Abstract: Disclosed herein is a class of gas carburettor (9) for low calorific value gas for A/F ratio control to be used engines operating on producer gas with a load following capabilities. The gas carburettor has A/F ratio from 1.2:1 for producer gas to about 5:1 for biogas. The gas carburettor of the present invention has right A/F control at varying load conditions due to its optimized dimensions at the throat (7) and area ration control flapper (6) along with the zero pressure regulators. Additionally, using a by-pass facility starting the engine is established. By the use of a zero pressure regulator on the gas line, the gas pressure in the air and gas lines are maintained nearly the same downstream of the carburettor which helps in managing the appropriate air-to-fuel ratio based on the gas and air passage areas.

Abstract: A fuel system for a vehicle has a fuel tank, a fuel line in communication with the fuel tank, a carburetor having an inlet side and an outlet side, a return line connected to the outlet side of the carburetor and communicating with the fuel tank, and a nozzle positioned in the return line. The fuel line is connected to the inlet side of said carburetor so as to pass fuel into a fuel bowl of the carburetor. The nozzle has an orifice formed therethrough. The orifice of the nozzle has a diameter of between 0.005 and 0.050 inches. The nozzle is in sealed relationship with an inner wall of the return line.

Abstract: An air cleaner is used in a two-stroke internal combustion engine to supply an air-fuel mixture passage and a fresh air passage in a carburetor with air cleaned by an air cleaner element. The air cleaner includes an air cleaner base having an air-fuel mixture opening communicating with the air-fuel mixture passage and a fresh air opening communicating with the fresh air passage, and an air guide member provided at the air-fuel mixture opening. The air guide member is configured to curve near the air-fuel mixture opening and extend from there along the air cleaner base, and has a cross section surrounded by a peripheral wall. The air guide member defines a mixture-use air extension passage for air to be added to prepare an air-fuel mixture air-fuel mixture, which extends from a first clean air intake to the air-fuel mixture opening.

Abstract: In line carburetor (104) is mounted to a manifold (140) over the engine (800). The barrels of the carburetor deliver air/fuel suspensions to concentrated positions (152) of the manifold, with the concentrated positions being at opposite ends of the engine. The ports leading from the manifold to the runners are equally positioned about the concentrated positions (152) so that the runners are of substantially equal length and resistance, thereby providing more uniform delivery of the air/fuel suspension to the cylinders.

Abstract: A vehicle having moving funnels separated from stationary funnels that suppresses any decrease in intake efficiency. The moving funnels are arranged on an intake side of the stationary funnels to lead air to an engine. A funnel holding section holds the moving funnels and includes opened holes. The moving funnels are moved straight between separated positions in which openings of the moving funnels are separated from openings of the stationary funnels, and abutment positions in which the openings of the moving funnels abut against the openings of the stationary funnels. The opened holes pass air on an upstream side to a downstream side.

Abstract: A throttle assembly for intake air protects a link mechanism for interlocking throttles with each other from water and mud and maintains the throttle operability in a satisfactory state. The throttle assembly for intake air includes a plurality of throttle devices for injecting fuel into intake air to generate an air-fuel mixture; a link mechanism for connecting driving portions of the throttle devices with each other, a link mechanism housing chamber defined by an outer wall member for forming a link mechanism housing chamber and housing the link mechanism, and seal members provided at the connected or mated portions of the outer wall member and a different member or the connected or mated portions of a plurality of outer wall configuring members which configure the outer wall member.

Abstract: A fuel distribution apparatus for a V-type engine wherein first and second throttle bodies connected to first and second banks disposed in a V shape, respectively, are disposed therebetween and a main fuel distribution pipe for distributing fuel from a common fuel supply system is connected to first and second fuel injection valves provided in the first and second throttle bodies, respectively, is configured such that the fuel distribution pipe is formed from first and second distribution pipes separate from each other and connected to the first and second fuel injection valves and besides fastened to the first and second throttle bodies, respectively, a joint pipe connects the fuel supply to the first or second distribution pipes. Communication conduit connects the first and second distribution pipes.

Abstract: A mixture distribution device (1) for a combustion engine comprises a first mixture inlet (3), multiple first mixture outlets (4) and a first branch guiding structure (6). The mixture distribution device further comprises a second mixture distribution device (21) comprising a second mixture inlet (23), as well as multiple second mixture outlets (24) and a second branch guiding structure (26). An air/fuel mixture supplied to the first mixture inlet (3) is divided into a first fraction (7) and a second fraction (27) which is not collected and is collected, respectively, by the second mixture distribution device.

