Mahle MS BMW S54 B32 87.50mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -29.0cc 9.1CR TBC Coat - Set of 6

Starting with the 2618 aluminum alloy construction, these Mahle forged pistons are built for serious performance in your BMW S54 engine. This material is known for its strength and ability to handle high temperatures and pressures, making it a solid choice for demanding builds. Each piston measures 87.50mm in bore diameter, with a 91.0mm stroke and a 139mm rod length, all designed to work together for optimal engine function. The -29.0cc dish volume contributes to a 9.1:1 compression ratio, a common target for naturally aspirated or moderately boosted S54 builds, offering a good balance between power and drivability.

Mahle has also applied a Thermal Barrier Coating (TBC) to the piston crowns. This advanced coating helps to reflect heat away from the combustion chamber, reducing temperatures and minimizing the risk of detonation, especially under load. The pistons weigh in at 334g each, a carefully managed weight that balances strength with rotational mass. A 21mm wrist pin is specified, ensuring a robust connection between the piston and connecting rod. This set includes all six pistons needed to rebuild your S54 engine, providing a complete solution for your project.

When rebuilding your S54, using a well-made piston set like this from Mahle is crucial for reliability and performance. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine builder's specifications and the manufacturer's installation instructions for proper assembly and break-in procedures.