Manley Platinum Series Forged Piston Set – Honda B16A1/A2/A3 | 81.5mm (+0.5mm) | 11.0:1 CR | Dish | Set of 4

Build a high-revving, high-compression Honda B16A with the Manley Platinum Series Forged Piston Set — engineered specifically for the Honda B16A1, B16A2, and B16A3 engines as fitted to the 1993–1997 Honda Del Sol and 1999–2000 Honda Civic Si. At 81.5mm bore (+0.5mm over the stock 81mm), these pistons are designed for engines that have been bored 0.5mm oversize. The dish-top design delivers an 11.0:1 compression ratio — a high-compression naturally aspirated specification ideal for maximizing power output on the B16A's high-revving VTEC platform. Manley's Platinum Series pistons are trusted by professional engine builders and tuners worldwide for superior performance and durability.

Key Features

• 2618 Alloy Forging – Stronger Than 4032: Manley's Platinum Series uses 2618 aluminum alloy forgings — a higher-strength alloy than the 4032 alloy used in many competitor pistons. 2618 alloy offers superior impact resistance and fatigue strength for high-RPM, high-stress engine applications. The preferred alloy for forced induction and high-revving naturally aspirated builds
• 81.5mm Bore – +0.5mm Oversize: 81.5mm bore diameter — designed for B16A engines bored 0.5mm over the stock 81mm bore. Requires a 0.5mm overbore machine operation before installation. Verify your engine's bore size before ordering
• 11.0:1 Compression Ratio – Dish Top: Dish-top piston design delivers an 11.0:1 compression ratio — a high-compression naturally aspirated specification for maximum power output on the B16A's high-revving VTEC platform. Verify this compression ratio is appropriate for your fuel type and engine build before ordering
• Proven Cam & Barrel Skirt Profiles: Manley's proven cam and barrel skirt profiles deliver optimal piston-to-wall contact and oil control across the full RPM range — minimizing friction and maximizing ring seal for consistent power output
• Tool Steel Wrist Pins: Tool steel wrist pins deliver superior strength and durability compared to standard wrist pins — critical for high-RPM B16A applications where wrist pin loads are significant
• Moly Skirt Coating: Moly (molybdenum disulfide) skirt coating on select part numbers reduces friction and wear during break-in and throughout the piston's service life
• B16A1/A2/A3 Specific – Del Sol & Civic Si: Engineered specifically for the Honda B16A1, B16A2, and B16A3 engines — as fitted to the 1993–1997 Honda Del Sol and 1999–2000 Honda Civic Si. Verify your specific B16A variant before ordering
• Manley Performance Quality: Manufactured by Manley Performance — a leading US-based piston and engine component manufacturer trusted by professional engine builders and motorsport teams worldwide

Specifications

• Series: Platinum Series
• Type: Forged Piston Set
• Alloy: 2618 Aluminum
• Bore: 81.5mm (+0.5mm Oversize)
• Compression Ratio: 11.0:1
• Top Design: Dish
• Quantity: Set of 4
• Engine: Honda B16A1 / B16A2 / B16A3
• Fitment: 1993–1997 Honda Del Sol / 1999–2000 Honda Civic Si
• Part Number: 603005-4

Note: +0.5mm oversize — requires a 0.5mm overbore machine operation before installation. Verify your engine's bore size before ordering. 11.0:1 compression ratio — verify this CR is appropriate for your fuel type (premium 91+ octane required at minimum) and engine build. High-compression pistons are not suitable for forced induction without appropriate tuning. A complete engine assembly with proper clearances, ring gap, and torque specifications is required — professional engine assembly by an experienced builder is strongly recommended. Rings and bearings not included — verify complete parts list for your build.