Abstract: The present invention relates to a supercharged internal combustion engine having two or more cylinders, with a cylinder head having four valves per cylinder and provided with at least two turbo-compressor units, in which, with each combustion chamber separated by an imaginary line along the longitudinal axis of the cylinder head, an exhaust valve and an induction valve provided with the associated ducts connected to the first of the two turbo-compressor units are located on a first side of the imaginary line, while the other two valves lie in the half of the combustion chamber on the other side of the imaginary line and are connected to the second of the two turbo-compressor units.

Abstract: A device regulates the fuel delivery from a fuel injection pump to the cylinder of an internal combustion engine by means of two secondary chambers connected respectively to the induction manifold and Venturi tube, and a main chamber open to the outside, so that pressure variations in the Venturi tube and manifold cause the diaphragms of the respective chambers to move, thereby acting upon mechanical transmission means to control a regulating component of the injection pump.

Abstract: Lean air/fuel mixture is supplied to the induction manifold of an Otto cycle engine through a heat exchanger heated by engine exhaust gases under normal running conditions, and under idling conditions mixture is supplied to an auxiliary induction manifold solely through an auxiliary duct. The auxiliary duct is wound with an electrical resistive heating element to preheat the mixture upon cold-starting of the engine for a time, typically 30-40 seconds, determined by a timer switch.