Engine exhaust emission control system

摘要

An engine exhaust emission control system in an outboard engine (E) is provided. The exhaust emission control system has a catalyst unit (50) mounted in an engine block exhaust gas passage in the outboard engine (E). The catalyst unit comprises a catalyst carrier (70) having at least one catalyst element carried therein and a flexible porous bag (72) having at least a portion of the catalyst therein. The catalyst unit is formed to be positioned within the engine block exhaust passage so as to extend therealong and the catalyst unit is removably inserted and detachably mounted in the exhaust gas passage.