An engine whose purpose's to produce kinetic energy output from a fuel source's called a ; alternatively, a motor's a device which produces kinetic energy from other forms of energy (such as electricity, a flow of hydraulic fluid or compressed air). A motor car (automobile) has a starter motor and motors to drive pumps (fuel, power steering, etc) – but the power plant that propels the car's called an engine. The term 'motor' was originally used to distinguish the new internal combustion… (More on Engines)