Outboard motor with separated exhaust gas pulsing and exhaust ga

Details Outboard motor with separated exhaust gas pulsing and exhaust ga Outboard motor with separated exhaust gas pulsing and exhaust ga

1993-09-28

1994-12-13

Basinger, Sherman

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

60302, 60314, B63H 2132

Patent

active

053725301

ABSTRACT:
Disclosed herein is an outboard motor comprising an engine block assembly including a lower surface having therein first and second exhaust gas openings, upper and lower cylinders having respective axes parallel to the lower surface and including respective exhaust ports, an exhaust gas collector passage communicating with the exhaust ports, an exhaust gas pulse passage extending between the collector passage and the first exhaust gas opening, and an exhaust gas discharge passage extending between the collector passage and the second exhaust gas opening and including therein a catalytic element, a drive shaft housing fixed to the lower surface of the engine block and including a discharge gas duct terminating in an underwater discharge opening, and an exhaust gas housing located in the drive shaft housing and including an upper end fixed to the lower surface of the engine block, a lower end, an exhaust gas pulse passageway communicating, at the upper end thereof, with the first exhaust gas opening and being closed except for communication with the first exhaust gas opening, and an exhaust gas discharge passageway communicating, at the upper end thereof, with the second exhaust gas opening, communicating, at the lower end thereof, with the discharge duct in the drive shaft housing, and being independent of the exhaust gas pulse passageway within the exhaust gas housing.

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