CP Piston BMW N20B20/N55B30/S55B30 (4 Cyl) 84mm Bore -9.7cc STD Piston - Set of 4

CP Pistons is well-known for building strong, reliable internal engine components for performance applications. This set of four forged pistons is designed for BMW engines like the N20B20, N55B30, and S55B30, offering a solid foundation for engine builds where durability and performance are key. Each piston features an 84mm bore and a -9.7cc dish, which is a standard configuration for many performance builds aiming to optimize compression ratios.

Forged pistons are a significant upgrade over cast pistons, as they are made from a solid block of aluminum that is heated and hammered into shape. This process creates a much stronger and more durable piston that can withstand higher cylinder pressures and temperatures. This makes them ideal for engines that are modified for increased power output or subjected to demanding use. The 84mm bore size is specific to these BMW engine families, ensuring a proper fit within the cylinders. The -9.7cc dish is a common design feature that helps control the compression ratio, especially when paired with different cylinder head configurations or gasket thicknesses.

This set includes four pistons, along with the necessary components for installation. When rebuilding an engine, it's crucial to ensure all components are compatible and installed correctly. Always refer to the manufacturer's detailed installation instructions for proper fitment and assembly procedures to get the most out of these high-performance pistons.