Abstract: An air cleaner device for exchanging an element without permitting dust and dirt collected between the element and an air guide member in a clean side to fall and for smoothly permitting intake air to be supplied to the engine. An air cleaner device includes a cylindrical element with an air guide member including a guide sleeve formed into a diameter smaller than an inner diameter between element inner walls of the element which are served for inserting the air guide member from one end of the element and flange portions which are formed on the guide sleeve to be brought into contact with one end surface of the element. A cleaner case houses the element and the air guide member and an air intake duct portion which is mounted on a lower portion of the cleaner case and is arranged below the air guide member.

Abstract: An intake system for a vehicle engine includes an air cleaner and a plurality of throttle bodies. The air cleaner encases an air cleaner element in an air cleaner housing for filtering air flowing from an unfiltered air chamber to a filtered air chamber of the air cleaner housing. The throttle bodies control the amount of air supplied from the filtered air chamber to a cylinder head. Operating noise of the throttle bodies is minimized by situating the throttle bodies within the air cleaner housing. Operating noise of fuel injectors associated with the throttle bodies is minimized by situating the fuel injectors within the air cleaner housing.

Abstract: A V-type two cylinder engine comprises: cylinders arranged forward and rearward such that they are inclined in V shape; a downdraft carburetor unit placed between the cylinders and including twin venturi bores provided for the respective cylinders and an air vent system making interior of carburetors communicate with atmosphere; intake manifolds each connecting a venturi bore of each of the carburetors to an intake port of a corresponding cylinder; and an air cleaner placed above the carburetors such that it covers the carburetors, and the carburetor unit is placed obliquely seen in a plan view according to positional difference between the cylinders in a direction of a crank shaft of the engine such that the venturi bore of each of the carburetors is closer to the intake port formed in a corresponding cylinder.

Abstract: A fuel supply system for use with an engine having four vertically-arranged cylinders and multiple charge formers prevents air or vapor pockets from accumulating within the fuel pump or fuel lines. A pair of fuel pumps are mounted vertically one above the other. A fuel inlet port of each pump is formed at the lower-most portion of the pump. A fuel discharge port is formed at the upper-most portion of each port. A conduit attached to the top fuel pump's discharge port supplies fuel to an uppermost and lowermost carburetor. A conduit from the lowermost fuel pump supplies fuel to the middle two carburetors. The uppermost carburetor's fuel inlet port is positioned vertically higher than the top fuel pump's discharge port. The second carburetor's fuel inlet port is positioned vertically higher than the second fuel pump's discharge port.

Abstract: A V-type two cylinder engine comprises: cylinders arranged forward and rearward such that they are inclined in V shape; a downdraft carburetor unit placed between the cylinders and including twin venturi bores provided for the respective cylinders and an air vent system making interior of carburetors communicate with atmosphere; intake manifolds each connecting a venturi bore of each of the carburetors to an intake port of a corresponding cylinder; and an air cleaner placed above the carburetors such that it covers the carburetors, and the carburetor unit is placed obliquely seen in a plan view according to positional difference between the cylinders in a direction of a crank shaft of the engine such that the venturi bore of each of the carburetors is closer to the intake port formed in a corresponding cylinder.

Abstract: A V-type engine has front (first) and rear (second) cylinders being offset to sides opposite from each other. The front (first) and rear (second) carburetors are mounted in alignment with the centers of the front and rear cylinders, respectively. The body of the front carburetor and the body of the rear carburetor are coupled to each other by linkage plates arranged in parallel with the line that joins the center of the front carburetor and that of the rear carburetor. The throttle shaft of the front carburetor and the throttle shaft of the rear carburetor are laid out perpendicular to the linkage plates and coupled to each other by means of a coupling linkage which is in parallel with the linkage plates. A throttle cable is connected to the throttle shaft of the front carburetor.

Abstract: A fuel system is provided with an accelerator pump. The accelerator pump has a single influent port and multiple effluent ports. The single influent port draws fuel from a single charge former into a fuel chamber of the accelerator pump. An operational linkage controls a release of the fuel such that the fuel in the fuel chamber is released into the charge formers during periods of rapid acceleration and like operating conditions. Upon actuation, the accelerator pump discharges an additional amount of fuel into multiple charge formers through the corresponding effluent ports of the accelerator pump. Accordingly, a single accelerator pump can be used with multiple charge formers to reduce to overall size of an assembled engine.

