Wiseco K566M81AP Professional Series Piston Kit 81mm Bore Honda B16A B18 LS VTEC

The Wiseco K566M81AP Professional Series Piston Kit is engineered for serious racers and high-performance builders working with Honda B16A and B18 LS VTEC engines. This complete 4-piston kit features an 81.0mm bore diameter with a 5.0cc dome design, delivering an impressive 11.49:1 compression ratio for maximum power output.

Technical Specifications:

• Bore Diameter: 81.0mm (3.189 inches)
• Compression Height: 30.10mm (1.185 inches)
• Piston Pin Diameter: 21mm (0.827 inches)
• Dome Volume: 5.0cc
• Compression Ratio: 11.49:1

Key Features:

• Forged from 2618 aluminum alloy for superior tensile strength and durability
• ArmorGlide skirt coating for seizure resistance, friction reduction, and quieter operation
• ArmorPlate coating on ring grooves and wrist pin bores for increased durability and corrosion resistance
• Precision-machined ring grooves for maximum ring seal and minimized blow-by
• Complex crown shapes designed to optimize intake charge efficiency and combustion
• Generous valve pocket designs for maximum flow (piston-to-valve clearance must be checked)
• Engineered and manufactured in the USA

Complete Kit Includes:

• Four forged pistons
• Premium piston rings
• Chromium alloy steel wrist pins
• Circlips

Wiseco's Professional Series pistons are designed for heavy to severe duty race builds where no compromises can be made. The featured-aligned grain flow technology and advanced forging processes ensure these pistons can withstand extreme RPMs and demanding racing conditions. Ideal for Honda Civic Si, Acura Integra, and B-series LS VTEC engine builds.