Wiseco K650M88AP High-Compression Forged Pistons for 2002-11 Honda/Acura K20 2.0

Vehicle Fitment

• 2002-2006 Acura RSX / RSX Type-S (K20A / K20Z)
• 2006-2011 Honda Civic Si (K20Z)
• Other Honda / Acura K-series 2.0 L engines compatible with 88 mm bore

Features

• Forged from 2618 aluminum alloy for high strength and fatigue resistance
• ArmorGlide® coated skirts to reduce friction and minimize noise
• +10.5 cc dome design for high compression (~12.8:1)
• Strutted forging structure enhances rigidity under high-load conditions
• Forced-pin oiling for optimal lubrication of wrist pin area
• Precision-machined ring grooves with anti-detonation groove
• High-performance nitrided ring set included
• Armor-plated (AP) option strengthens ring lands for durability

Specifications

• Bore: 88.00 mm
• Stroke: ~86.00 mm (typical K20 stroke)
• Compression Height: 30.00 mm
• Dome Volume: +10.5 cc
• Compression Ratio: ~12.8:1
• Wrist Pin Diameter: 22 mm
• Piston Weight: ~340 g
• Ring Set: 8800XX steel / nitrided included

Included Components

• 4x Forged pistons
• 4x Wrist pins (22 mm)
• 4x Retaining clips
• 1x Ring set (8800XX)

Product Description

The Wiseco K650M88AP is a professional-grade, high-compression forged piston kit engineered for Honda K-series 2.0 L (K20) engines. Made from 2618 aluminum alloy and featuring ArmorGlide® skirt coating, these pistons offer superior strength, reduced friction, and increased durability under extreme operating conditions. The +10.5 cc dome produces a compression ratio of ~12.8:1, perfect for naturally aspirated or performance-tuned builds.

Strutted forging provides structural rigidity at high RPM, while forced-pin oiling ensures reliable lubrication to the wrist pins. Armor-plated (AP) ring lands enhance durability for high-power applications, and precision ring grooves help reduce blow-by and maintain sealing. This kit is ideal for builders seeking high-revving, race-ready performance from K20 engines.

Installation requires verifying piston-to-wall clearances and deck height. The kit comes complete with 4 forged pistons, wrist pins, retaining clips, and a high-quality steel ring set, providing everything needed for a dependable, high-performance K-series engine build.