Patent ID: 8359843
Filing Date: 2013-01-29
Classification: F01N,F02B,Y02T

Abstract:
1. A marine engine exhaust system defining an exhaust passage extending from an engine exhaust manifold inlet to an exhaust system outlet, the exhaust system comprising: an exhaust manifold configured to merge multiple exhaust flows into a merged exhaust flow; and a catalytic conversion element arranged to intercept and catalyze the merged exhaust flow; wherein the exhaust system also defines a raw water coolant passage extending from a seawater inlet, through the manifold to a coolant exit open to the exhaust passage downstream of the catalytic conversion element, the coolant exit configured to cause seawater to be injected into the exhaust within the exhaust system; wherein the coolant passage extends between the catalytic conversion element and an adjacent external exhaust system surface, to remove heat generated by the catalytic conversion element and avoid excessive exhaust system surface temperatures; and wherein the coolant passage is spaced from the engine cylinder head.