Exhaust gas cleaning system for a marine propulsion unit

Details Exhaust gas cleaning system for a marine propulsion unit Exhaust gas cleaning system for a marine propulsion unit

1991-05-21

1993-05-25

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60295, 60302, 60310, 60321, 440 89, F01N 328

Patent

active

052129497

ABSTRACT:
An exhaust gas cleaning system is provided for use with a watercraft engine. A plurality of horizontally positioned exhaust ports are located within an engine cylinder head. An exhaust manifold communicates with each of the exhaust ports at a first end and forms a gas collecting pipe at its second end. The second end of the gas collecting pipe is positioned above the exhaust ports. A generally horizontally positioned exhaust pipe extends from the second end of the gas collecting pipe and continues in a rearward direction. Means are provided for introducing coolant from the engine into the rearwardly extending portion of the exhaust pipe. A removable catalyst member is located within and across the exhaust pipe between the exhaust manifold and the area where coolant is introduced into the exhaust pipe. The catalyst is provided with a plurality of small holes therein, so that exhaust gases may be effectively cleaned. The invention is particularly adapted for use in a four-cycle inboard-outboard marine propulsion system.

REFERENCES:
patent: 4023361 (1977-05-01), Kojima
patent: 4573318 (1986-03-01), Entringer
patent: 4735046 (1988-04-01), Iwai
patent: 4831822 (1989-05-01), Yoshimura
patent: 4887427 (1989-12-01), Shinzawa
patent: 4927390 (1990-05-01), Kudoh
2,501,942-Jun. 1990-Japan.

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