Ventilation system for watercraft

A watercraft comprising a hull defining an engine compartment, an internal combustion engine within the engine compartment, a first and a second air duct extending at least from an opening in the hull into the engine compartment, the first and second air ducts both being positioned at substantially the same longitudinal position relative to the hull, a first induction box defining a first induction space around the first duct and a second induction box defining a second induction space around the second duct, and the first induction box has a forwardly facing opening and the second induction box has a rearwardly facing opening.

A watercraft comprising a hull defining an engine compartment, an internal combustion engine located within the engine compartment, a propulsion device carried by the hull and connected to the engine, an exhaust system for delivering exhaust gases from the engine to the environment, an air duct extending at least from an opening in the hull into the engine compartment, and an induction box rigidly secured onto the hull and defining an interior space, the induction box being substantially covered by a cowling and comprising packing material disposed between the induction box and the cowling, the induction box further having an opening and an edge that abuts the hull.

A watercraft comprising a hull defining an engine compartment, an internal combustion engine located within the engine compartment, a propulsion device carried by the hull and connected to the engine, an exhaust system for delivering exhaust gases from the engine to the environment, an air duct extending at least from an opening in the hull into the engine compartment, and an induction box attached to the hull so that an edge of the induction box generally abuts the hull and a lower portion of the induction box is spaced from the hull, the induction box defining an interior space and having an opening.

A watercraft comprising a hull defining an engine compartment, an internal combustion engine located within the engine compartment, a propulsion device carried by the hull and connected to the engine, an exhaust system for delivering exhaust gases from the engine to the environment, an air duct extending at least from an opening in the hull into the engine compartment, and an induction box attached to the hull and defining an interior space, the induction box having a generally rearwardly facing opening and an edge that abuts the hull.

A watercraft comprising a hull defining an engine compartment, an internal combustion engine located within the engine compartment, a propulsion device carried by the hull and connected to the engine, an exhaust system for delivering exhaust gases from the engine to the environment, an air duct extending at least from an opening in the hull into the engine compartment, and an induction box attached to the hull and defining an interior space, the induction box having an opening and an edge that abuts the hull, a portion of the outer edge being cut away, and the opening being defined between the cut away portion and the hull.

A watercraft comprising a hull defining an engine compartment, an internal combustion engine located within the engine compartment, a propulsion device carried by the hull and connected to the engine, an exhaust system for delivering exhaust gases from the engine to the environment, an air duct extending at least from an opening in the hull into the engine compartment, and an induction box attached to the hull and having a divider so as to define a first and a second enclosed space, each enclosed space having an opening and an edge that abuts the hull.

A marine drive comprising an internal combustion engine enclosed within an engine enclosure, the enclosure having a front end, a rear end, and sides between the front and rear ends, and a ventilation system comprising a first air duct extending at least from an opening in one of the sides into the engine enclosure, and a second air duct extending at least from an opening in one of the sides into the engine enclosure, a first induction box disposed on an outer surface of the side and defining a first induction space around the opening of the first air duct, a second induction box disposed on an outer surface of the side and defining a second induction space around the outer opening of the second air duct, the first induction box having a forwardly facing opening and the second induction box having a rearwardly facing opening, the induction boxes configured so that when air flows quickly across the boxes in a front end to rear end direction a positive air pressure is created around the forwardly facing opening and a negative pressure is created around the rearwardly facing opening.

A system for ventilating an engine compartment of a watercraft, the compartment having a plurality of sides, the ventilating system comprising a first duct extending into the engine compartment at least from a first opening in one of the sides, a second duct extending into the engine compartment at least from a second opening in one of the sides, a first induction chamber attached to an outer surface of the compartment and generally enclosing the first duct opening, and a second induction chamber attached to the outer surface of the compartment and generally enclosing the second duct opening, the first chamber having a forwardly facing opening and the second chamber having a rearwardly facing opening, and the first and second chambers are configured so that air flowing quickly over the chambers when the watercraft moves forwardly generates a positive pressure around the forwardly facing opening and a negative pressure around the rearwardly facing opening so that air flows into the engine compartment through the first duct and air simultaneously flows out of the engine compartment through the second duct.

A watercraft comprising a hull defining an engine compartment, an internal combustion engine located within the engine compartment, a first elongate air duct extending at least from an opening in the hull into the engine compartment, a second elongate air duct extending at least from an opening in the hull into the engine compartment, and an induction box attached to an outer surface of the hull and defining an interior space, the induction box having a first chamber and a second chamber, the first air duct opening into the first chamber and the second air duct opening into the second chamber, the induction box further having a generally forwardly facing opening that opens into the first chamber, and a generally rearwardly facing opening that opens into the second chamber.