Abstract: To provide a mechanism for coordinating the operation of throttle valves in a carburetor system in which a plurality of carburetors are connected in series and are then arranged in parallel with one another so as to position shafts thereof in parallel with one another. The throttle valves are rotated on said shafts to open or close passages of the carburetors. In the throttle valve operation coordinating mechanism, each of the carburetors connected in series shares one shaft which is received in bearings positioned at opposite ends thereof. A link extends between the shafts of the carburetors arranged in parallel and coordinates the operation of the shafts.

Abstract: Disclosed herein is a four-stroke internal combustion engine comprising a common crankcase, a crankshaft extending in the crankcase, first and second cylinders respectively extending from the common crankcase in acute angular relation to each other and respectively including first and second cylinder walls respectively including first and second exhaust gas discharge ports, a passage connecting the first and second exhaust gas discharge ports, first and second pistons respectively located in the first and second cylinders and respectively connected to the crankshaft for reciprocating movement toward and away from the crankshaft and between top dead center and bottom dead center positions, first and second cylinder heads respectively connected to the first and second cylinders, respectively partially defining first and second combustion chambers, and respectively including first and second mixture inlet passages respectively communicating with the first and second combustion chambers, first and second exhaust

Abstract: A multi-cylinder engine structure includes a multi-cylinder engine body having a plurality of cylinders vertically arranged therein. A fuel feed system has a fuel pump connected to a plurality of carburetors disposed in a vertical arrangement sideways of the engine body in independent correspondence to the cylinders. The fuel pump is disposed below a lowermost one of the plurality of carburetors arranged vertically. An outboard engine includes a case tiltably mounted at a stern. A multi-cylinder engine body is contained in the case. A fuel feed system supplies a fuel to a plurality of carburetors disposed in correspondence with the cylinders. A fuel filter is also provided. The fuel pump is disposed below a lowermost one of the plurality of carburetors arranged vertically and above the fuel filter in a tilted-down state of the case.

Abstract: A multi-cylinder engine structure includes a multi-cylinder engine body having a plurality of cylinders vertically arranged therein. A fuel feed system has a fuel pump connected to a plurality of carburetors disposed in a vertical arrangement sideways of the engine body in independent correspondence to the cylinders. The fuel pump is disposed below a lowermost one of the plurality of carburetors arranged vertically. An outboard engine including a case tiltably mounted at a stern. A multi-cylinder engine body is contained in the case. A fuel feed system supplies a fuel to a plurality of carburetors disposed in correspondence to the cylinders. A fuel filter is also provided. The fuel pump is disposed below a lowermost one of the plurality of carburetors arranged vertically and above the fuel filter in a tilted-down state of the case.

Abstract: An outboard engine assembly for use on a boat has an engine mechanism including in an upper region thereof an engine having a substantially vertical crankshaft and a vertical array of substantially horizontal cylinders. The engine mechanism is mounted on the stern of the boat by an attachment. The attachment includes a stern bracket adapted to be fixed to the stern of the boat, a swivel case supported on the stern bracket for vertical angular movement, a substantially vertical swivel shaft supported on the swivel case for horizontal angular movement, and a pair of upper and lower supports mounted on the swivel shaft and supporting the engine mechanism. The engine has joint members coupled to the upper support at a position between adjacent two crankshaft counterbalances which correspond to adjacent two cylinders, respectively, as viewed in side elevation, the joint members having respective portions located within a path of the two crankshaft counterbalances as viewed in plan.

Abstract: An improved glow-plug engine for use with a model airplane of the type that includes an output shaft for driving a propeller, a needle valve for controlling a flow of fuel into a carburetor, and a fuel line formed from resilient silicone rubber is provided, wherein the improvement comprises a pinch valve for controlling the flow of fuel through the fuel line which is located farther away from the propeller than the needle valve so that the fuel flow may be adjusted by the fingers of the engine's operator more safely. The pinch valve includes a valve body for securing a section of the resilient fuel line, and a pinching mechanism including a control member that is accurately extendible toward and retractable from a secured section of the fuel line to constrict or expand the fuel flow path defined by the secured section of the fuel line. In one embodiment, control member is a cam mounted on a lever which in turn is linked to a servo-mechanism.

