Mahle MS Piston Set BMW S54B 87.25mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -9.2cc 12.5 CR Set of 6

This Mahle MS Piston Set includes six pistons designed for the BMW S54 3.2L engine. Each piston features an 87.25mm bore, a 91.0mm stroke, and is built to accommodate a 139mm connecting rod with a 21mm wrist pin. With a -9.2cc dish volume, these pistons are engineered to achieve a 12.5:1 compression ratio, making them a solid choice for engine builds seeking improved performance. Each piston weighs in at 354g, with a 32.3mm compression height (CH).

Crafted from 2618 aluminum, a material known for its strength and durability under high stress, these Mahle pistons are well-built for demanding applications. The precise machining and material selection aim to ensure reliable performance and longevity in your S54 engine. The 12.5:1 compression ratio is a notable increase over stock, which can contribute to improved power output when paired with appropriate tuning and supporting modifications. This set is designed as a direct replacement for the factory pistons, simplifying installation for a professional rebuild.

When undertaking an engine rebuild for your BMW S54, using high-performance internal components like these Mahle pistons is crucial for achieving your desired results. It's important to note that this piston set is not CARB approved and cannot be shipped to California. Always consult with your engine builder or a qualified mechanic to ensure these pistons are the right fit for your specific build goals and that all supporting components are compatible.