Wiseco K593M815 Forged 81.50 mm Pistons for 1990-2001 Honda B-Series B16/B17/B18

Vehicle Fitment

• 1990-2001 Acura Integra (B16A, B17A1, B18A1/B1, B18C)
• 1994-2001 Honda Civic Si / Del Sol (B16A, B18 variants)

Features

• Forged from high-strength 2618 aluminum alloy
• ArmorGlide® skirt coating reduces friction and prevents seizure
• Strutted forging design for enhanced structural integrity
• Fully machined crown with valve reliefs for high-lift cams
• Anti-detonation groove to reduce engine knock
• Forced-pin oiling for reliable wrist pin lubrication
• Pre-gapped plasma-moly piston ring set included
• Lightweight design (~278 g) for high-RPM performance

Specifications

• Bore Diameter: 81.50 mm
• Compression Height: 30.00 mm
• Dome Volume: ~8.30 cc
• Compression Ratio: ~11.0:1-12.5:1 depending on variant
• Wrist Pin Diameter: 21 mm
• Piston Material: Forged 2618 aluminum
• Nominal Piston Weight: ~278 g

Included Components

• 4x Forged Pistons
• 4x Wrist Pins (21 mm)
• 1x Pre-gapped plasma-moly ring set (1/16, 1/16, 3/16)
• Piston locks / circlips

Product Description

The Wiseco K593M815 is a high-performance forged piston kit for Honda and Acura B-series engines, including B16, B17, and B18. Crafted from 2618 aluminum alloy, these pistons provide strength and durability for high-RPM and racing applications.

Featuring an 81.50 mm bore and 30.00 mm compression height, the pistons offer a dome volume of ~8.3 cc, producing compression ratios between ~11.0:1 and ~12.5:1 depending on the engine variant. ArmorGlide® skirt coating minimizes friction and prevents scuffing, while strutted forging ensures excellent structural integrity.

Forced-pin oiling delivers reliable lubrication, and the kit includes pre-gapped plasma-moly rings for optimal sealing. This set is ideal for performance builds on Integra, Civic, or Del Sol B-series engines, providing a durable, lightweight, and precise upgrade over stock components.