Patent ID: 10174661

Abstract:
Apparatuses and methods are for cooling exhaust gas emitted from an internal combustion engine in a marine drive. An upstream exhaust conduit is configured to convey exhaust gas from the internal combustion engine. A cooling jacket is located on the upstream exhaust conduit. A cooling passage is located radially between the upstream exhaust conduit and the cooling jacket. The cooling passage is configured to convey cooling fluid along an outer periphery of the upstream exhaust conduit to a location where the cooling fluid is mixed with the exhaust gas. A downstream exhaust conduit conveys the exhaust gas from the upstream exhaust conduit. An orifice device is configured to radially outwardly spray the cooling fluid from the cooling passage onto an inner radial surface of the downstream exhaust conduit so that the cooling fluid cools the downstream exhaust conduit and mixes with and cools the exhaust gas.