Patent ID: 7476136
Filing Date: 2009-01-13
Classification: F01N

Abstract:
1. An internal combustion engine comprising: at least two cylinders; each cylinder having a piston reciprocating therein and an exhaust port associated therewith for exhausting combustion gases therefrom, the exhaust port of each cylinder being opened and closed by reciprocating motion of that cylinder's piston; exhaust conduits, one conduit associated with each of the cylinders, each conduit having an inlet, an outlet and an end, the outlet being disposed between the inlet and the end, the inlet of each conduit being in fluid communication with the exhaust port of the cylinder with which that conduit is associated; an aperture fluidly communicating two of the exhaust conduits together, the two exhaust conduits fluidly communicating together having a common wall, the aperture being disposed in the common wall; and a valve having a first position closing the aperture and allowing pressure waves from each of the cylinders communicating via the aperture to travel from the inlet of the conduit associated with that cylinder, through that conduit to at least a point in that conduit further from the inlet than the aperture, and the valve having a second position opening the aperture allowing pressure waves from that cylinder to travel from the inlet of that conduit through the aperture and into the conduit associated with the other cylinder; the engine operating on a two-stroke principle.