Wiseco K542M81 Forged 81 mm B-Series Piston Set +5 cc Dome

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 superior durability
• ArmorGlide® coated skirts reduce friction and extend piston life
• +5 cc dome crown increases compression for better performance
• Anti-detonation groove and precision ring lands for reliable sealing
• Strutted skirt design provides strength and stability under high RPM
• Forced pin oiling ensures consistent wrist pin lubrication
• Floating 21 mm wrist pins included for secure piston assembly
• High-performance ring set included (top, second, oil)

Specifications

• Bore: 81.00 mm
• Compression Height: 30.00 mm
• Piston Volume: +5 cc (dome)
• Wrist Pin Diameter: 21 mm
• Material: Forged 2618 aluminum
• Weight per Piston: ~301 g
• Ring Set: High-performance included
• Compression Ratio: ~10.2:1

Included Components

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

Product Description

The Wiseco K542M81 is a high-performance forged piston kit designed for Honda/Acura B-Series 1.8 L engines, including B18C and B18B variants. Featuring an 81 mm bore and a +5 cc dome, these pistons are ideal for naturally aspirated or mildly boosted builds that require increased compression and enhanced power output.

Constructed from premium 2618 aluminum alloy with ArmorGlide® coated skirts, these pistons combine strength with low-friction performance. The strutted skirt design provides rigidity for high-RPM operation, while forced pin oiling ensures reliable lubrication to the wrist pins for long-lasting performance.

This complete kit includes floating 21 mm wrist pins, retainers, and a high-quality high-performance ring set. Perfect for street or track builds, the K542M81 delivers a reliable and powerful foundation for B-Series engines aiming for maximum performance.