Mahle MS Piston Set S54 B32 3.2L 87.5mm Bore 91mm Stroke 139mm Rod 21mm Pin-13.1cc 11.6 CR Set of 6

Starting with a 2618 aluminum alloy, these Mahle MS pistons are built for high-performance engines. This specific set is designed for the BMW S54 3.2L engine, featuring an 87.5mm bore and a 91mm stroke, which are critical dimensions for maintaining the correct displacement and compression ratio. The 139mm rod length and 21mm pin diameter are also key specifications that ensure proper fitment and load transfer within the engine's rotating assembly.

Each piston in this set has a dish volume of -13.1cc, contributing to an 11.6:1 compression ratio when paired with the appropriate cylinder head and gasket. This compression ratio is a notable increase over stock, designed to extract more power from the S54 engine. The pistons themselves weigh 343g, a balance that helps manage reciprocating mass for improved engine response without compromising strength. Mahle's expertise in piston manufacturing means these are well-built components intended for demanding applications where reliability and performance are paramount.

This set includes six pistons, enough for a complete engine rebuild. 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 fitting and assembly procedures, especially when dealing with critical engine components like pistons.