JE Pistons - Set of 4 Mitsubishi 4B11T 90.0mm Bore -9.5 Dome Asymmetrical FSR Pistons - Set of 4

JE Pistons has been a leader in forged racing pistons for over 75 years, building a reputation for durable and high-performance engine components. This set of four pistons is specifically crafted for the Mitsubishi 4B11T engine, featuring a 90.0mm bore and a -9.5 degree dome for a 9.00:1 compression ratio. They are forged in the USA from 2618 aluminum, a material chosen for its high tensile strength, making these pistons well-suited for high-demand performance applications.

These pistons utilize JE Pistons' proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by using a reduced skirt width and a shorter wrist pin, saving additional weight. Depending on the specific application, they may also include an accumulator groove to reduce combustion gas pressure, improving ring seal and preventing ring flutter. A skirt coating, also application-dependent, further reduces friction and wear on the piston skirts and cylinder walls, contributing to quieter operation. Each set includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings, ensuring a complete and well-built package ready for installation.

This piston set is designed for optimal performance and durability in racing applications, from the drift track to the drag strip. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.