Wiseco K593M81AP Forged Dome Piston Kit (81 mm) for Honda B-Series

Fitment

• Honda B-Series engines: B16A, B17A1, B18A1/B1, B18C (16V)

Features

• Forged 2618 aluminum construction for high strength
• ArmorGlide® skirt coating reduces friction and improves durability
• Strutted forging design for extreme performance applications
• Precision-machined piston crown, ring grooves, and anti-detonation groove
• Optimized dome shape for efficient quench and combustion
• Includes piston rings, wrist pins, and locks for complete rebuilds
• Supports multiple compression ratios depending on engine build
• Designed for high-RPM and severe-duty applications

Specifications

• Bore: 81.00 mm
• Compression Height: 30.00 mm
• Dome Volume: ~8.3 cc
• Pin Diameter: 0.827 in (~21 mm)
• Material: Forged 2618 aluminum
• Coating: ArmorGlide® skirt coating
• Compression Ratios: 11.1:1 (B16A) to ~12.2-13.4:1 (B18 variants)
• Ring Set: Included
• Weight: ~270-280 g per piston

Included Components

• 4x forged pistons
• Set of piston rings (top, 2nd, oil ring)
• 4x wrist pins
• 4x circlips / locks
• Installation guide/spec sheet

Product Description

The Wiseco K593M81AP is a high-performance forged dome piston kit engineered for Honda B-Series engines. Built from 2618 aerospace-grade aluminum, these pistons are designed to withstand high RPMs and severe-duty use. The strutted forging and coated skirts reduce friction, resist seizure, and provide long-lasting reliability.

With an 81 mm bore and 30 mm compression height, this kit supports multiple compression ratios to suit various engine builds. The dome design enhances combustion efficiency and promotes effective quench to minimize knock.

Each kit comes complete with piston rings, wrist pins, and locks, offering a comprehensive solution for performance upgrades or engine rebuilds. Ideal for high-revving street engines or race-ready B-series builds, the K593M81AP delivers precision, strength, and durability required by serious builders.