Wiseco K556M8625 Forged Piston Kit Bore Nissan - 86.25mm SR20DE SR20DET

The Wiseco K556M8625 is a high-performance forged piston kit designed specifically for Nissan SR20DE and SR20DET engines. This complete 4-piston set features an oversized 86.25mm (3.396 inch) bore, providing a +0.25mm overbore for rebuilt or modified engines. Engineered for both naturally aspirated and turbocharged applications, these pistons deliver the strength and reliability demanded by performance builders.

Key Specifications:

• Bore: 86.25mm (3.396 inches)
• Compression Height: 32mm (1.260 inches)
• Piston Style: Dish with four valve reliefs
• Piston Head Volume: -12cc dish
• Compression Ratio: 9.0:1 to 9.25:1
• Wrist Pin Diameter: 22mm (0.866 inches)
• Piston Weight: 330 grams
• Stroke: 86mm
• Rod Length: 136.25mm

Premium Features:

• Forged aluminum construction for superior strength and durability
• Dedicated in-house forgings optimized for light weight and optimal design
• Specially designed valve pockets for multivalve applications
• Complete kit includes pistons, high-quality piston rings, wrist pins, and locks
• Top ring: 1.0mm steel with gas nitrided facing
• Second ring: 1.2mm cast iron with phosphate coating
• Oil ring: 2.8mm stainless steel
• File-fit rings for precise end gap adjustment

Wiseco pistons are forged and machined in the USA using 2618 aluminum alloy, ensuring consistent quality and performance. The four-valve relief design accommodates high-lift camshafts and oversized valves, making this kit ideal for turbocharged builds ranging from street performance to serious racing applications. Each piston undergoes extensive heat treatment and finishing processes to deliver tight tolerances and long-term reliability.

Application: Nissan 180SX, 200SX, 240SX (S13, S14, S15) with SR20DE or SR20DET 2.0L 16V engines.