Abstract: A system and method for controlling randomly operable valves in an engine is presented. According to the method, valve lift is used to create a Helmholtz resonator from a deactivated cylinder. The method can reduce engine pressure based audible noise for variable displacement engines.

Abstract: A low drag fan assembly is provided which is adapted to be mounted within a ducting conduit of a ram air induction system of a vehicle for cooling a heat exchanger. The assembly includes a motor having an output drive; a motor bracketing system attached to the motor for suspending the motor within the ducting conduit; a fan hub attached to the output drive; and a plurality of foldable fan blades hingedly attached to an outer perimeter of the fan hub. When the motor is not activated, the plurality of fan blades are folded back in a non-deployed state which is generally longitudinally congruent to the airflow within the ducting conduit. When the motor is activated, the plurality of fan blades radially extend to a deployed state generally normal to and transverse to the airflow within the ducting conduit.

Abstract: A cooling system particularly suited for use in a small watercraft, which supplies coolant to, and evacuates coolant from, an engine of the watercraft. The engine includes an engine body defining at least one water jacket therein. An engine coolant supply passage desirably routes the coolant into thermal communication with a portion of an exhaust system, such as an exhaust manifold, before supplying the coolant to the water jacket of the engine. When the engine is shut off, coolant is permitted to drain from the water jacket through a drain passage. The drain passage is connected to the coolant supply passage at a position upstream from the exhaust system such that coolant draining from the engine travels in a reverse direction through the supply passage and is drained from the watercraft cooling system.

Abstract: A system for operating an internal combustion engine includes an intake valve moveable between a first position at which fluid is blocked from flowing to or from the cylinder and a second position at which fluid is allowed to pass to or from the cylinder. The system includes a fluid actuator selectively operable to hold the intake valve from moving to the first position during a portion of a compression stroke and a control valve configured to control fluid flow between a source of fluid and the fluid actuator. A fuel supply system supplies a predetermined amount of fuel to the cylinder at an appropriate time during an engine cycle based on at least one engine operating parameter, and a controller determines a need to de-rate the engine based on a sensed parameter relating to source fluid viscosity during a cycle in which the fluid actuator is not operated.

Abstract: A four-stroke internal combustion engine includes a crankcase with a bottom, an oil pan and an oil spray generating assembly. The oil spray generating assembly having a closed sidewall, a valve, a bottom cap and nozzles is attached to the bottom of the crankcase and is enclosed by the oil pan. The closed sidewall is formed at the bottom of the crankcase to define a mist chamber enclosed by the bottom cap. The valve is mounted in the mist chamber with a valve port defined through the crankcase and a resilient valve flap corresponding to the valve port attached to the bottom of the crankcase. The nozzles are respectively mounted in the bottom cap out of the mist chamber inside the closed sidewall. The operation of the engine will produce an oil vapor for lubrication with the lubricating oil flowing out of the nozzles.

Abstract: An outboard motor having an intake silencing box provided above a cylinder block in communication with combustion chambers is provided. The intake silencing box has left and right air induction passages located forwardly of exhaust passages and extending vertically downwardly between the exhaust passages and a skirt of a crankcase in a suspended fashion. The lower ends of the air induction passages open downwardly.

Abstract: In a heat storage tank, a discharge port of an introduction passage is covered by a cup-shaped collision member constructed by a shield portion and a guide cover. In addition, a mixture protection plate having plural through holes is disposed in a tank body between the collision member and an inner surface of the tank body. Therefore, a high-speed water stream, upwardly injected from the discharge port, collides with the shield portion, and turns its flow direction by an approximately right angle. Thereafter, the water stream is guided by the guide cover to a lower side of the mixture protection plate. Accordingly, it can prevent water stored in the tank body from being mixed even when the injection water stream has a high speed.

Abstract: Deflecting ribs are provided within a coolant jacket formed in a cylinder head in such a manner as to protrude upwardly from bottom walls for directing the flow of coolant toward exhaust-valve-port side port wall portions The deflecting ribs for deflecting part of the flow of coolant toward the exhaust-valve-port side port wall portions are formed in such a manner as to extend from the intake-valve-port side port wall portions, and gaps are left between the exhaust-valve-port side port wall portions and the deflecting ribs for allowing the coolant to flow along the wall surfaces of the exhaust-valve-port side port wall portions, whereby there is generated no stagnation of the coolant on the wall surfaces of the exhaust-valve-port side port wall portions at the portions where the gaps are formed.

Abstract: A cylinder head of an internal combustion engine is disclosed with an upwardly open spark plug tube (1), a connection thread (6) present on the end of the spark plug tube for screwing the spark plug into the cylinder head (3) and with a sleeve (2), which is inserted into the spark plug tube and accommodates the spark plug. The spark plug tube is provided with an increased diameter (D) cut through at right angles to a longitudinal direction thereof. A process for manufacturing such a cylinder head is described, in which the internal diameter (d) of the spark plug tube (1) is first increased to a diameter (D) that is larger than the external diameter of the sleeve (2) by a material-removing process, the spark plug tube (1) is subsequently cut through at right angles to its longitudinal direction, and the sleeve (2), wetted with the permanently elastic sealant, is finally inserted into the spark plug tube (1) and is adjusted therein.

Abstract: A rotary valve provides single point flow control of coolant within the cooling system of an internal combustion engine. The valve distributes coolant flow from the engine in predetermined flow modes to either 1) the radiator and heater simultaneously, 2) a bypass circuit only, 3) the heater only, or 4) the radiator and bypass simultaneously. The single-point coolant control results in advantages of shorter warm-up times, a lower pressure drop (reducing power consumption by the pump), reduced engine emissions and fuel consumption, improved cabin heater performance, and improved engine durability due to reduced thermal shocks to the engine components by virtue of more precise control of engine operating temperature.

Abstract: A lubricating oil tank for an engine unit arranged in a motor vehicle engine compartment, open from below, including a flat-shaped tank arranged in the compartment lower part, beneath the engine unit, and connected to the engine unit by an oil outlet conduit and by an oil inlet conduit connected to the engine oil pump. The tank includes a part connected to the oil outlet conduit and a lower part connected to the oil inlet conduit.

Abstract: Provided is a hanger arrangement for V-type vertical engines which not only allows the engine to be hoisted in a stable manner but also enhances the freedom in the design of the engine without interfering with other accessories and a hanger arrangement for outboard marine drives equipped with such an engine. A first and second hanger bracket are attached to outer sides of the cylinder heads, respectively, and a third hanger bracket is attached substantially centrally on an outer side of the crankcase. In particular, the third bracket is preferably located within the loop of an endless belt passed around a generator which is fixedly attached to the outer side of the crankcase.

Abstract: To accelerate a warming-up operation of an internal combustion engine and to quickly elevate a temperature of cooling water, a radiator side cooling water recirculation circuit E for recirculating the cooling water between an engine body 3 and a radiator 5, a heater side cooling water recirculation circuit F for recirculating the cooling water between the engine body 3 and a heater core 7, and a radiator bypass circuit G for recirculating the cooling water bypassing the radiator 5 are provided.