Abstract: An object of the present invention is to realize both good cooling balance between two banks (2, 3) and good oil cooling performance, and further reduce temperature difference between the banks. A cooling system for a V-type engine according to the present invention causes the cooling water supplied from a water pump (10) to be distributed to the banks (2, 3) of the engine (1) after an oil cooler (15). The cooling water prior to cooling the engine can cool the oil sufficiently, and the cooling water after passing the oil cooler (15) is distributed to the banks (2, 3) equally so that no temperature difference arises between the banks. A connection tube (18) for communicating water jackets of the banks (2, 3) is integrally formed with a housing member (20) mounted on an end of the engine in a crankshaft direction. Since an existing flywheel housing (20) or the like is utilized, a separate pipe is not necessary, and therefore easy layout and size reduction are realized.

Abstract: An engine control system for an engine system with electromagnetically operated intake and exhaust valves has a control unit. The control unit is arranged to decide whether each of the intake and exhaust valves is put in an abnormal condition, to close a normal valve of the intake and exhaust valves when one of the intake and exhaust valves is put in the abnormal condition, and to stop the current-flowing to a primary ignition coil when one of the intake and exhaust valves is put in the abnormal condition and when the primary ignition coil is not starting the current-flowing.

Abstract: A housing includes a flange apertured to receive cap screws for temporary attachment to the block of an air cooled engine to enclose a piston rod and close a cylinder of the engine to protect engine parts from foreign matter. Oval flange openings accept cap screws for a range of cap screw patterns found in different engines.

Abstract: An internal combustion engine having a combustion heater is capable of enhancing an engine starting characteristic by improving warm-up of the engine and ensuring a sufficient oxygen content in intake air of the engine. An ECU executes, at the engine starting time, an augmentation control of augmenting the oxygen content in the engine intake air by an air blow fan. Under this augmentation control, the engine intake air is supplemented with the oxygen, and, with this supplement, the engine intake air becomes the intake air with oxygen content that is effective enough for starting the engine.

Abstract: A method of cooling a locomotive engine wherein the temperature of the coolant flowing into the engine is controlled in response to the temperature of the lube oil flowing out of the engine so that the difference between these two temperatures is limited to a predetermined value in order to limit the differential expansion between parts within the engine. The predetermined value may be a function of the lube oil temperature, and it may have an absolute maximum value. In the event that the temperature difference exceeds a predetermined value, the power output of the engine may be reduced as a function of the length of time that the temperature difference limit has been exceeded. The rate of change in coolant temperature may be limited during periods of decreasing lube oil temperature in order to limit the duty cycle demand on coolant system components.

Abstract: A device for regulating the cooling of a motor-vehicle internal-combustion engine has a fluid-cooling circuit coupled to a fluid pump feeding an installation for heating and/or air conditioning the passenger compartment of the vehicle, with adjustable air-heating parameters, including an air heater. It also has a device for establishing an engine-starting state on the basis of chosen conditions and a device which acts in this starting state for either stopping the pump if the heating demand is below a certain threshold or else for driving the pump as a function of a saturation rotational speed.

Abstract: A fluid cooled cylinder liner for mounting in a cylinder of an internal combustion engine is provided. The fluid cooled cylinder liner includes a collar and a seal element. The collar has an outer circumferential surface dimensioned with respect to the inner circumference of the cylinder so as to be in substantially fluid sealing contact therewith, an annular cooling fluid channel formed radially inwardly of the outer circumferential surface, and a radial bore extending radially from the fluid channel through the outer circumferential surface and having one end communicated with the fluid channel and an opposite end communicated with a branch bore of the crankcase of the engine. The seal element substantially seals the interface between the branch bore of the crankcase and the radial bore of the collar of the cylinder liner against the leakage of cooling fluid.

Abstract: A gas valve apparatus for an internal combustion engine having a combustion chamber. The gas valve apparatus includes a rotary intake valve located between an outer intake port and inner intake port at the combustion chamber and a rotary exhaust valve located between an outer exhaust and an inner exhaust port at the combustion chamber. Selectively actuatable gates are located at an outer intake and exhaust ports for controlling the opening, closing, and duration of opening of the outer intake and exhaust ports.

Abstract: A flow rate ratio of a radiator flow rate to a bypass flow rate is determined from pump water temperature, bypass water temperature and radiator water temperature. The relation between the flow rate ratio and a valve opening degree of a flow control valve is predetermined as a map. The valve opening degree is determined from the flow rate ratio and the map. Accordingly, the cooling water temperature at an inlet of a pump is accurately controlled without detecting the flow rate of the cooling water.

Abstract: An engine counterbalancing system has a counterbalance weight that reciprocates in a linear manner in opposition to piston movement. The counterbalance weight is preferably coupled to the crankshaft via two spaced link arms that engage two respective eccentrics of the crankshaft. The counterbalance weight is guided by one or more rails that are formed integrally on the inner surface of the crankcase housing.

Abstract: A reed valve is fitted in an intake port member formed on a crankcase of an engine and the flange of the reed valve is placed between the respective joining surfaces of the intake port member and an intake manifold. A water jacket is formed in a circumferential wall of the intake port member or the intake manifold, or water jackets are formed on both the intake port member and the intake manifold to cool the reed valve by cooling water for a forced cooling. When the water jacket is formed on the intake port member, a gasket of a metal is placed between the joining surface of the intake port member and the flange of the reed valve. The reed valve cooling apparatus can effectively cool the reed valve with cooling water.

