Automatically controlled exhaust assembly for marine stern drive

Details Automatically controlled exhaust assembly for marine stern drive Automatically controlled exhaust assembly for marine stern drive

1990-02-07

1991-02-26

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Divider, collector, valve means, or boundary layer device...

440 89, B63H 2132

Patent

active

049952331

ABSTRACT:
A stern drive marine propulsion system (2) has an inboard engine (4) with an exhaust (6), an outboard drive unit (8) and propeller (14) operatively coupled to the engine and separated therefrom by a transom (10) having two exhaust passages (28 and 34) therethrough, and an exhaust control assembly (16) having an inlet (18) connected to the engine exhaust, first and second outlets (22 and 24) communicating with respective exhaust passages extending aft through the transom, and a valve (26) in the assembly having a first condition (26a) providing communication of the inlet with the first outlet, and a second condition (26b) blocking communication of the inlet with the first outlet. Automatic control circuitry automatically controls actuation of the valve between the first and second conditions in response to a given parameter.

REFERENCES:
patent: 4178873 (1979-12-01), Bankstahl
patent: 4504238 (1985-03-01), Neisen
patent: 4573318 (1986-03-01), Entringer et al.
patent: 4773215 (1988-09-01), Winberg et al.

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