Wiseco K594M84AP Forged 84.00 mm Pistons for Honda B-Series (B16 / B18 / B20)

Vehicle Fitment

• Honda B16A (1.6 L DOHC 16V)
• Honda B18A1 / B18B1 (with B16A VTEC head)
• Honda B18C (high-compression VTEC, e.g., GSR)
• Honda B20B / B20Z (with VTEC-head conversion)

Features

• Forged from 2618 aerospace-grade aluminum for high strength and performance
• ArmorPlating or ArmorGlide® skirt coating to reduce friction and improve durability
• Strutted forging design for enhanced structural rigidity under high load
• Dome design (8.3 cc) optimized for high-compression engine builds
• Anti-detonation groove to help minimize engine knock
• Forced-pin oiling ensures excellent lubrication to the wrist pins
• Includes a pre-gapped high-performance ring set (8400XX)
• Multiple compression ratio variants available depending on build (11.5:1, 12.9:1, 13.1:1)

Specifications

• Bore Diameter: 84.00 mm
• Compression Height: 30.00 mm
• Dome Volume: ~8.30 cc
• Compression Ratio Options: ~11.5:1, ~12.9:1, ~13.1:1 (depending on variant)
• Wrist Pin Diameter: 21.00 mm
• Piston Material: Forged 2618 aluminum alloy
• Nominal Piston Weight: ~275 g
• Ring Set Included: 8400XX

Included Components

• 4x Forged Pistons
• 4x Wrist Pins (21 mm)
• 1x Pre-gapped Ring Set (8400XX)
• 4x Piston Locks / Circlips

Product Description

The Wiseco K594M84AP is a professional-grade forged piston kit designed for high-performance Honda B-series engines. Built from 2618 aluminum, these pistons are made to withstand racing or aggressive street builds with high RPM and compression demands.

They feature an 84.00 mm bore, a 30.00 mm compression height, and a dome volume of approximately 8.3 cc. Depending on your engine configuration (head type, deck height, gasket), you can choose from multiple compression ratios - from ~11.5:1 for more moderate builds, up to ~13.1:1 for very high compression setups.

With ArmorPlating/Glide skirts, strutted forgings, and forced-pin oiling, these pistons maximize durability under load. The included 8400XX ring set is pre-gapped for a reliable seal, making installation more straightforward. Ideal for B16A, B18 (with VTEC or high compression), or B20 swaps, this kit provides a strong, precise foundation for both street and race engines.