Gearcase exhaust relief for a marine propulsion system

Details Gearcase exhaust relief for a marine propulsion system Gearcase exhaust relief for a marine propulsion system

1988-08-04

1990-03-27

Basinger, Sherman D.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

60319, B63H 126

Patent

active

049116657

ABSTRACT:
An exhaust relief outlet is provided in the lower end of a marine propulsion system lower unit for providing exhaust relief to an internal exhaust passage formed in the lower unit. The exhaust relief outlet is provided in the rear end of the lower unit and is disposed adjacent an area of restricted exhaust flow formed by converging walls of the internal exhaust passage. The exhaust relief outlet is located so as to discharge exhaust into the upper half of the path of the propeller as it rotates about a propeller shaft. The exhaust relief outlet both relieves exhaust pressure within the exhaust passage and provides controlled ventilation to the propeller for allowing increased acceleration and planning ability for a marine propulsion system.

REFERENCES:
patent: 3745964 (1973-07-01), Henrich
patent: 3911852 (1975-10-01), Miller
patent: 4036162 (1977-07-01), Maier
patent: 4304558 (1981-12-01), Holdermann
patent: 4331429 (1982-05-01), Koepsel
patent: 4507892 (1985-03-01), Hall
patent: 4600395 (1986-07-01), Pichl
patent: 4773215 (1988-09-01), Winberg

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