Abstract: In a two-cycle engine provided with crankshaft controlled fuel injection, fuel is supplied from a fuel tank to an inlet (23) having an adjusting means. The fuel flows via a connection (27) to a passage (39) in the crankshaft (13). Gaskets and O-rings are provided to seal off against the crankshaft and crankcase. The positions of the connection (27) and the crankshaft passage (39) are selected so as to obtain communication when underpressure prevails in the crankcase whereby fuel is sucked in and thrown out by centrifugal force via a nozzle (31).

Abstract: A cylinder block includes a cylinder with a piston therein and a main crankcase. A combustion space is disposed above the piston and a compression space is disposed below the piston. An exterior passage including a reservoir transfers compressed air from the compression space to the combustion space. A first valve permits one-way flow of ambient air into the compression space, and a second valve permits one-way flow from the compression space into the passage so that the compression process is independent of the combustion process. In one embodiment, the exterior passage includes a first passage for air and a second passage for fuel-air mixture for selective communication with the combustion chamber. In another embodiment, an inner crankcase is disposed within and spaced from the main crankcase and incorporates the first and second valves.

Abstract: A two-cycle engine is disclosed which conventionally includes a piston that reciprocates between a closed combustion chamber and crankcase. The piston reciprocates through a connecting rod that is eccentrically connected to the crank discs of a crankshaft. The crankcase is partially circular in configuration, and the crankdiscs conform in shape to the crankcase. Each crank disc has an annular recess or pocket extending around its periphery for approximately 180.degree. and in opposition to the eccentric point of connection of the connecting rod. The pockets cyclically communicate with a fuel inlet port and carburetor, both of which are positioned below the crankshaft rotational axis on the downstroke side of the crankcase. Fuel transfer passages between the crankcase and combustion chamber are positioned to receive the fuel charge from each recess as it is thrown tangentially upward with rotation of the crank discs.

Abstract: The present invention relates to a method for feeding the combustion chamber of a two-stroke engine, according to which the constituents of the combustible mixture are admitted into the combustion chamber via two intake devices at the bottom of the cylinder. Air without fuel is admitted through two ports, symmetrically disposed with respect to the vertical plane containing the axis of the exhaust port, directed towards the wall opposite the exhaust; the petrol-and-air mixture is admitted through at least one port remotest from the exhaust so that the stream of carburetted air is directed towards the cylinder head, the carburetted mixture thus being maintained towards the wall opposite the exhaust by the two streams of air without fuel until the ports are closed. The invention finds particular application in the field of automobile construction.