초록 ▼

An improved air-intake system and engine layout for use on a small watercraft provides for a lower temperature, vapor fuel/air charge with less water vapor content. The watercraft includes an engine-air intake system incorporating an air-intake box which inhibits the engine from intaking water prese

An improved air-intake system and engine layout for use on a small watercraft provides for a lower temperature, vapor fuel/air charge with less water vapor content. The watercraft includes an engine-air intake system incorporating an air-intake box which inhibits the engine from intaking water present in the engine compartment, especially during high speed maneuvering. An extended flywheel case is also provided that prevents water located in the engine compartment from being sprayed by moving parts directly into the air-intake box. Furthermore, the improved air-intake system of the present invention incorporates external air-intake valves that prevent water from entering the engine and propulsion compartments through the air intakes while the watercraft is in an inverted.

대표청구항 ▼

[ What is claimed is:] [1.] A small watercraft is comprised of a hull having a longitudinal axis and an engine compartment containing an engine, the engine including a plurality of cylinders and an output shaft arranged to lie generally parallel to the longitudinal axis, a flywheel carried by the ou

[ What is claimed is:] [1.] A small watercraft is comprised of a hull having a longitudinal axis and an engine compartment containing an engine, the engine including a plurality of cylinders and an output shaft arranged to lie generally parallel to the longitudinal axis, a flywheel carried by the output shaft on a rear side of the engine and generally covered by a flywheel casing, an impeller shaft coupled to said output shaft, an air intake system connected to the engine and communicating with each cylinder of the engine through intake passages in the engine, and an exhaust system connected to the engine and communicating with each cylinder of the engine through exhaust passages in the engine, the exhaust system extending from the engine exhaust passages to a discharge end that opens outside of the engine compartment, the exhaust system including a water lock located at least in part behind the engine with at least a portion of the flywheel casing being arranged between at least a portion of the water lock and at least a portion of the air intake system.