Wiseco BMW S50B32 3.2L 24V Turbo Bore (86.5mm)-Size (+.10)-CR (11.3) Std Comp Pistons SPECIAL ORDER

Starting with a 2618 aluminum forging, these Wiseco pistons are built for the demanding S50B32 3.2L engine found in the 1996-1999 BMW M3. The 86.5mm bore size, combined with a 32.20mm compression height and an 11.3:1 compression ratio, is specifically chosen for builds aiming for significant power gains, especially when turbocharging. These aren't your average replacement parts; they're designed for heavy to severe duty performance applications where reliability under stress is paramount.

Wiseco machines these pistons in the USA, ensuring precision throughout the manufacturing process. You'll find features like precision ring grooves, anti-detonation grooves, and additional ring seal improvements to help manage combustion pressures and prevent blow-by. The crown is fully machined for a clean combustion chamber, and the piston pin bores are designed for forced pin oiling, which is crucial for keeping the wrist pin lubricated under high loads. Plus, the ArmorGlide skirt coating helps reduce friction, resist seizure, and operate more quietly, which is a notable benefit in high-performance engines.

This set includes six pistons, the correct amount for your M3's inline-six engine. Keep in mind that these pistons are a special order item and are not CARB approved, meaning they cannot be shipped to California. For serious engine builds, these Wiseco pistons offer a well-built foundation for pushing your S50B32 engine's limits.