Abstract: An intake manifold for twin carburetors or twin air control throat bodies for a motorcycle or the like having one or more cylinders where the physical space is limited comprising a hollow central plenum chamber and hollow carburetor or air control throat body mounting flanges on each opposing side adjacently perpendicular to at least one side communicating with the intake track of at least one cylinder. In the case of two opposing cylinders, each cylinder communicates with the hollow central plenum chamber through opposing openings and the perpendicularly mounted carburetors or air control bodies. When a cylinder intakes a fuel mixture from the carburetors the fuel mixtures from each carburetor converge in the hollow plenum chamber where the direction of flow is turned toward the cylinder without physical impact with a physical structure during direction change. With the cause of air control throat bodies the air flowing through the manifold controls the flow of the air in the same manner as the fuel mixture.

Abstract: An in-line multicylinder outboard engine for an outboard engine unit including a vertical array of cylinders, a vertically extending crankshaft, a flywheel mounted on the upper end of the crankshaft, and a camshaft driver unit positioned between the flywheel and an upper surface of an engine block. The engine also includes a vertical array of intake/fuel supply devices connected respectively to pipes of an intake manifold. The uppermost intake/fuel supply device has at least a portion of it positioned below a plane in which the flywheel is rotatable and within a region defined laterally of the camshaft driver unit. The pipes of the intake manifold have equal lengths.

Abstract: An internal combustion engine comprising a crankcase adapted to rotatably support a crankshaft having an axis, the crankcase defining a plurality of crankcase chambers and including a generally flat manifold mounting surface including therein a first series of inlet openings aligned in the direction of the crankshaft axis, and a second series of inlet openings aligned in the direction of the crankshaft axis, the first and second series being laterally offset with respect to the direction of the crankshaft axis, and each of the inlet openings of the first and second series being respectively adapted to feed air to one of the crankcase chambers and having a minor dimension parallel to the crankshaft axis, a major dimension transverse to the crankshaft axis, and a portion overlapping the inlet openings of the other of the first and second series.

Abstract: A vaporizer unit has an enclosing casing including a plurality of tubes therein, defining a fuel passage therethrough, including the tubes. The tubes have coiled wire screen therein. An auxiliary carburetor is positioned at the inlet end of the fuel passage, and an outlet passage leads to the main carburetor of the automobile. The casing also defines an exhaust passage therethrough, transversely of the fuel passage, providing heat transfer between the exhaust gases and the tubes. The temperature of the resulting vaporized fuel is sensed for varying the flow of the exhaust gases and thereby controlling the temperature of the vaporized fuel, which is maintained at 250.degree. F. to 260.degree. F. An electric crystal is used for breaking down the heavy ends of the fuel. The rate of flow of air to the main carburetor is varied for correspondingly varying the rate of intake of vaporized fuel from the vaporizer unit.

Abstract: A fuel vaporizer for creating continuously variable stratified fuel vapor air mixtures at intake is described for use with internal combustion engines. Liquid fuel spread of the inner surface of a rotating heated cylinder evaporates into the intake air moving in pulses at approximately right angles to the liquid motion. The resulting fuel vapor air mixture is continuously variable stratified and the consequent delay gradients permit the use of compression ignition for the engine without excessive noise.

Abstract: A universal air cleaner cover base plate assembly for mounting standard size ring shaped air filters on closely spaced dual carburetors includes a pair of circular base plates formed with eccentrically located circular openings. The openings enable the base plate to be mounted upon the air cleaner flange of the carburetor body for rotative adjustment and their eccentric relationship to their base plates enables the center to center spacing of the filter elements to be adjusted independently of the fixed center to center spacing between two adjacent carburetors. The cover is of a generally rectangular configuration dimensioned to cover the tops of both air filters.

Abstract: An idling system for a multi-cylinder two-stroke engine as used in an outboard motor. Through a porting arrangement in the carburetor of at least one of the cylinders, the fuel supplied to that cylinder at idle and off-idle speed is reduced to a value so that the fuel-air ratio is too lean to fire. On rapid acceleration from idle speed, a charge of fuel is injected directly to the non-firing cylinder to provide smooth acceleration.

Abstract: A vapor fuel system for an internal combustion engine includes two vaporizing units for vaporizing liquid fuel and mixing it with air and a vapor heat exchanger for heating the fuel vapor-air mixture prior to its combustion in the engine. Hot fluid circulating in engine's cooling system flows through a jacket integrally surrounding each of the two vaporizing units and the vapor heat exchanger to provide a source of heat for vaporizing the fuel and heating the fuel vapor-air mixture. A fuel line carrying the liquid fuel to each of the vaporizing units passes through the hot fluid-filled jacket surrounding each of the units, thereby preheating the fuel before it is vaporized. In an alternate embodiment of the invention, two solenoid valves, one along the fuel line leading to each vaporizing unit, act in conjunction with a timing means to alternate periodically activation and deactivation of the vaporizing units.

