Apparatus for diverting an exhaust stream

In an internal combustion engine a device for directing the exhaust flow of said internal combustion engine from the exhaust manifold of the engine either through a first line passing the flow to the exhaust muffler, or through a second line passing the flow to a heat exchanger for preheating the intake air/fuel mixture and then to the muffler, depending upon the operating conditions of the engine, said device comprising an aeromechanical element having an intake passage, said passage formed at one end to be coupled with said exhaust manifold and at its other end having a nozzle-like constriction, an enlarged passage connected to said intake passage at said constriction, a pair of outlets branching off from said enlarged passage and formed at their outlet ends to be connected to said first line and said second line, respectively, and deflecting means for deflecting the flow from one outlet to the other comprising at least one control line connection arranged in said enlarged passage and means for varying the air pressure at said connection for deflecting said flow.