Wiseco K673M815AP Forged Dish Pistons for 1990-2001 Honda B-Series

Vehicle Fitment

• Honda B16A (e.g., Civic Si) - 81.50 mm setup
• Honda B18A / B / C (e.g., Integra, LS-VTEC) - 81.50 mm bore + B16A head style

Features

• Forged from 2618 aerospace-grade aluminum for high strength and durability
• ArmorGlide® or ArmorPlating® coated skirts to reduce friction and improve lifespan
• Dished crown (~-8 cc) for moderate compression (varies by variant: ~8.2:1 or ~9.1:1)
• Strutted-forged design to reinforce stress zones under high load
• Fully machined ring lands with anti-detonation groove for robust ring seal
• Floating 21 mm wrist pins included for high-RPM stability
• Complete piston ring set (8150XX series) included

Specifications

• Bore: 81.50 mm
• Compression Height: ~30.00 mm
• Piston Dish Volume: -8.00 cc
• Compression Ratio: approx **9.1:1** (for some variants) :contentReference[oaicite:0]{index=0}
• Wrist Pin Diameter: 21 mm
• Piston Count: 4 (for 4-cylinder B-series)
• Material: Forged 2618 Aluminum

Included Components

• 4x forged dish pistons
• 4x 21 mm floating wrist pins
• 8x circlips / pin locks
• 1x Wiseco 8150-series piston ring set
• Specification / data sheet

Product Description

The Wiseco **K673M815AP** piston kit is a high-performance upgrade for Honda B-series engines, especially for B16 and B18 applications using an 81.50 mm bore. These forged pistons are made from premium 2618 aluminum for strength and low fatigue, ideal for tuned or racing engines.

With a -8 cc dished crown, these pistons deliver a moderate compression ratio that balances power and reliability. The ArmorGlide® or ArmorPlating® skirt coating helps minimize friction and protect against scuffing, while the strutted forging provides structural rigidity under high stress.

The full kit includes four pistons, wrist pins, circlips, and a performance ring set - everything you need for a complete rotating assembly upgrade. This makes it an excellent choice for builders looking to boost, rev high, or push the limits of their B-series build.