This disclosure relates to a improved thermodynamic cycle with power unit and venturi, a method of producing a useful effect therewith using a greater pressure gradient created locally in a fluid using the venturi, and more particularly, the use of a first portion of the fluid in the thermodynamic cycle as driving force for a venturi, and the placement of the venturi nozzle in an exhaust area of the power unit to create a greater pressure gradient locally and collect a second portion of the fluid in the thermodynamic cycle.