CP Piston & Ring Set for Mitsubishi 4G63 2G/Evo 8/9 - Bore 85.5mm - Size +0.5mm - Stroke 88 - CR 10

This kit includes a set of four forged pistons and the necessary piston rings to rebuild the engine in your Mitsubishi 4G63 2G, Evolution 8, or Evolution 9. These pistons are specifically sized for an 85.5mm bore, which is a +0.5mm overbore from the stock dimension, and are designed to work with an 88mm stroke. They feature a 10:1 compression ratio, making them a solid choice for builds aiming for improved performance without going too extreme on compression.

CP Pistons are well-known for their robust construction, and these are no exception. Forged from high-strength aluminum alloy, these pistons are built to withstand the higher cylinder pressures and temperatures found in modified or performance-oriented 4G63 engines. The forged process creates a denser, stronger piston compared to cast alternatives, offering improved durability and resistance to detonation. The included rings are designed to seal properly against the cylinder wall and the piston, ensuring good compression and oil control.

When rebuilding an engine, especially one known for performance like the 4G63, using quality internal components is crucial. These CP pistons are a popular choice for enthusiasts looking to refresh or upgrade their engine internals. Remember that an overbore like this requires machining the engine block to the specified bore size. Always refer to the manufacturer's installation instructions for proper assembly and break-in procedures to ensure the longevity of your rebuild.