a vacuum pump includes an inlet port and an exhaust port . gas from an enclosure connected to the inlet port is pumped to the exhaust port by first and second rotors which are mounted on first and second shafts extending through a pump chamber . the rotors are connected with shaft sections which include a lobe extending from the shaft sections and a mating channel defined in the other . the lobes matingly engage the channels during rotation of the rotors to form a suction section . the suction section compresses a volume of gas entering the pump from the inlet port reducing the power consumed to move the volume of gas through the pump chamber more easily and increase pump efficiency .