Marine propulsion system with a catalyst contained within the body of the engine

An engine of a marine propulsion system, comprising:

• an engine head portion having a first exhaust conduit formed integrally within said engine head portion;
• an engine block portion having a second exhaust conduit formed integrally within said engine block portion, said engine block portion and said engine head portion being attachable to each other at a connection plane to form said engine;
• said first and second exhaust conduits being connectable to each other in fluid communication at an intersection to direct exhaust from said engine head portion to an exhaust outlet of said engine, said first exhaust conduit being configured to direct said exhaust upwardly from said engine head portion toward said intersection, said second exhaust conduit being configured to direct said exhaust downwardly from said intersection to said exhaust outlet of said engine;
• a catalyst member;
• and
• a cavity formed within the body of said engine, said cavity being shaped to receive said catalyst member therein, said catalyst member being disposed within said cavity, said cavity being located at said intersection in an upper half of said engine, said catalyst member being retained within said cavity by the attachment of said engine head portion to said engine block portion.

An engine of a marine propulsion system, comprising:

• an engine head portion having a first exhaust conduit formed integrally within said engine head portion;
• an engine block portion having a second exhaust conduit formed integrally within said engine block portion, said engine block portion and said engine head portion being attachable to each other at a connection plane to form said engine;
• said first and second exhaust conduits being connectable to each other in fluid communication at an intersection to direct exhaust from said engine head portion to an exhaust outlet of said engine, said first exhaust conduit being configured to direct said exhaust upwardly from said engine head portion toward said intersection, said second exhaust conduit being configured to direct said exhaust downwardly from said intersection to said exhaust outlet of said engine;
• a catalyst member;
• and
• a cavity formed within the body of said engine, said cavity being shaped to receive said catalyst member therein, said catalyst member being disposed within said cavity, said cavity being located at said intersection in an upper half of said engine, said catalyst member being retained within said cavity by the attachment of said engine head portion to said engine block portion, said catalyst member comprising a plurality of passages formed therethrough, said plurality of passages being disposed generally in parallel association with a flow of exhaust through said cavity.

An engine of a marine propulsion system, comprising:

• an engine head portion having a first exhaust conduit formed integrally within said engine head portion;
• an engine block portion having a second exhaust conduit formed integrally within said engine block portion, said engine block portion and said engine head portion being attachable to each other at a connection plane to form said engine, said first and second exhaust conduits being generally parallel to each other and arranged to direct a flow of exhaust along generally vertical paths;
• said first and second exhaust conduits being connectable to each other in fluid communication at an intersection to direct exhaust from said engine head portion to an exhaust outlet of said engine, said first exhaust conduit being configured to direct said exhaust upwardly from said engine head portion toward said intersection, said second exhaust conduit being configured to direct said exhaust downwardly from said intersection to said exhaust outlet of said engine;
• a catalyst member;
• and
• a cavity formed within the body of said engine, said cavity being shaped to receive said catalyst member therein, said catalyst member being disposed within said cavity.