Marine exhaust system with an exhaust flow directing device

Details Marine exhaust system with an exhaust flow directing device Marine exhaust system with an exhaust flow directing device

2006-07-11

2006-07-11

Olson, Lars A. (Department: 3617)

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

Reexamination Certificate

active

07074097

ABSTRACT:
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.

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