Patent ID: 7536855
Filing Date: 2009-05-26
Classification: F01N

Abstract:
1. An exhaust system for a watercraft having an engine, the exhaust system comprising an exhaust conduit, the exhaust conduit having an exhaust gas passage through which exhaust gases discharged from the engine pass and a cooling water passage through which cooling water that has cooled the engine passes, a junction that merges the exhaust gases and cooling water, an exhaust control device comprising an exhaust control valve mounted so as to be moveable over a range of motion and positioned such that the entirety of the exhaust control valve, at all positions in the range of motion of the exhaust control valve during operation, is upstream from the junction, and a water lock positioned downstream from the junction, the exhaust control device being configured to control an opening of the exhaust control valve in response to an operating condition of the engine.