Abstract: An outboard motor includes an engine, a water intake opening arranged to suck in water, and a water supply path arranged to supply the water sucked in through the water intake opening to the engine. The engine includes a water path arranged to cause the water supplied from the water supply path to flow in a water jacket of a cylinder head, a water jacket of an exhaust pipe, and a water jacket of a cylinder block in this order.

Abstract: An outboard motor includes a V-shaped 4-cycle engine including fuel injection devices that directly inject fuel into combustion chambers. The engine includes a left intake path including a left path extending from an intake port in a left bank in an obliquely rearward and rightward direction, and a right intake path including a right path extending from an intake port in a right bank in an obliquely rearward and leftward direction. The left fuel injection device is located to the right of a cylinder axis line in the left bank. The right fuel injection device is located to the left of a cylinder axis line in the right bank.

Abstract: An improved oil pump drive arrangement and pressure relief valve therefore for an internal combustion engine. The oil pump is disposed externally of the engine around a shaft that extends through the body of the engine. This extending portion of the shaft drives at least one engine accessory through a pulley which axially overlaps and circumferentially surrounds the oil pump housing to provide a compact engine construction.

Abstract: An internal combustion engine having a crankshaft, at least one camshaft, a balancer shaft and a timing drive for driving the camshaft and the balancer shaft from the crankshaft. The balancer shaft has a drive member that is interposed in the timing drive and a torsional vibration damper that is interposed between this drive member and the balancer masses on the balancer shaft to avoid transmission of crankshaft vibrations to the balancer shaft without effecting the valve timing. balancer shaft is provided that has at least offset balance masses formed thereon. The balancer shaft is also formed with integral bearings directly on opposite sides of each of the balance masses.

Abstract: An improved oil pump drive arrangement and pressure relief valve therefore for an internal combustion engine. The oil pump is disposed externally of the engine around a shaft that extends through the body of the engine. This extending portion of the shaft drives at least one engine accessory through a pulley which axially overlaps and circumferentially surrounds the oil pump housing to provide a compact engine construction.

Abstract: A variable valve timing mechanisms for an internal combustion engine wherein the timing of two cam shafts associated with the same combustion chamber of the engine may be driven at the same time interval and at the same speed from the engine output shaft and both cam shafts may have their timing adjusted simultaneously by a first variable valve timing mechanism and only one of the cam shafts may have its timing adjusted relative to the other cam shaft by a second variable valve timing mechanism to provide a simpler operational control and lower cost assembly. The variable valve timing cam drive arrangement also reduces the loading on the cam shaft bearings.

Abstract: A number of embodiments of V-type engine particularly adapted for transverse disposition in an engine compartment either at the front or rear of the vehicle. By appropriately staggering the cylinder banks and locating the various accessory drives, it is possible to make the engine more compact than previous engines and thus permits the use of V-type engines of more than 6 cylinders in such engine compartment placement. In addition, the induction system is designed in such a way so as to not only maintain a compact configuration, but also to reduce the number of plenum chambers that are employed and to permit a single plenum chamber that is disposed over the passenger compartment cylinder bank where the hood line is normally the highest. Thus, low hood lines can be maintained.

Abstract: An internal combustion engine having a crankshaft, at least one camshaft, a balancer shaft and a timing drive for driving the camshaft and the balancer shaft from the crankshaft. The balancer shaft has a drive member that is interposed in the timing drive and a torsional vibration damper that is interposed between this drive member and the balancer masses on the balancer shaft to avoid transmission of crankshaft vibrations to the balancer shaft without effecting the valve timing. balancer shaft is provided that has at least offset balance masses formed thereon. The balancer shaft is also formed with integral bearings directly on opposite sides of each of the balance masses.

Abstract: An improved porting and cylinder head arrangement for a multi-valve overhead valve internal combustion engine. The porting arrangement in the cylinder head permits the use of two separate and relatively large intake passages beneath which a fuel injector can be conveniently positioned without obstruction of the shape or configuration of these intake passages. A separate control valve body is fixed to the cylinder head for controlling the flow through the intake passages independently of each other while providing a common intake that can be valved by a single throttle valve.

Abstract: An accessory drive for an overhead cam internal combustion engine wherein the accessory may comprise a high pressure positive pump for a fuel injection system. The engine includes at least one camshaft that is rotatably journaled within a cam chamber formed by a main cylinder head member and a cam cover that is affixed to it. One end of this camshaft is journaled by a bearing cap that has a portion which extends forwardly beyond the cam chamber and which cooperates with the main cylinder head member to define a recess in which a portion of the housing of the accessory is contained and affixed. An accessory drive shaft extends through this mounting portion and is drivingly coupled to the camshaft end. If desired, this front bearing cap may also mount a timing sensor that will project through the cam cover.

Abstract: A number of embodiments of cylinder head constructions for internal combustion engines, wherein the intake and exhaust passages extend through the cylinder head and terminate in the respective upper and lower surfaces of the cylinder head so as to simplify machining. A number of variations and manifolding arrangements are also disclosed so as to permit the installation of the engine into an engine compartment and to provide a compact construction.

Abstract: A number of embodiment of cylinder head constructions for internal combustion engines, wherein the intake and exhaust passages extend through the cylinder head and terminate in the respective upper and lower surfaces of the cylinder head so as to simplify machining. A number of variations and manifolding arrangements are also disclosed so as to permit the installation of the engine into an engine compartment and to provide a compact construction.