Four-cycle engine for marine drive

摘要

A four-cycle engine for a marine drive includes an improved construction. The engine has an air induction device for introducing air to a combustion chamber. The air induction device defines an intake port next to the combustion chamber. An intake valve is movable between open and closed positions of the intake port. A valve actuator is journaled on the engine body for rotation to actuate the intake valve at a set angular position. A variable valve timing (VVT) mechanism is arranged to set the valve actuator to the angular position between advanced and delayed angular positions. A dedicated oil pump supplies pressurized oil to an oil control valve, which regulates and controls the VVT mechanism. A lubricant oil pump supplies pressurized oil to an engine lubrication system.