CP Piston & Ring Set for Mitsubishi 4G63 2G/Evo 8/9 - Bore 85.5mm - Size +0.5mm - Stroke 88 - CR 9.0

CP Pistons is well-known for making strong internal engine components, and this forged piston and ring set for the Mitsubishi 4G63 engine is a prime example. If you're rebuilding the heart of your 2nd Gen DSM, Evo 8, or Evo 9, these pistons are built to handle the demands of a performance build. They feature a bore size of 85.5mm, which is a +0.5mm overbore from the factory specification, and are designed for an 88mm stroke with a 9.0:1 compression ratio. This setup is ideal for those looking to build a reliable and powerful engine.

These pistons are forged from high-strength aluminum alloy, a material chosen for its excellent strength-to-weight ratio and resistance to extreme temperatures and pressures found in high-performance engines. The forging process creates a denser, more uniform grain structure compared to cast pistons, making them significantly more durable and less prone to failure under stress. The included rings are designed to work seamlessly with the pistons, ensuring proper sealing for optimal compression and oil control. This set is specifically sized for an 88mm stroke, which is important for achieving the correct compression ratio and piston-to-wall clearance.

When undertaking an engine rebuild of this caliber, it's crucial to ensure all components are compatible and installed correctly. This piston set is intended for performance applications and requires careful attention to machining tolerances and assembly procedures. Because these are an overbored piston, the engine block will need to be professionally bored and honed to the exact 85.5mm specification to ensure a proper fit and seal. It's also recommended to consult the manufacturer's installation guide for specific details on ring gap, piston-to-wall clearance, and assembly torque specifications to ensure the longevity and performance of your engine.