The hybrid (16) comprises a two cycle engine (18), boosted by the engine power compressor (22) and a hydraulic pump (24). The pump plunger (114) fastened to engine piston (38) and located coaxially with the compressor piston (62) and pump (24) rotor (106), provide direct energy transmission to the compressor and pump. The plunger (114) and compressor piston (62), each connected to one of two diametrically opposite axial push rods (138), (142) of the rotor (106).