Wiseco K542M81AP Forged Sport Piston Kit for 1993-2001 Honda Civic / B16A

Vehicle Fitment

• 1993-2001 Honda Civic (B16A, 1.6L DOHC)
• 1990-1993 Acura Integra (B17A1 / B17A, 1.7L)
• 1990-2001 Honda B-Series: B18A / B18B / B18C (1.8L VTEC / non-VTEC)

Features

• 2618 aerospace-grade forged aluminum for high strength and reduced weight
• ArmorGlide® skirt coating for reduced friction and smoother piston operation
• Strutted forging design enhances strength and rigidity under high RPM
• Valve pocket design optimized for high-lift cams and oversized valves
• Flat-top crown with quench volume for efficient combustion and reduced detonation
• Precision machined ring grooves for superior sealing and reduced blow-by
• Offset wrist pin helps reduce piston slap and noise
• Complete kit includes wrist pins and piston rings for a full rebuild

Specifications

• Bore: 81.00 mm (standard)
• Stroke varies by engine: B16A: 77.4 mm; B17A: 81.4 mm; B18A/B: 89.0 mm
• Rod length: 134.3 mm (5.287")
• Compression height: 29.85 mm (1.175")
• Block height: 203 mm
• Piston weight: ~280 g
• Wrist pin diameter: 21 mm
• Compression ratio: ~8.79:1 (B16A), 9.4:1 (B18A/B)
• Front/Rear: Pistons installed per cylinder bank configuration

Included Components

• 4x forged pistons (K542M81AP)
• 4x wrist pins (21 mm)
• 4x piston ring sets
• 4x wrist pin locks

Product Description

The Wiseco K542M81AP is a high-performance forged piston kit engineered for Honda and Acura B-series engines. Made from 2618 aerospace-grade aluminum, these pistons provide excellent strength and reduced weight for high-revving engines while maintaining durability under extreme conditions. ArmorGlide® coating on the skirts minimizes friction for smoother operation and enhanced efficiency.

The flat-top crown design with quench volume ensures stable combustion and reduces detonation risk. Offset wrist pins help minimize piston slap and noise, and precision machined ring grooves provide superior sealing. The valve pockets are designed to accommodate high-lift cams and oversized valves, making this kit ideal for sport and performance applications.

This complete kit includes four forged pistons, wrist pins, locks, and piston rings, providing everything needed for a full rebuild. It is compatible with Honda Civic B16A, Acura Integra B17A, and B18A/B/C-series engines, making it a versatile solution for performance enthusiasts upgrading or rebuilding their engine.