Wiseco KE118M845 84.5mm Forged Piston Set for 1998-2000 BMW 323i/323Ci/Z3 2.5L

Vehicle Fitment

• 1998-2000 BMW 323i (E46, 2.5L M52TUB25)
• 1999-2000 BMW 323Ci (E46, 2.5L M52TUB25)
• 1998-2000 BMW Z3 2.3i/2.5i (E36/7, 2.5L M52TUB25)
• 1998-2000 BMW 523i (E39, 2.5L M52TUB25)

Fitment Notes

• Fits M52TUB25 engines with double VANOS (Technical Update version)
• Does not fit earlier 1995-1998 E36 323i models with M52B25 engine
• Does not fit E36 323is (1998-1999) with different engine configuration
• Designed for aluminum block M52TU engines with cast iron cylinder liners

Features

• Engineered, forged, and machined in the USA from high-strength 2618 aluminum alloy for improved tensile strength and heat resistance
• ArmorGlide skirt coating minimizes friction, reduces wear, and provides quieter operation while improving seizure resistance
• Professional Series construction designed for heavy to severe duty racing and high-performance builds with no-expense-spared engineering
• Optimized for turbocharged and supercharged applications, capable of handling extreme mechanical stress and high heat conditions
• Premium ring design with precision-engineered compression and oil control rings for optimal sealing and reduced blow-by
• Lightweight construction reduces reciprocating mass while maintaining superior strength and durability compared to stock cast pistons
• Custom-level performance features including optimized ring grooves and compression heights for maximum power and reliability
• Complete piston set manufactured to exact tolerances for precise fitment and optimal engine balance

Specifications

• Bore: 84.5mm (overbore)
• Compression Ratio: 8.8:1
• Stroke: 75.0mm
• Rod Length: 140.00mm
• Compression Height: 32.7mm
• Dome Volume: -5cc (dish)
• Piston Weight: 293 grams each
• Pin Diameter: 22mm (0.8661 inches)
• Material: 2618 forged aluminum alloy
• Set of 6 pistons (complete engine set)

Included Components

• 6x Wiseco Professional Series forged pistons with ArmorGlide coating
• 6x Premium piston ring sets (compression and oil control rings)
• 6x Chromium alloy steel wrist pins
• 12x Spirolox retaining clips

Product Description

The Wiseco KE118M845 Professional Series forged piston set represents the pinnacle of performance engineering for the BMW M52TUB25 2.5-liter inline-six engine. Designed specifically for serious racers and high-performance builders, these pistons are manufactured entirely in the USA using advanced forging processes and 2618 aluminum alloy, providing exceptional strength-to-weight ratios and superior heat resistance compared to stock cast pistons. The 84.5mm bore size offers a slight overbore configuration, optimized for the 8.8:1 compression ratio that makes this set ideal for forced induction applications including turbocharging and supercharging.

Each piston features Wiseco's proprietary ArmorGlide skirt coating, a solid film lubricant that dramatically reduces friction during operation, minimizes piston-to-cylinder wall wear, and provides seizure resistance even under extreme conditions. This coating also contributes to quieter engine operation while freeing up additional horsepower. The precision-engineered ring package includes high-quality compression rings and oil control rings designed to maintain optimal cylinder sealing, reduce blow-by, and ensure consistent compression across all six cylinders. The included chromium alloy steel wrist pins and Spirolox retaining clips ensure secure, reliable installation and operation under high-RPM conditions.

This complete piston set is specifically engineered for the M52TUB25 "Technical Update" engine found in 1998-2000 BMW models including the E46 323i/323Ci, E36/7 Z3, and E39 523i. These engines feature double VANOS variable valve timing and aluminum blocks with cast iron cylinder liners. The pistons are machined to exact tolerances with a 32.7mm compression height and 140mm rod length specification, ensuring proper fitment and engine balance. Whether you're building a dedicated race engine, planning a forced induction setup, or performing a high-performance rebuild, the Wiseco KE118M845 piston set delivers the durability, precision, and power potential demanded by serious BMW enthusiasts and professional engine builders.