Wiseco KE114M8425 BMW M50B25 2.5L Forged Piston Kit 84.25mm 11:1 CR

The Wiseco KE114M8425 is a complete forged piston kit engineered for the BMW 2.5L M50B25 inline-six engine. Built to Wiseco's exacting tolerances, these pistons are designed for enthusiasts and racers who demand superior strength and thermal stability over stock cast pistons.

Wiseco forges these pistons from high-strength aluminum alloy using their proprietary ArmorGlide skirt coating, which reduces friction and wear for improved longevity under high-performance and forced-induction applications. Each piston is CNC-machined to precise dimensions for a consistent, reliable fit.

Key Features:

• Bore Diameter: 84.25mm (0.25mm oversize)
• Compression Ratio: 11:1 — optimized for naturally aspirated high-performance builds
• Application: BMW 2.5L M50B25 inline-six engine
• Forged from high-strength aluminum alloy for superior strength-to-weight ratio
• CNC-machined for precise fitment and consistent compression across all cylinders
• ArmorGlide skirt coating reduces friction and promotes even oil distribution
• Full kit includes pistons, rings, wrist pins, and retaining clips
• Manufactured in the USA by Wiseco, a trusted name in performance pistons since 1941

The KE114M8425 is an ideal choice for M50B25 engine rebuilds targeting improved power output and reliability, whether for street performance, track days, or all-out competition builds.