Patent ID: 8403717

Claim:
A marine propulsion system comprising an exhaust conduit conveying exhaust gases from an internal combustion engine, the exhaust conduit comprising a dry portion and a wet portion located downstream of the dry portion, wherein cooling fluid enters the exhaust conduit to cool exhaust gases flowing through the wet portion, and further comprising a bypass conduit connected to the exhaust conduit and conveying a portion of the cooling fluid away from the exhaust conduit; wherein the exhaust conduit comprises a transition portion located between the dry portion and the wet portion, wherein the bypass conduit conveys the portion of cooling fluid from the transition portion to the wet portion; where the bypass conduit comprises an inlet end connected to the transition portion, the inlet end receiving the portion of cooling fluid from the exhaust conduit, and where the bypass conduit further comprises an outlet end connected to the wet portion, the outlet end discharging the portion of cooling fluid back into the exhaust conduit; wherein the bypass conduit has a first portion extending generally perpendicularly from the inlet end relative to the exhaust conduit and a second portion extending transversely and at an acute angle relative to the exhaust conduit.