Wiseco K541M815AP Forged 81.50 mm B-Series Piston Set -12 cc Dish

Vehicle Fitment

• Honda / Acura B-Series 1.8 L (B18A1, B18B1)
• Common applications: Acura Integra, Honda Civic with B18A/B1 engines

Features

• Forged from high-strength 2618 aluminum alloy for superior durability
• ArmorGlide® skirt coating reduces friction and improves longevity
• -12 cc dished crown lowers compression for turbo or high-stress builds
• Precision ring grooves and anti-detonation design for reliable ring sealing
• Strutted skirt design enhances rigidity under high RPM
• Forced pin oiling ensures proper wrist pin lubrication
• Floating 21 mm wrist pins for secure piston assembly
• High-performance ring set included (top, second, oil)

Specifications

• Bore: 81.50 mm
• Compression Height: 30.00 mm
• Piston Volume: -12 cc (dish)
• Wrist Pin Diameter: 21 mm (0.827 in)
• Material: Forged 2618 aluminum
• Weight per Piston: ~301 g
• Ring Set: High-performance included
• Compression Ratio: ~8.3:1

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 K541M815AP is a forged piston kit designed for Honda/Acura B-Series 1.8 L engines, including B18A1 and B18B1 variants. Featuring an 81.50 mm bore and -12 cc dished crown, these pistons are ideal for low-compression applications, including turbocharged and high-boost setups.

Constructed from durable 2618 aluminum with ArmorGlide® coated skirts, the pistons provide exceptional strength and reduced friction. The strutted skirt design increases rigidity during high-RPM operation, and the forced pin oiling ensures proper wrist pin lubrication under high-stress conditions.

This complete kit includes floating 21 mm wrist pins, retainers, and a premium high-performance ring set. It delivers reliable, high-performance operation for street or track B-Series builds, offering both durability and power potential for serious engine builders.