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Sourcing here online suppleirs selling Machinery Engines & Parts. Get info of function, configuration, parameters and price of Machinery Engines & Parts. Alibaba.com has a wide selection at great prices to help you get qualified suppliers of Machinery Engines & PartsAn engine is a device that converts potential energy into mechanical work. It is a machine designed to convert energy into useful mechanical motion. It is a machine with moving parts, which converts the power into motion. ... Engines are machines which operate in motion to convert one form of energy into other.