Marine propulsion unit

摘要

Several embodiments of internal combustion engines for use in outboard motors that permits a compact construction. This is achieved by having the intake ports of the cylinder head have a U-shaped configuration and positioning the induction system on the side of the engine with the charge former extending into a recess formed by the cylinder block above the crankcase. Intake pipes extend along the side of the crankcase and are served by a plenum chamber that is spaced from the crankcase. Both V and in-line engines are disclosed.