Wiseco KE115M845 Forged Pistons for 1991-1995 BMW 525i & 1992 BMW 325is

Vehicle Fitment

• 1991-1995 BMW 525i (M50B25 2.5 L 24V I6)
• 1992 BMW 325is (M50B25 2.5 L 24V I6)

Features

• Forged 2618 aerospace-grade aluminum for exceptional strength and durability
• ArmorGlide® coated skirts to reduce friction and improve wear resistance
• Strutted forging construction for reinforced high-stress zones
• 0.50 mm oversize bore (84.50 mm) for rebuilds or high-output applications
• -13.5 cc deep-dish crown to lower compression and improve boost tolerance
• Precision machined valve reliefs and anti-detonation groove for enhanced ring seal
• Floating 22 mm wrist pins included for balanced operation
• Complete kit includes high-performance piston ring set

Specifications

• Bore: 84.50 mm
• Compression height: 38.20 mm
• Piston dish volume: -13.5 cc
• Estimated compression ratio: ~8.8 : 1
• Rod length compatibility: 135 mm (5.315") inline-6
• Wrist-pin diameter: 22 mm (0.866")
• Material: Forged 2618 aluminum
• Piston count: 6 (for inline-6 M50B25 engine)

Included Components

• 6x forged pistons (84.50 mm bore, deep dish)
• 6x floating wrist pins (22 mm)
• 12x circlips / locks for wrist pins
• 1x high-performance piston ring set
• Specification/data sheet

Product Description

The Wiseco KE115M845 piston set is a high-performance forged piston kit built for the BMW M50B25 2.5 L 24-valve engine, used in the 525i (1991-1995) and 325is (1992) models. Designed for rebuilds and high-output applications, the oversized 84.50 mm bore and deep dish crown provide the flexibility to support boosted or built engines.

Constructed from aerospace-grade 2618 aluminum, these pistons feature ArmorGlide® coated skirts to reduce friction and enhance longevity, while the strutted forging adds strength in key stress areas. The -13.5 cc dish crown lowers compression to ~8.8 : 1, making this kit ideal for turbo or nitrous applications where detonation tolerance is critical.

This complete set includes everything needed for a full bottom-end rebuild: six forged pistons, wrist pins, circlips, and a performance ring set. Whether you're building a high-power street machine or a race engine on the M50 platform, the KE115M845 offers a reliable and performance-focused foundation.