Wiseco K566M815AP Forged 81.5 mm +5 cc Pistons for Honda B-Series

Vehicle Fitment

• Honda B16A (Civic Si, 1993-2001)
• Honda / Acura B18C (Integra GS-R, 1994-2001)
• Honda / Acura B18A1 / B18B1 (with VTEC head)

Features

• Forged from 2618 aluminum for high strength and fatigue resistance
• Armor-plated piston skirts for reduced friction and wear
• +5 cc positive dome design to boost compression
• CNC-machined crown with valve reliefs for B-series head clearance
• Strutted forging for added rigidity in high-stress areas
• ArmorGlide® coating for seizure resistance and quiet operation
• High-performance piston ring set included
• Floating 21 mm wrist pin design

Specifications

• Bore: 81.50 mm
• Compression Height: 30.10 mm
• Piston Volume / Dome: +5.0 cc
• Wrist Pin Diameter: 21 mm
• Piston Material: Forged 2618 alloy
• Piston Weight: ~281 g each
• Piston Type: Positive-dome
• Ring Lands: Top ~1.0 mm, Second ~1.2 mm, Oil ~3.0 mm

Included Components

• 4x forged pistons (+5 cc dome)
• 4x 21 mm wrist pins
• 4x circlips / locks
• 4x high-performance piston ring sets

Product Description

The Wiseco K566M815AP piston kit is a high-performance forged set designed for Honda B-series engines, including B16A and B18C. The +5 cc dome increases compression, ideal for high-RPM naturally aspirated builds. Constructed from 2618 aluminum, these pistons offer exceptional strength and durability under demanding conditions.

Armor-plated skirts and ArmorGlide® coating reduce friction and improve longevity, while the strutted forging design provides structural stiffness under load. The 21 mm floating wrist pins and matched ring set deliver high-performance sealing and reliability.

Installation requires checking bore size, ring gap, and deck clearance. For B16A engines, a minimum 0.040" head gasket may be recommended to manage compression. This kit is ideal for race and performance applications requiring precision and durability.