Wiseco KE103M915AP Ford Cosworth YB 2.0L 16V Forged Piston Set 91.50mm Bore 8.0:1 CR

The Wiseco KE103M915AP is a Professional Series forged piston set engineered for the Ford Cosworth YB and N5 2.0L 16V engine found in the Sierra and Escort Cosworth platforms. Featuring a 91.50 mm bore, 8.0:1 compression ratio, and a -20.2cc dish crown design, this kit is purpose-built for turbocharged, boost-ready builds where reliability and power handling are critical.

Key Specifications:

• Bore: 91.50 mm
• Compression Ratio: 8.0:1 (with 1.00 mm head gasket)
• Dish Volume: -20.2cc
• Compression Height: 40.80 mm
• Wrist Pin Diameter: 24 mm (0.945 in.)
• Engine Codes: YB / N5

Key Features:

• Forged and machined in the USA from 2618 aluminum alloy for superior tensile strength and heat resistance
• ArmorGlide® skirt coating reduces friction, resists seizure, and enables tighter bore fitment for improved ring seal
• Armor Plated (AP) crown, ring grooves, and pin bore — raises aluminum hardness, prevents ring micro-welding, reduces carbon buildup, and combats detonation damage
• Dish crown profile optimized for turbocharged applications at 8.0:1 static compression
• Full round skirt design for stable cylinder contact and quiet operation
• Offset wrist pin design mirrors OEM geometry for reduced piston slap

Kit includes pistons, wrist pins, wire locks, and premium piston rings. Wiseco Professional Series pistons are a no-compromise solution for serious engine builders tackling high-boost or motorsport race builds.