CP Piston & Ring Set for Mitsubishi 4B11 Evo X - Bore (89mm) - Size (+4.0mm) - CR (8.8) - Set of 4

Forged from high-strength aluminum alloy, this CP Pistons set is built for the demanding needs of a Mitsubishi 4B11 Evo X engine rebuild. These pistons are designed with an 89mm bore and are 4.0mm oversize, intended for engines that have been bored out to accommodate larger pistons. The 8.8:1 compression ratio is carefully chosen to balance power output with reliability, especially when paired with performance camshafts and tuning.

CP Pistons are well-known for their robust construction, utilizing advanced forging techniques to create a piston that can withstand higher cylinder pressures and temperatures than cast alternatives. Each piston in this set of four features a specific skirt design and ring land configuration optimized for the 4B11 engine, ensuring proper sealing and efficient combustion. The included rings are also selected to complement the piston's performance characteristics, contributing to improved oil control and consistent compression across all cylinders.

When rebuilding your 4B11 Evo X engine, especially if you're aiming for increased power or have already modified the block, using a set of forged pistons like these from CP Pistons is a critical step. They offer a solid foundation for a high-performance engine build, providing the durability and reliability needed for spirited driving and track use. Remember to consult your engine builder or service manual for specific installation procedures and recommended clearances, as proper assembly is key to achieving the full benefit of these performance components.