Abstract: An exhaust muffler for small marine craft that can be located in the rear portion of the bilge and straddle the drive shaft and the shaft log. The muffler has a shell formed from sides, ends, top and bottom walls. The bottom wall is provided with a concave depression to receive the shaft and shaft log. A preferred configuration of the depression is a semi-conical surface having a base proximate the inlet wall. Further, the top and bottom walls are configured to conform to the undersurface of the deck and the inside of the hull, respectively. An inlet pipe, or a multiple number of inlet pipes, receive exhaust gases and water from the exhaust manifold of the craft engine and direct this combination into the muffler above a water pool. Gases pass through the water pool and exit through an outlet pipe (or a plurality of outlet pipes). A downwardly extending conduit within the outlet pipe(s) provides a correct amount of lift such that an amount of water exits the muffler which is the same as the amount entering.

Abstract: A marine engine exhaust system (10) and method for use with a marine engine. The exhaust system (10) includes a muffler body (20) defining an internal cavity (22) for receiving exhaust gases from a marine engine (12), the cavity (22) defining a reservoir portion (28) for holding water. The exhaust system (10) also includes at least one inlet passageway (24) communicating with the cavity (22) for receiving exhaust gases from the engine (12) and communicating them to the cavity (22). At least one water supply passageway (32) is provided which communicates with the cavity (22) and which is placed in fluid communication with a water supply such that water can be communicated to the reservoir portion (28). Further, at least one outlet passageway (40) is provided through which exhaust gases and water are ejected from the cavity (22). The outlet passageway (40) has an inlet port (42) disposed in the reservoir portion (28) of the cavity (22) and has an outlet port (44) exterior to the muffler body (20).