Wiseco K541M815 Forged 81.50 mm B-Series Piston Set -12 cc Dish

Vehicle Fitment

• Honda / Acura B-Series 1.8 L (B18) engines
• Common in: Acura Integra, Honda Civic (B18C/B18B)

Features

• Forged from high-strength 2618 aluminum alloy for maximum durability
• ArmorGlide® skirt coating to minimize friction and wear
• -12 cc dished crown lowers compression for turbo or high-stress builds
• Anti-detonation groove and precision ring lands enhance ring sealing
• Forced pin oiling ensures consistent lubrication to the wrist pin
• Floating 0.8268" (21 mm) wrist pins for secure and reliable assembly
• Strutted skirt design adds structural strength under high RPM
• Includes a full, high-performance ring set (1.0 / 1.2 / 3.0 mm)
• Suitable for racing, turbocharged, or severe-duty street builds

Specifications

• Bore: 81.50 mm
• Compression Height: 30.00 mm
• Piston Dish Volume: -12 cc
• Wrist Pin Diameter: 21 mm (0.8268 in)
• Material: Forged 2618 aluminum
• Weight (per piston): ~301 g

Included Components

• 4x Forged Wiseco pistons
• 4x Floating wrist pins (21 mm)
• 4x Retainers for wrist pins
• 4x High-performance piston rings (1.0 / 1.2 / 3.0 mm)

Product Description

The Wiseco K541M815 is a professional-series forged piston kit built specifically for Honda/Acura B-Series 1.8L (B18) engines. Featuring an 81.50 mm bore and a -12 cc dish design, it is engineered for high-performance applications, especially turbocharged or high-stress builds where reduced compression can help manage detonation.

Manufactured from durable 2618 aluminum, these pistons incorporate ArmorGlide® coated skirts to lower friction and extend service life. The anti-detonation groove and precision ring lands contribute to excellent ring seal under aggressive tuning, while the forced pin oiling keeps the wrist pin well-lubricated in demanding conditions.

This kit includes floating 21 mm wrist pins, retainers, and a full high-performance ring set, making it ideal for engine builders focused on strength, reliability, and high rpm capability. It is perfectly suited for builds targeting turbo setups, high boost, or sustained performance driving in B-Series platforms.