Vehicle Fitment

  • Honda / Acura B‑Series 1.8 L (B18C/B18B)
  • Common applications: Acura Integra, Honda Civic with B18 engines

Features

  • Forged from high-strength 2618 aluminum alloy for maximum durability
  • ArmorGlide® coated skirts reduce friction and extend piston life
  • +12.5 cc dome crown increases compression for higher performance
  • Precision ring grooves and anti-detonation design for reliable sealing
  • Strutted skirt design provides rigidity at high RPM
  • Forced pin oiling ensures proper lubrication of wrist pins
  • Floating 21 mm wrist pins included for secure piston assembly
  • High-performance ring set included (top, second, oil rings)

Specifications

  • Bore: 81.00 mm
  • Compression Height: 30.00 mm
  • Piston Volume: +12.5 cc (dome)
  • Wrist Pin Diameter: 21 mm
  • Material: Forged 2618 aluminum
  • Weight per Piston: ~302 g
  • Ring Set: High-performance included
  • Compression Ratio: ~11.5:1 (depending on head and build)

Included Components

  • 4× Forged Wiseco pistons
  • 4× Floating wrist pins (21 mm)
  • 4× Retainers for wrist pins
  • 4× High-performance ring sets

Product Description

The Wiseco K542M8125AP is a high-performance forged piston kit for Honda/Acura B‑Series 1.8 L engines (B18C/B18B). Featuring an 81 mm bore and +12.5 cc dome crown, these pistons are ideal for turbocharged or naturally aspirated builds that require higher compression and improved power output.

Constructed from durable 2618 aluminum alloy with ArmorGlide® coated skirts, the pistons deliver strength, low friction, and heat resistance. The strutted skirt design enhances rigidity under high RPM, while forced pin oiling ensures reliable wrist pin lubrication in demanding conditions.

This complete kit includes floating 21 mm wrist pins, retainers, and a high-performance ring set. It is engineered for serious street, track, or race B‑Series engine builds, providing the reliability and performance needed for optimized compression and enhanced engine output.



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