Abstract: In a valve operating system designed to open and close intake valves of an internal combustion engine by an electromagnetic force, a first electromagnetic driving device for electromagnetically driving a first intake valve capable of opening and closing a first intake valve bore and a second electromagnetic driving device for electromagnetically driving a second intake valve capable of opening and closing a second intake valve bore are controlled by a control device in a manner so that when the engine is in a predetermined operational state, the first intake valve is opened and closed in a condition in which the second intake valve has been closed and stopped. Thus, it is possible to produce a swirl equivalent to that produced by changing of the lift amount, to provide a reduction in consumed electric power and to achieve a reliable engine operation, e.g., starting.

Abstract: An improved pin for supporting a roller cam follower for use in an internal combustion engine block used in a high speed motor vehicle having open-ended cylindrical bores in which valve lifters reciprocate, a cam shaft with cams that reciprocate the lifters, and an engine block oil passage communicating between adjacent cylindrical bores intermediate the ends of the bores. The improved pin is cylindrical in shape and secured against rotation in two pin-receiving bores. The roller cam follower is rotatably supported on the pin. A primary oil passage for communicating with the engine block oil passage to facilitate the flow of oil between the bores is provided. The primary oil passage is displaced longitudinally from the pin and roller cam follower. A lubrication oil passage is located within the pin and has an inlet opening facing predominantly toward the primary oil passage and which is located in a portion of the pin that is in one of the pin-receiving bores of the body.