G63 engine - used in Lancer Evolution (Evo IV-IX) and DSM applications

Features

• Forged 2618 aluminum construction for high strength
• ArmorPlating® skirt coating to reduce friction and resist wear
• Strutted-forge design for enhanced rigidity
• Dished crown (-14 cc) for a tuned compression ratio
• Precision ring grooves and anti-detonation groove
• Forced pin-oiling for improved lubrication under load
• Tool-steel 22 mm wrist pins for durability
• Includes high-performance ring set (8500XX)

Specifications

• Bore: **85.00 mm**
• Compression Height: **35.00 mm**
• Piston Volume (Dish): **-14.00 cc**
• Compression Ratio: **~8.5:1 / 9.0:1** (varies by source) 
• Wrist Pin Diameter: **22 mm**
• Piston Material: **2618 forged aluminum**
• Piston Set: **4 pistons**
• Ring Set: **8500XX included** 
• Approx. Piston Weight: **~334 g** 

Included Components

• 4x forged pistons
• 4x 22 mm wrist pins
• 1x 8500XX ring set
• Circlips / wrist-pin retainers

Product Description

The Wiseco K626M85AP is a professional-series forged piston kit designed for Mitsubishi's 4G63 engine. These pistons are engineered to handle serious performance loads, making them ideal for Evo and DSM builds. Constructed from 2618 aerospace-grade aluminum, they provide excellent strength and longevity.

With a -14 cc dished crown and a compression ratio around 8.5:1 (or up to ~9.0:1 depending on build), these pistons are tuned for high boost or high-stress applications. The strutted-forge design improves rigidity, while ArmorPlating® on the skirts reduces friction for smoother operation. Forced pin-oiling ensures consistent lubrication to the 22 mm wrist pins under high-stress conditions.

This kit comes with a high-quality 8500XX ring set, providing excellent sealing performance. Ideal for performance engine builders, proper installation - including ring gap checks, clearance verification, and correct torque - is essential for long-term reliability and maximum performance.