Overview The Cat® C9.3B Industrial Diesel Engine is offered in ratings ranging from 230-310 bkW (308-416 bhp) @ 1800-2200 rpm. These ratings meet China Nonroad Stage III, Brazil MAR-1, and UN R96 Stage IIIA emission standards. The C9.3B engines are ideal choices to power applications in agriculture, aircraft ground support, construction, forestry, general industrial, material handling, and mining.