Mahle MS Piston Set BMW S55 84mm Bore 89.6mm Stroke 144.35mm Rod 22mm Pin -10.5cc 10.2CR Set of 6

BMW S55 3.0L F80 M3 M4, Bore 84.00mm, Stroke 89.6mm, Rod Length 144.35mm, Dome -21.5cc, 325 Grams Advertised Weight, Set of 6 Pistons and Rings Included.

Mahle pistons were designed as a completely finished drop in forged piston assembly. Other than filling the included performance piston ring set, everything is done for you. Mahle has over 80 plus years of piston manufacturing making pistons from OEM to formula 1 racing. Mahle uses only the best technology to make these pistons. Mahle pistons come standard with anti-friction skirt coating for reduced drag. Forged from M142 low expansion aluminum alloy for high strength and reduced piston to wall clearance. Forced Pin Oiler is used for increased wrist pin lubrication. Pin bores are CNC precision-machined. 20mm High-Quality Steel Wrist Pin (98g), Performance 1.0, 1.2, 2.8mm performance ring set, steel nitrided top ring, and Race Proven Round Wire Locks are included.

Compression Ratio Stock 10.3:1.