Abstract: An intake system for internal combustion engines with multiple cylinders (10). The intake system includes a first distribution chamber (13), one separate inlet pipe (15a, 15b) for each engine cylinder, which inlet pipes extend between the first distribution chamber (13) and inlet valve/valves of the corresponding cylinders, and at least one second distribution chamber (16, 16a, 16b). This is connectable to each inlet pipe (15a, 15b) between said first chamber and the inlet valve via one corresponding passage, which can be opened by means of an operable throttle valve (19). Each second distribution chamber (16, 16a, 16b) is connected to the first distribution chamber (13) via at least one resonance pipe (14), the inlet of which to the second distribution chamber is openable by means of an additional throttle valve (17).

Abstract: A flow control valve including a movable part and a housing for accommodating the movable part may be produced by molding the components in sequential steps. Preferably, the housing is molded in a first step and the movable part is molded in an at least partially closed position in a second step in the same mold. This method enables the surface of the housing to serve as at least a portion of the mold for forming a substantially sealing portion of the movable part such that a very close tolerance between these components is achieved. The movable part is preferably a butterfly disc and the housing is preferably a butterfly valve housing.

Abstract: A flow control valve including a movable part and a housing for accommodating the movable part may be produced by molding the components in sequential steps. Preferably, the housing is molded in a first step and the movable part is molded in an at least partially closed position in a second step in the same mold. This method enables the surface of the housing to serve as at least a portion of the mold for forming a substantially sealing portion of the movable part such that a very close tolerance between these components is achieved. The movable part is preferably a butterfly disc and the housing is preferably a butterfly valve housing.

Abstract: A device at air filters of intake systems of internal combustion engines with fuel injection. The fuel pipe (21) is to a part of its length positioned in the air filter air space (14) of the housing (10), whereby a cooling of the fuel supplied is obtained.

Abstract: A device at an intake system for internal combustion engines incorporating a return conduit (17) for exhaust gases between exhaust side and intake side, in said return conduit a valve (18) controlled by the engine speed, a connection flange (16) between engine block (10) and intake manifolds (14), said connection flange having through openings (14') for intake air to the cylinders (1-6), and an exhaust channel (17') arranged in the connection flange along the edge thereof, means for connecting the exhaust channel via said valve (18) to the engine exhaust side, said exhaust channel having branch conduits (20), communicating with the different through openings (14').

Abstract: An internal combustion engine includes at least one valve flap mounted for swinging movement in the intake duct upstream in the cylinder intake valve. The flap is magnetically attracted to a closed position when an electromagnetic is activated, in order to effect a delayed charging of the cylinder. When the electromagnet is fully or partially deactivated, a pressure differential acting across the flap swings the flap open.