Abstract: An intake device for an engine including the first intake valve located at the downstream end of the first intake passage that is connected to the primary carburetor. A second intake valve is located at the downstream end of the second intake passage that is connected to the secondary carburetor in a cylinder. Both intake passages are connected to each other through a pathway situated in the middle of said intake passages. A check valve located in said pathway allows flow from the first intake passage to the second intake passage. In accordance with a second embodiment, the primary and secondary carburetors are configured so that operation of the secondary carburetor is a function of negative pressure in the primary system to remain closed under minimal load conditions.

Abstract: A carburetor device for V-type internal combustion engines having first and second cylinders disposed in a form like V and first and second carburetors disposed between those cylinders and adapted to supply a gaseous mixture to the associated cylinders independently. The first and second carburetors are provided with first and second intake barrels, respectively, which adjacently intersect each other and have intake passages defined therein for communication with the corresponding first and second cylinders. The carburetors further include first and second float chambers located below a point of intersection of the intake barrels with their side surfaces partially opposed to each other. In the opposed surfaces of the float chambers are opened inlets of the fuel admission ports to which inlets are fitted the opening ends of two linearly-arranged distribution pipes of a T-type joint.

Abstract: A duplex carburetor for an internal combustion engine has a primary barrel having a primary venturi for supplying an air-fuel mixture to an intake manifold under a full range of engine loads and a secondary barrel having a secondary venturi for supplying an air-fuel mixture to the manifold under higher engine loads. The primary venturi has a cross section which ranges from 20% to 30% of that of the secondary venturi. The secondary barrel has a flattened cross-sectional shape such as of a segment of a circle of an ellipse, and is located adjacent to the primary barrel. The intake manifold is of a duplex construction having primary and secondary common passages connected to the primary and secondary barrels, respectively, of the carburetor. The secondary passage of the manifold has a flattened cross-sectional shape such as of a segment of a circle or an ellipse, and is positioned adjacent to the primary passage.

Abstract: Several embodiments of internal combustion engines offering improved performance in the form of improved fuel economy and reduction in the emission of unwanted exhaust gas constituents at idle and low speed operation. In each embodiment, an induction system is employed using a main intake passage and a sub-intake passage, each of which communicates with the combustion chamber through a respective port. The sub-intake passage has a substantially smaller cross-sectional area than the main intake passage so that a given mass flow through this passage will enter the combustion chamber at a higher velocity than that flowing through the main intake passage. Throttle valve means are provided for sequentially controlling the flow into the combustion chamber through the main and sub-intake passages.

Abstract: A carburetion system for V-type internal combustion engine having a first carburetor and a second carburetor disposed in a space between a first cylinder and a second cylinder arranged in a form like V and adapted to supply air-fuel mixture to respective cylinders independently, improved to have a compact structure and superior intake charging efficiency with capability of substantially uniformly supplying the mixture during acceleration and deceleration of the vehicle. The carburetors have intake barrels defining therein intake passages communicating with the associated cylinders. The intake barrels are disposed substantially at right angles to the axes of the associated cylinders and in the close proximity of each other in such a manner as to partially cross each other. A pair of float chambers are disposed between the intake barrels below the point of crossing of the intake barrels.

Abstract: A dual fuel system is disclosed which, when retrofitted to a standard gasoline engine of an automobile, permits the automobile to run on one of two fuels.

Abstract: A carburetor of an internal-combustion engine in an automotive vehicle has at least one main duct and an ancillary duct supplying an air/fuel mixture to a manifold, the fluid flow through the ducts being controlled by an accelerator via ganged butterfly valves of which the one in the main duct closes completely whereas the one in the ancillary duct closes only partially in an idling position. Separate nozzles deliver fuel to the main duct at a higher hydrostatic head and to the ancillary duct at a lower hydrostatic head, thereby preventing the aspiration of an excessive amount of fuel by the piston cylinders upon deceleration of the vehicle or during idling. The fuel is admitted to the ducts, between a Venturi throat and the butterfly valves, by nozzles fed from a common float-controlled pressure regulator, or from two such pressure regulators, to which the fuel is delivered by gravity from a buffer reservoir also provided with a float valve and connected to the high-pressure side of a fuel pump.