Abstract: In an engine generating machine, a power-generating unit constructed by integration of the an engine and a generator, is housed in a case including an undercover and a pair of left and right side covers. A pair of reinforcing frames are coupled at their lower ends to the undercover and extend upwards along inner surfaces of the left and right side covers. The reinforcing frames have upper ends coupled to each other and are commonly fastened to a carrying handle. A fuel tank is supported inside the reinforcing frames, and a fuel pump and a fuel cock are mounted on the reinforcing frames. Thus, the maintenance of a fuel supply system for the engine can be facilitated, and the fuel tank can be protected while avoiding an increase in weight.

Abstract: A four-stroke engine with a lubrication system is disclosed. The engine includes intake and exhaust valves. A valve actuating mechanism opens and closes the intake and exhaust valves. The lubrication system includes a baffle plate unit that is located generally above the valve actuating mechanism. The baffle plate unit includes a baffle pate and a lubrication passage. The baffle plate is configured to guide blow-by vapors to a discharge port. The lubrication passage is configured to lubricate the valve actuating mechanism.

Abstract: A portable power working machine which is provided with an internal combustion engine (20) and is designed to minimize the clogging of an air cleaner (31) attached to the air intake system of internal combustion engine (20). For this purpose, part of air introduced into the main housing (12) by means of the cooling fan (25) is allowed to be sucked again by the cooling fan, thereby enabling it to be recirculated through the carburetor chamber (40) and a circulating air duct (50) disposed outside the carburetor chamber (40), and at the same time, part of air introduced into the carburetor chamber (40) is allowed to be introduced from the air cleaner (31) into the internal combustion engine (20).

Abstract: In an engine operated machine, an engine and a generator formed integrally with each other are covered with a shroud and a fan cover to form a power-generating unit. A head cover of the engine is mounted to protrude from an upper surface of the shroud, and the head cover is resiliently supported on a carrying handle of a case with a rubber bushing positioned therebetween. When the carrying handle is lifted, the weight of the power-generating unit is supported directly by the carrying handle without being applied to the case. Therefore, it is unnecessary to specially reinforce the case, thereby enabling a reduction in weight, and also increasing the degree of freedom of the design such as the shape and material of the case. Thus, when the engine operated machine is transported using the carrying handle, the weight of the engine and the working device can be reliably supported.

Abstract: A system and method for minimizing the likelihood of backfiring as a spark ignition, internal combustion engine is turned off. A fuel cut-off device stops the flow of fuel into the engine in response to an engine shut-off control signal, such as when the on-off keyswitch is moved from the “on” position to the “off” position. The ignition spark is maintained to the engine for a predetermined length of time after fuel shut-off. The delay time is selected to allow the fuel cut-off device to operate to stop the flow of fuel into the engine. In this way, for as long as the engine is turning over, the engine is provided with an electric spark for controlled ignition, thereby minimizing or eliminating backfiring.

Abstract: An engine fuel injection apparatus forms an airtight vaporization chamber having cylindrical sidewall and a flat, solid chamber bottom. A vapor fuel discharge line in fluid communication with the inside of the chamber. A fuel inlet orifice penetrates the sidewall through which a fuel line accesses the chamber, supplying fuel. The fuel supply line inside said chamber terminates with a float level controller such that a constant level of fuel is maintained in the chamber. Submersed below a level of the fuel to be maintained by the float level controller is an atomization device formed of a hollow, perforated plate near, but not at the chamber bottom. An air intake in fluid communication with the atomization device provides air intrusion. As fuel enters the bottom of the chamber from the fuel supply line coming from a fuel pump a mixture of fuel and air results and is sent to the fuel intake manifold of the vehicle.

Abstract: A control device for a cooling part-circuit and a heating part-circuit of an internal combustion engine. The cooling part-circuit includes a radiator and the heating part-circuit includes a heat exchanger. A delivery pump is connected to at least the cooling part-circuit and the heating part-circuit. The control device includes a rotary slide driven by a drive unit which is arranged in a valve housing. Provided in the valve housing are inlet or outlet openings for 1.) a cooling part-circuit which is connected to the radiator, 2.) a suction or pressure side of the delivery pump and 3.) at least two further part-circuits. The rotary slide is constructed as a substantially flat rotary disc with at least one control edge.

Abstract: An air-intake tube system for internal combustion engines with straight or V-type cylinder configuration having individual intake ducts providing adjustable length of air flow between and air-inlet chamber and the individual cylinders. A maximum duct length is obtained when a shortcut aperture in the intake duct is closed, whereas by opening the shortcut aperture the shortest length of air flow takes place between the inlet chamber and the cylinder. The inlet chamber is closed off by a unit having upper and lower flanges which can be selectively mounted on and demounted from a skirt-like wall of the air-intake ducts. The unit is provided with a self-contained closure-valve mechanism for the shortcut ducts. The lower flange of the unit forms a clearance space therebelow between the intake ducts, in which are disposed further structural elements, containing components which are connected to the cylinder heads of the internal combustion engine and are accessible for maintenance by removing the unit.

Abstract: An improved water jacket structure for a cylinder head that assists in transferring heat from a lower wall of the cylinder head to coolant flowing through passageway in the head. The passageway is defined in the cylinder head by the lower wall and an upper wall. The lower wall provides a plurality of cylinder top walls that overlie corresponding ones of the cylinders in the engine block. The upper wall includes a series of ribs that extend from the upper wall toward the lower wall. The ribs include an inlet rib, and a set of interconnected ribs. The interconnected ribs are disposed between adjacent cylinder topwalls. The set of interconnected ribs have first ends that are connected to one another, second ends that are spaced from one another, and a lower edge that is spaced a predetermined distance from the lower wall.