Automobile engine

The invention provides an automobile engine, belongs to the technical field of mechanical engineering and aims to solve the technical problem of how to provide an automobile engine allowing lower fuel consumption for an automobile. The automobile engine comprise a cylinder block and a cooling water pump; the cylinder block is provided with a volute chamber, an inflow passage communicated with the volute chamber and a reflow passage; the cooling water pump comprises a pump shell, a spindle and an impeller having a water passage; the impeller is provided within the volute chamber; the pump shell is fixedly connected with the cylinder block; the spindle penetrates the pump shell; one end of the spindle is fixedly connected with the impeller; the impeller is sleeved with a retaining sleeve; the impeller is provided with a temperature control component comprising thermosensitive wax, a piston rod and a return spring; the piston rod is fixedly connected with the retaining sleeve. High-speed warming of the automobile engine is achieved by controlling the flow of the cooling water pump, and automobile fuel consumption is effectively decreased.