Outboard motor with cowling

An outboard motor comprising a housing unit adapted to be mounted on an associated watercraft, an internal combustion engine disposed on the housing unit, and a cowling surrounding the engine, the cowling having a first inlet port through which atmospheric air enters inside of the cowling, the cowling substantially being made of a nonferrous metal, the cowling comprises an external wall portion and an internal wall portion together defining an airflow space, at least one of the external wall portion and the Internal wall portions has at least one projection extending into the airflow space, the air entering through the first inlet port communicates with the engine through the airflow space, the cowling defines a cavity below the airflow space that is sized to accommodate the engine, the cowling additionally comprises a partition dividing the airflow space into at least first and second airflow spaces, the second airflow space communicates with the engine, the external or internal wall portion has a first duct through which the first airflow space communicates with the cavity, and a second duct comprising a bottom opening and an upper opening positioned higher than the bottom opening, an elongated body of the second duct extending between the bottom opening and the upper opening and through which the cavity communicates with the second airflow space, the bottom opening of the second duct is positioned higher than a bottom opening of the first duct, a flow path for intake air flow, the flow path extends from the first airflow space, through the first duct, through the cavity, and then extends through the second duct into the second airflow space such that air in the second airflow space is drawn into the engine for combustion.

An outboard motor comprising an internal combustion engine, and a cowling surrounding the engine, the cowling comprising atop cowling member and a bottom cowling member, the engine being disposed primarily above the bottom cowling member, the top cowling member detachably affixed to the bottom cowling member, the engine having an air intake device, the cowling comprising an external wall portion and an internal wall portion together defining an airflow space through which air flows, the airflow space being coupled to the air intake device when the top cowling member is attached to the bottom cowling member, the cowling defines a cavity that is sized to accommodate the engine, the cowling comprises a partition dividing the airflow space into at least first and second airflow spaces, the external or internal wall portion has a first duct through which the first airflow space communicates with the cavity, and a second duet comprising a bottom opening and an upper opening being positioned higher than the bottom opening, an elongated body of the second duct extending between the bottom opening and the upper opening and through which the cavity communicates with the second airflow space, the bottom opening of the second duct is positioned higher than a bottom opening of the first duct, a flow path for intake air flow, the flow path extends from the first airflow space, through the first duct, through the cavity, and then extends through the second duct Into the second airflow space such that air in the second airflow space is drawn into the engine for combustion.