Brunswick Corporation

Anthony M Straub

Kenneth R Seymour, Ii

David J Belter

A cooling system of an outboard motor provides back and forth flow of water from one side of an exhaust passage to the opposite side in order to avoid the creation of stagnant pools of water within which minerals and debris can collect. This result is accomplished by causing the cooling water to flow back and forth from one side of the exhaust passage to the other so that all portions of the water passages are forced to conduct water through them at a relatively high velocity. A water reservoir is formed between an exhaust conduit and an oil reservoir in order to reduce the operating temperature of the oil within the reservoir.

Cooling system for an outboard motor

An exhaust system for a marine engine provides a flow directing component that reacts to changes in engine speed to select an appropriate and advantageous direction of fluid flow through the flow directing component. At speeds below a first threshold speed magnitude, such as an idle speed, exhaust gases pass from a first exhaust passage, through the flow directing component, and out of the marine propulsion device through an above-water exhaust conduit. When the engine is operating at speeds above a second threshold speed magnitude, the flow directing component operates according to Venturi principles to lower the pressure at its first end and draw ambient air through the second exhaust passage into the first exhaust passage.

Growing community of inventors

Fond du Lac, WI, United States of America

Anthony M Straub