Marine engine exhaust assembly

In a marine engine exhaust assembly (7) adapted for connection to the dual water-exhaust discharge means (4) of a boat-mounted marine internal combustion engine (1), the combination comprising:

• (a) a pair of generally parallel upper intermediate tubular elbows (8) connectable at their forward upper ends to said engine,
• (b) a tubular bullhorn (11) having a pair of upper legs (12) connected at their forward upper ends to the lower rearward ends of said elbows, the lower portions of said legs merging through bends (13) into transversely extending lower pipes (14) having water-exhaust discharge portions,
• (c) and continous common water-exhaust passages of gradually diminishing cross-sectional area formed by said elbows (8) and their respective connected bullhorn upper legs (12), said last-named passages being axially linear in a forward to rearward direction,
• (d) the construction being such to provide water flow path control means contributing to minimizing exhaust back pressure at a connected engine.

In a marine engine exhaust assembly (7) adapted for connection to the dual water-exhaust discharge means (4) of a boat-mounted marine internal combustion engine (1), the combination comprising:

• (a) a pair of generally parallel upper intermediate tubular elbows (8) connectable at their forward upper ends to said engine,
• (b) and a tubular bullhorn (11) having a pair of upper legs (12) connected at their forward upper ends to the lower rearward ends of said elbows, the lower portions of said legs merging through bends (13) into transversely extending lower pipes (14) having water-exhaust discharge portions,
• (c) said elbows being circularly shaped (FIG. 4) adjacent their respective said upper ends and merging gradually downwardly into a generally elliptical shape at their said lower ends,
• (d) the construction being such to provide water flow path control means contributing to minimizing exhaust back pressure at a connected engine.

In a marine engine exhaust assembly (7) adapted for connection to the dual water-exhaust discharge means (4) of a boat-mounted marine internal combustion engine (1), the combination comprising:

• (a) a pair of generally parallel upper intermediate tubular elbows (8) connectable at their forward upper ends to said engine,
• (b) and a tubular bullhorn (11) having a pair of upper legs (12) connected at their forward upper ends to the lower rearward ends of said elbows, the lower portions of said legs merging through bends (13) into transversely extending lower pipes (14) having water-exhaust discharge portions,
• (c) said bullhorn legs (12) being generally elliptically shaped (FIG. 5) at their said upper ends for communication with the respective lower elbow ends, said legs merging gradually downwardly into a rectangular shape which extends from adjacent said bends (13) and along said lower pipes,
• (d) the construction being such to provide water flow path control means contributing to minimizing exhaust back pressure at a connected engine.

In a marine engine exhaust assembly (7) adapted for connection to the dual water-exhaust discharge means (4) of a boat-mounted marine internal combustion engine (1), the combination comprising:

• (a) a pair of generally parallel upper intermediate tubular elbows (8) connectable at their forward upper ends to said engine,
• (b) a tubular bullhorn (11) having a pair of upper legs (12) connected at their forward upper ends to the lower rearward ends of said elbows, the lower portions of said legs merging through bends (13) into transversely extending lower pipes (14) having water-exhaust discharge portions,
• (c) and water-exhaust separator plates (25) disposed in said respective lower pipes and with said plates forming separate water and exhaust passages in said pipes, said separator plates having upstream leading edges (28) disposed adjacent said bends,
• (d) the said leading edges (28) of said separator plates (25) being concavely curved,
• (e) the construction being such to provide water flow path control means contributing to minimizing exhaust back pressure at a connected engine.

In a marine engine exhaust assembly (7) adapted for connection to the dual water-exhaust discharge means (4) of a boat-mounted marine internal combustion engine (1), the combination comprising:

• (a) a pair of generally parallel upper intermediate tubular elbows (8) connectable at their forward upper ends to said engine,
• (b) a tubular bullhorn (11) having a pair of upper legs (12) connected at their forward upper ends to the lower rearward ends of said elbows, the lower portions of said legs merging through bends (13) into transversely extending lower pipes (14) having water-exhaust discharge portions,
• (c) and a gimbal housing (33) connected rearwardly of said bullhorn to said lower pipes and with said housing having front and rear ends and having a pair of elongated water-receiving pockets (38) disposed in communication with the said lower pipe discharge portions, said housing furthermore having drain holes (37) disposed generally intermediate said housing ends and communicating between said pockets and the housing exterior,
• (d) and said gimbal housing pockets (38) being shallow and terminating at their inner ends adjacent and in communication with said drain holes (37),
• (e) the construction being such to provide water flow path control means contributing to minimizing exhaust back pressure at a connected engine.

In a marine engine exhaust assembly (7) adapted for connection to the dual water-exhaust discharge means (4) of a boat-mounted marine internal combustion engine (1), the combination comprising:

• (a) a pair of generally parallel upper intermediate tubular elbows (8) connectable at their forward upper ends to said engine,
• (b) a tubular bullhorn (11) having a pair of upper legs (12) connected at their forward upper ends to the lower rearward ends of said elbows, the lower portions of said legs merging through bends (13) into transversely extending lower pipes (14) having water-exhaust discharge portions,
• (c) and a gimbal housing (33) connected rearwardly of said bullhorn to said lower pipes and with said housing having front and rear ends and having a pair of elongated water-receiving pockets (38) disposed in communication with the said lower pipe discharge portions, said housing furthermore having drain holes (37) disposed generally intermediate said housing ends and communicating between said pockets and the housing exterior,
• (d) and said gimbal housing pockets (38) being shallow and terminating at their inner ends adjacent and in communication with said drain holes (37), the said pocket inner ends being broadly curved (39) toward said drain holes,
• (e) the construction being such to provide water flow path control means contributing to minimizing exhaust back pressure at a connected engine.