Supertech B48 Piston Set for Gen 3 F54 F55 F56 F57 F60 Cooper S with 4 Cylinder B48 engine. These are upgraded performance pistons for someone doing a performance build. They are available in standard 10.2:1 Compression Ratio or 11:1 Compression ratio. And .5mm oversize for bored engine blocks.
Each piston is designed utilizing the latest in CAD software and finite element analysis (FEA) and manufactured from enhanced 4032 alloy. This material features low thermal expansion, excellent wear resistance and a higher thermal conductivity. All of our pistons are created using a 2 or 3 step forging process (depending on the application) which yields the finest structural grain orientation and the strongest piston possible.
Each piston then goes through several heat treatments to ensure high tensile strength and evenly distributes hardness. From there several machining steps take place on specifically designed CMC machines to ensure flatness of the ring grooves.
All supertech pistons feature contact reduction grooves and honed & reamed pin bores for a precise fit.
