... iron with surface nitriding treatment.·Piston top is of hot flow type, the skirt section has oval barrel curved surface,the ... thermostat.The main technical parameters of CY4102BQ Model CY4102BQ Type Vertical, in-line, water-cooled, four strokes, natural aspirated No. of ... tons cargo truck, 6-7 m passenger bus ect. CY4102 Vertical, in-line, water-cooled, four strokes, natural aspirated