Wiseco K673M81AP Forged Pistons for 1993-2001 Honda / Acura B-Series

Vehicle Fitment

• 1993-2001 Honda Civic SI (B16A)
• 1992-1993 Acura Integra GSR (B17A1)
• 1994-2001 Acura Integra (B18C, B18A)

Features

• Forged from aerospace-grade 2618 aluminum for high strength
• ArmorGlide® coated skirts for reduced friction and improved durability
• Professional-series design built for severe-duty performance builds
• Dished crown (-8 cc) to lower compression and improve knock resistance
• Fully machined ring grooves and anti-detonation groove for strong ring sealing
• Forced-pin oiling ensures reliable lubrication at high RPM
• Designed for 21 mm floating wrist pins
• Includes performance piston ring set (8100XX series)

Specifications

• Bore: 81.00 mm
• Compression Height: 30.00 mm
• Piston Dish Volume: -8.00 cc
• Compression Ratio: ~8.2:1
• Wrist Pin Diameter: 21 mm
• Number of Pistons: 4 (for 4-cylinder B-series)
• Material: Forged 2618 Aluminum

Included Components

• 4x forged pistons (81.00 mm)
• 4x 21 mm floating wrist pins
• 8x circlips / pin locks
• 1x ring set (8100XX series)
• Specification / data sheet

Product Description

The Wiseco **K673M81AP** piston kit is engineered for high-performance B-series Honda and Acura engines, including the B16A (Civic Si), B17A1 (Integra GSR), and B18C / B18A (Integra). These forged pistons are built from 2618 aluminum, making them strong and suitable for track or race builds.

With an 81.00 mm bore and a -8 cc dish profile, this set achieves a compression ratio of approximately 8.2:1, offering a good balance of performance and detonation resistance. The ArmorGlide® coated skirts reduce friction, and the forced-pin oiling helps maintain reliable lubrication under high RPM.

This complete piston kit includes four pistons, wrist pins, clips, and a high-quality ring set - everything needed for a full bottom-end rebuild or upgrade. Ideal for engine builders looking for durable, race-ready components for B-series builds.