Wiseco K541M81AP Forged 81 mm B-Series Piston Set -12 cc Dish

Vehicle Fitment

• Honda / Acura B-Series 1.8 L (B18A/B1)
• Common applications: Acura Integra, Honda Civic with B18 engines

Features

• Forged from high-strength 2618 aluminum alloy for maximum durability
• ArmorGlide® coated skirts to reduce friction and improve longevity
• -12 cc dished crown for reduced compression in forced-induction or high-stress builds
• Precision ring grooves with anti-detonation design for reliable sealing
• Strutted skirt design enhances stability at high RPM
• Forced pin oiling ensures optimal lubrication to wrist pins
• Floating 21 mm wrist pins included for secure assembly
• High-performance ring set included (top, second, oil)

Specifications

• Bore: 81.00 mm
• Compression Height: 30.00 mm
• Piston Volume: -12 cc (dish)
• Wrist Pin Diameter: 21 mm
• Material: Forged 2618 aluminum
• Weight per Piston: ~300 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 K541M81AP is a forged piston kit built for Honda/Acura B-Series 1.8 L engines, including B18A and B18B1 variants. With an 81 mm bore and -12 cc dished crown, these pistons are ideal for forced-induction or high-stress applications where a lower compression ratio is desired.

Crafted from durable 2618 aluminum and featuring ArmorGlide® coated skirts, the pistons offer superior strength and reduced friction. The strutted skirt design provides extra rigidity under high RPM, while forced pin oiling ensures consistent lubrication to the wrist pin for long-term reliability.

This complete kit includes floating 21 mm wrist pins, retainers, and a premium high-performance ring set. Designed for high-performance street or track B-Series builds, the K541M81AP delivers strength, reliability, and optimized power potential for serious engine projects.