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Mahle single replacement piston for Honda/Acura K20 applications: 86.00 mm bore with an 86 mm stroke, paired with a 139 mm connecting rod and a 22 mm wrist pin. Described as a single piston in Mahle’s MS series, specifications reference an approximately 12 cc combustion volume and a roughly 12.x compression ratio. The extended data lists 4032 alloy construction and single-piston build, indicating OE-style materials and fitment intent.
Mahle MS Honda/Acura K20 86mm Bore 86mm Stroke 139mm Rod 22mm Pin 12cc 12.7 CR - Single Piston
