Abstract: The present invention is concerned with a head for an internal combustion reciprocating engine, with a couple of spark-plugs for each combustion chamber, wherein the structure of the head is optimized in order to improve the preformance of the engine, and to secure the necessary structural stiffness.

Abstract: The device allows the physical quantity used for the feedback-governing of the supercharging pressure of an internal combustion engine to be corrected as a function of ambient air temperature.

Abstract: The invention relates to an exhaust system for a multicylinder internal combustion engine comprising at least a manifold formed by individual exhaust ducts connected to the engine's cylinders, connector pipes, into which groups of individual ducts come together, a common exhaust pipe into which the said connector pipes join each other, the silencer mufflers, wherein the system is characterized in that the said silencer mufflers are positioned in correspondence of at least an end of said common exhaust pipe.

Abstract: This invention relates to a device for correcting functional quantities of an internal combustion engine in accordance with detonation. The correction is made by comparing the amplitude of a vibratory signal indicative of detonation with a reference signal.In order to cause the correction to take place, a sensitivity factor is used multiplied by a correcting constant which depends on the value of the reference signal or on the ratio of the reference signal to the reference signal in the absence of detonation, this being an index of the basic characteristics and operating state of the engine and transducer.

Abstract: A device for controlling the flow pattern of the exhaust gas of a supercharged internal combustion engine comprises a diverging conduit disposed at the outlet of an exhaust gas operated centripetal turbine, a radially finned conduit portion, a converging conduit and an exhaust pipe for conveying the gas to atmosphere. The back pressure at the engine exhaust is thus minimized.

Abstract: A fuel feeding system for internal combustion engines, of the type comprising a carburettor with a throttle controlling the main flow of fuel-air mixture to the cylinders, the carburettor further comprising a pre-mixing chamber for the air-fuel mixture, which communicates with the engine intake duct by means of ports located both upstream and downstream of the throttle in its closed condition, said pre-mixing chamber feeding also with air-fuel mixture a secondary chamber, communicating both with the atmospheric air and with the intake duct downstream of the said throttle, whereby the fuel-air ratio is kept constant both at idling and at low RPM of the engine.