... main technical parameters of CY4102BQ Model CY4102BQ Type Vertical, in-line, water-cooled, four strokes, natural aspirated No. of cylinder-bore ... ×118 Displacement 3.856 Type of combustion chamber Direct injection, square combustion chamber Compression ratio 17.5:1 Rated power/speed ... truck, 6-7 m passenger bus ect. CY4102 Vertical, in-line, water-cooled, four strokes, natural aspirated