Patent ID: 7552586
Filing Date: 2009-06-30
Classification: F01N

Abstract:
1. An exhaust system for a marine engine, comprising: a plurality of exhaust ports configured to direct exhaust gas away from a plurality of cylinders of said marine engine; a first exhaust conduit disposed in fluid communication with said plurality of exhaust ports; a catalyst housing structure; a second exhaust conduit disposed in fluid communication with said catalyst housing structure to direct said exhaust gas away from said catalyst housing structure, said second exhaust conduit being connected to a first portion of said catalyst housing structure; a catalyst device disposed in serial fluid communication between said first and second exhaust conduits, said catalyst device being configured to conduct said exhaust gas through said catalyst device from an inlet portion to an outlet portion of said catalyst device; an oxygen sensor disposed within said catalyst housing structure and in fluid communication with said plurality of exhaust ports and with said second exhaust conduit, said oxygen sensor being connected to a second portion of said catalyst housing structure; said catalyst housing structure having an upper portion, said exhaust gas flowing upwardly through said catalyst device into said upper portion, said upper portion having distally opposite upper right and left portions, said upper right portion being said first portion, said upper left portion being said second portion.