CP Piston & Ring Set for Mitsubishi 1st Gen 4G63 - Bore (85.5mm) - Size (+0.5mm) - Compression Ratio

Starting with a bore size of 85.5mm and an oversize of +0.5mm, these CP Pistons are specifically made for the Mitsubishi 1st Gen 4G63 engine found in your 1990-1992 Eagle Talon, 1990-1992 Mitsubishi Eclipse, and 1990-1992 Plymouth Laser. Forged from high-strength aluminum alloy, these pistons are built to handle the increased demands of a performance-oriented engine build. The forging process creates a denser, more uniform grain structure than cast pistons, making them significantly stronger and more resistant to detonation and thermal stress. This is crucial when you're pushing your engine beyond its original specifications.

CP Pistons are well-known for their precision manufacturing. Each piston in this set is carefully machined to exact tolerances, ensuring a proper fit within the cylinder bore. This precision is key to maintaining optimal compression, sealing, and efficient combustion. The included rings are matched to the pistons and bore size, contributing to a solid seal between the piston and cylinder wall. This seal is vital for preventing combustion gases from escaping into the crankcase and for keeping oil out of the combustion chamber, both of which are critical for engine performance and longevity.

This set is designed for builders looking to maximize the potential of their 4G63 engine. While the specific compression ratio depends on your cylinder head volume, these pistons are engineered to work within a performance-oriented range. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always recommended to consult your engine builder or refer to CP Pistons' technical documentation for detailed installation guidelines and compatibility information with other engine components.