Mahle MS Piston Set S54 B32 3.2L 87.25mm Bore 91mm Stroke 139mm Rod 21mm Pin-13.1cc 11.6 CR Set of 6

This Mahle MS Piston Set includes six forged pistons designed for the BMW S54 3.2L engine. Each piston measures 87.25mm in bore diameter, with a 91mm stroke and a 139mm rod length. The set also includes 21mm wrist pins and features a -13.1cc dish volume, resulting in a 11.6:1 compression ratio. These pistons are constructed from 2618 aluminum, a strong and lightweight material commonly used in high-performance applications. Each piston weighs 340g, contributing to a well-balanced rotating assembly. This set is ideal for builders looking to refresh or upgrade their S54 engine with well-built internal components.

The Mahle MS pistons are forged from 2618 aluminum, a material known for its strength and ability to withstand high temperatures and pressures found in performance engines. This forging process creates a denser, stronger piston than cast alternatives, making them suitable for demanding builds. The specific dish volume and pin height are engineered to achieve the 11.6:1 compression ratio when paired with the S54's stock stroke and rod length, offering an improved performance curve without requiring extensive modifications to the cylinder head or block. The included 21mm wrist pins are also robust, designed to handle the increased stress.

When rebuilding or modifying your S54 engine, using a matched set of pistons like these from Mahle ensures consistency across all cylinders. This uniformity is crucial for smooth engine operation and optimal power delivery. Please note that this piston set is not CARB approved and cannot be shipped to California. It is recommended to consult with your engine builder or refer to Mahle's technical documentation for specific installation guidelines and compatibility with other engine components.