Catalytic exhaust system for watercraft

Details Catalytic exhaust system for watercraft Catalytic exhaust system for watercraft

1999-01-20

2000-09-19

Sotelo, Jesus D.

Marine propulsion

Means for accomodating or moving engine fluids

Cooling for engine

440 88, B63H 2110

Patent

active

061203351

ABSTRACT:
A personal watercraft includes a catalytic exhaust system in order to reduce discharge of pollutants. The exhaust system includes an exhaust passage and a catalyzer that is located within an expansion chamber of the exhaust passage. A water jacket is provided adjacent the expansion chamber and a portion of water from the water jacket merges with the exhaust pipe at a merge point downstream from the catalyzer. The distance within the exhaust passage between an exhaust port of a combustion chamber and the front of the catalyzer and from the rear of the catalyzer to the coolant-exhaust merge point is such that a pressure wave from the combustion chamber reflects back from downstream of the catalyzer carries an exhaust/water mixture from the merge point upstream across the catalyst, thereby cooling the catalyzer. Also, an insertion port disposed in the exhaust system upstream of the catalyzer injects cooling water into the exhaust system, thus cooling the exhaust gases and the catalyzer.

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patent: 5702276 (1997-12-01), Nakase et al.
patent: 5788547 (1998-08-01), Ozawa et al.

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