Wiseco K566M815 Forged 81.5 mm Pistons for Honda B18 / B16

Vehicle Fitment

• Honda B18 (Integra / Civic, 1.8 L)
• Honda B16A / B16-series (1.6 L) - compatible with certain setups

Features

• Forged from 2618 aerospace-grade aluminum for high strength and fatigue resistance
• ArmorGlide® skirt coating - reduces friction and enhances durability
• CNC-machined crowns with precision ring grooves and anti-detonation groove
• Forced-pin oiling to maintain lubrication under high-RPM conditions
• Strutted forging design for structural rigidity in high-stress areas
• Designed for heavy to severe-duty race usage
• Includes premium piston rings for optimal sealing
• Dome volume design - improves compression characteristics for performance builds

Specifications

• Bore: 81.50 mm
• Compression Height: 30.00 mm
• Crown / Dome Volume: +5.00 cc (dome)
• Wrist Pin Diameter: ~0.8268 in (≈ 21 mm)
• Piston Material: Forged 2618 alloy
• Piston Type: Positive-dome
• Ring Lands: Top ~1.0 mm, Second ~1.2 mm, Oil ~3.0 mm
• Piston Quantity: 4

Included Components

• 4x forged pistons
• 4x wrist pins
• 4x piston ring sets
• 4x circlips / locks for wrist pins

Product Description

The Wiseco K566M815 is a high-performance forged piston kit tailored for Honda B-series engines, such as the B18 and B16. Built from 2618 aluminum, these pistons are designed to withstand high RPM and demanding race conditions while delivering reliable durability.

Featuring a +5 cc dome design, these pistons raise compression, making them ideal for naturally aspirated performance builds. The ArmorGlide coating on the skirts reduces friction and improves wear resistance, and the forced-pin oiling ensures reliable lubrication even in aggressive driving.

This kit comes complete with rings and hardware, giving you everything needed for a full piston refresh or high-stress build. Proper installation requires checking ring gaps, piston-to-wall clearance, and verifying deck height to optimize compression and longevity.