Wiseco BMW M50B25 2.5L Engine 11:1 CR 85MM Bore Custom Pistons (Set of 6)

If you're rebuilding the engine in your 1991-1995 BMW 525i, 1992 325is, or 1993 525iT, this set of six Wiseco forged pistons is designed for serious performance builds. These pistons are made from 2618 aluminum, which offers improved tensile strength, making them well-suited for heavy to severe duty applications where durability is key. The 85mm bore and 11:1 compression ratio are specific to the M50B25 engine, aiming to increase power output when paired with appropriate supporting modifications.

Wiseco has packed these pistons with features to ensure reliable performance. You get precision-machined ring grooves, anti-detonation grooves, and additional features designed to improve ring seal. The crown is fully machined, and the pistons include forced pin oiling to keep the wrist pins lubricated under high stress. Additionally, they feature an ArmorGlide skirt coating, which helps reduce friction, resist seizure, and operate more quietly. These pistons are forged and machined in the USA, reflecting a commitment to quality construction for demanding engine builds.

This set includes six pistons, the necessary rings, and wrist pins, ready for installation. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.