Abstract: Device for the injection in internal combustion engines of combustible emulsions with a readily variable ratio, constituted by a hydrocarbon phase and a component poorly miscible with it, which comprises a positive-displacement pump driven by a portion of the delivery of the injection pump fed with the hydrocarbon phase, said positive-displacement pump carrying out the pumping of the other component of the emulsion; the two components of the emulsion are combined in the injector, which incorporates a static emulsifying device upstream the same injector.

Abstract: The plant described resolves the problem of recovering the energy generated by heat engines under test, acceptance trials or experimental tests by the generation of alternating electrical current for which the alternator is always connected to the supply network even in the absence of mechanical energy produced by said engines under test, there being provided hydraulic pumping dynamometric units which act upon said generator through an accumulation and regulation unit which provides for smoothing out the liquid delivery rate by the action of a differential piston group adapted for exposing and closing discharge or supply apertures for the hydraulic circuit in response to the variations of power which take place during the test or acceptance cycles of said heat engines and which manifest themselves in variations in output rate of said dynamometric pumping units.