Marine propulsion device with means for supplying secondary air

Details Marine propulsion device with means for supplying secondary air Marine propulsion device with means for supplying secondary air

1993-09-28

1995-06-20

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

60302, 60307, 440 89, F01N 320

Patent

active

054252326

ABSTRACT:
Disclosed herein is a marine propulsion device comprising a combustion chamber, an exhaust passage, an air pump and a three-way catalytic converter. The air pump pumps air into the exhaust passage at or immediately upstream of the catalytic converter. By this construction the internal combustion engine can be run slightly rich, but the catalytic converter will see a close to stoichiometric mixture so that the pollutants in the exhaust stream can be oxidized or reduced appropriately since the catalytic converter will be able to operate as a three-way catalytic converter.

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