Supertech BMW N55/S55 84mm 32.4mm CH 10.2:1 CR Piston - Set of 6 (Excl Rings)

If you're rebuilding the engine in your BMW N55 or S55 and looking for a solid set of pistons to handle increased performance, this Supertech set is a strong contender. These pistons are designed to replace the factory units, offering a 10.2:1 compression ratio, which is a good balance for many performance builds, whether you're staying naturally aspirated or adding forced induction. The 84mm bore size is standard for these engines, ensuring a direct fit into the cylinders.

Supertech uses forged aluminum for these pistons, a material known for its strength and ability to withstand higher cylinder pressures and temperatures compared to cast aluminum. This makes them a reliable choice for engines that will see more demanding use. The pistons feature a 32.4mm compression height, which is crucial for proper valve timing and piston-to-valve clearance when paired with the correct connecting rods. This set includes six pistons, but remember that rings are sold separately, so you'll need to source those to complete the assembly.

When installing these pistons, it's important to follow the manufacturer's recommended clearances and procedures to ensure optimal performance and longevity. Because these are not CARB approved, they cannot be shipped to California. Always consult your engine builder or mechanic for specific recommendations regarding your build.