Marine muffler for water-cooled internal combustion engines

Details Marine muffler for water-cooled internal combustion engines Marine muffler for water-cooled internal combustion engines

1985-05-30

1987-02-17

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181239, 181254, 181272, F01N 304

Patent

active

046432728

ABSTRACT:
An exhaust gas silencing assembly or unit of the wet-type receives the exhaust gases from a water cooled internal combustion engine used to power a water-going vehicle, such as a speed boat, and the coolant water from the water jacket of the engine. The exhaust gas and water mixture may be expelled through a downwardly directed combined exhaust gas and water outlet of the silencing unit, or in response to opening a valve in an exhaust flow tube of the unit, exhaust gases and some of the water may be expelled directly out an outlet opening of the silencing unit. When the water and exhaust gases are expelled downwardly into the turbulent waters and foam of the wake of the boat the level of sound emanating from the silencing unit is substantially minimized. Upon opening of the valve at an outlet end of the silencing unit to provide straight through fluid flow the sound level of the engine is at a maximum, but the back pressure imposed on an engine is at a minimum for providing maximum engine performance. Alternate embodiments of the structure of the silencing unit are disclosed.

REFERENCES:
patent: 1048435 (1912-12-01), Still
patent: 1709426 (1929-04-01), Beery
patent: 2069751 (1937-02-01), Couch et al.
patent: 2455965 (1948-12-01), Wohlberg
patent: 2725948 (1955-12-01), Keene
patent: 3296997 (1967-01-01), Hoiby et al.

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