Wiseco K542M815AP Forged 81.50 mm Pistons for Honda B16A / B18

Vehicle Fitment

• Honda B16A - Civic Si / VTi (1993-2001)
• Honda B17A1 - Integra GS-R
• Honda B18A1/B1 - Integra LS / RS
• Honda B18C1 - Integra GS-R
• Honda B18C5 - Integra Type R

Features

• High-strength 2618 forged aluminum construction for maximum durability
• ArmorGlide® coated skirts to reduce friction and prevent cold scuffing
• Strutted forging design for improved stability under high RPM
• Flat-top crown with precision-machined ring lands
• Forced pin oiling for consistent wrist pin lubrication
• Anti-detonation and pressure accumulator grooves for optimized ring seal
• Performance ring set included for high cylinder sealing efficiency

Specifications

• Bore Diameter: 81.50 mm (3.209 in)
• Compression Height: 1.175 in
• Piston Volume: -2.4 cc
• Piston Material: Forged 2618 aluminum
• Wrist Pin Diameter: 21 mm
• Ring Sizes: 1.2 mm / 1.2 mm / 3.0 mm
• Set Quantity: 4 pistons
• Intended Use: Performance rebuilds, NA or mild boost

Included Components

• 4 x Forged pistons (K542M815AP)
• 4 x Wrist pins
• 8 x Circlips / pin locks
• 4 x Piston ring sets

Product Description

The Wiseco K542M815AP piston kit is engineered for builders working on high-performance Honda B-series engines, including B16A and B18 variants. These pistons deliver excellent strength and thermal stability thanks to their 2618 forged aluminum construction, making them ideal for spirited street driving, track use, or moderate boost applications.

The flat-top design with a -2.4 cc volume supports a balanced compression ratio, while the strutted forging adds rigidity for high-RPM reliability. ArmorGlide® skirt coating reduces drag and improves cylinder wall longevity. Each piston includes forced pin oiling and optimized ring grooves for strong and consistent sealing.

This set includes four pistons, rings, wrist pins, and locks - ready for installation following proper piston-to-wall clearance and ring gap setup. Designed with precision and reliability in mind, this kit is a trusted choice for B-series performance builds.