Abstract: The invention provides an apparatus for generating mist, having: a container adapted to accommodate a liquid, the container having an inlet for receiving an incoming fluid stream into the container, and an outlet via which an outgoing fluid stream exits the container; at least one agitator arranged in the container for agitating the accommodated liquid to generate droplets of the liquid; wherein the agitator is arranged to be driven by the incoming fluid stream, such that the generated liquid droplets are caused by the incoming fluid stream to form the outgoing fluid stream, and subsequently, exit the container.

Abstract: Disclosed is an engine fuel supply apparatus which can be made smaller in size and in which the amount of fuel in an air-fuel mixture can be increased with a fast response in correspondence with the operation of a throttle valve when the engine is accelerated rapidly. The fuel supply apparatus is provided with a fuel booster pump. A portion of an air-fuel mixture is introduced into a negative-pressure chamber of the fuel booster pump via a negative-pressure chamber channel, and the fuel booster pump is actuated. The actuation forces air in a pump chamber to flow into a pressure chamber, and fuel in a fuel storage chamber is temporarily supplied to a carburetor.

Abstract: A carburetor for increasing the efficiency and horse power of an internal combustion engine. The carburetor generally includes a body including a throat extending therethrough, a deflector plate extending inwardly towards a cross-sectional center within the throat, a venturi member extending within the throat downstream of the deflector plate and including a channel fluidly connected thereof, and a throttle plate disposed within the throat downstream of the venturi member. The deflector plate is directed towards the channel to redirect at least a portion of an air stream entering the throat through the channel to mix with a fuel stream injected within the channel. A water supply line injects a hot water stream within the throat downstream of the venturi member, wherein the hot water stream mixes with the fuel stream to atomize the fuel stream for vaporization within the internal combustion engine.

Abstract: A two-stroke engine with external fuel mixture generation in a carburetor. The engine including a suction funnel having an interior disposed upstream of the carburetor. The engine further includes a tapered insert having a narrow end and a wide end disposed in an area of an inlet port of the suction funnel. The insert at least partially defines the interior of the suction funnel, and the insert tapers in a flow direction of air flow from the wide end to the narrow end. Accordingly, a diameter of the interior of the suction funnel adjacent to the narrow end of the insert is substantially larger when compared to the narrow end of the insert.

Abstract: Apparatus sealably incorporating a fuel metering device and fuel processing device [200, 200a, 200b] for producing a stabilized fog of fuel droplets sized 50 microns and less that when mixed with combustion air burn completely, reduce or eliminate detonation (knock) in internal combustion engines and reduce fuel octane requirements. The apparatus [200, 200a, 200b] may include a carrier gas reservoir [216, 216a] closed to external carrier gasses. A heater [205] may be employed to flash into vapor a portion of the liquid fuel to develop a carrier gas. In embodiments for jet or turbine engines, bleed gas from the engine may be used to provide carrier gas through a fuel processor [254], or the fuel may be heated-by-heater [260] to flash some of the fuel into vapor to provide carrier gas through the fuel processor to produce the stabilized fog of fuel droplets.

Abstract: A fuel vaporizer includes an inner tube including a liquid fuel inlet for receiving liquid fuel and plural openings, a fuel vaporizing chamber formed on the inner tube, and comprising a fuel vapor outlet, an outer housing formed on the fuel vaporizing chamber, such that a reservoir is formed between the fuel vaporizing chamber and the outer housing, and a heating fluid inlet and heating fluid outlet which are connected to the outer housing.

Abstract: A carburetor arrangement of a portable handheld work apparatus includes a carburetor (1) which is fixed to a motor housing (4) of the work apparatus by elastic support elements (2, 3). A warm air channel (5) is provided for conducting warmed air (6) to the carburetor (1). At least one part of the warm air channel (5) runs through at least one support element (2, 3).

Abstract: A fluid vaporization system comprises a first fluid inlet for receiving a first fluid, a second fluid inlet for receiving a second fluid, and a first discharge aperture for discharging the first fluid and the second fluid. A first connecting passage connects the first fluid inlet and the second fluid inlet in fluid communication with the first discharge aperture, mixes the first fluid and the second fluid to define a fluid mixture, and delivers the fluid mixture to the first discharge aperture. A third fluid inlet receives a third fluid and a second discharge aperture discharges the third fluid.

Abstract: A fuel gasifier for an internal combustion engine having a gasification chamber, a device for injecting fuel into the chamber in droplets of about 30-50 microns or less in diameter, an ambient air inlet to the chamber with a flow control therefor, to admit a controlled amount of ambient air to mix with the fuel, a heater in the chamber to elevate the fuel temperature and convert the fuel to a gaseous state, a fuel and air mixing and transfer impeller in the chamber for increasing turbulence and propelling the mixture from the chamber, an annular venturi flow passage for flow of additional ambient air past the outside of the chamber, and a plurality of radial passages between the chamber and the venturi passage for flow of the turbulent mixture into the venturi passage and entrainment of the fuel and air mixture into the additional ambient air.

Abstract: A fuel vaporization device utilized in conjunction with an internal combustion engine which is serviced by a fluid circulating cooling system and a fuel supply system. The vaporization device comprises a compact chamber sealed by two end walls having inlet and outlet ports to allow straight-line flow of the engine cooling medium through a centrally positioned, fluid-tight heater tube. Fuel inlet and outlet ports are provided atop the chamber and a plurality of baffle members are systematically arranged along the heater tube to inhibit flow of the liquid fuel through the chamber and permit escape of fuel vapor through the outlet port. As fuel passes through the compact chamber, heat is exchanged from the cooling medium in the tube to the fuel in the chamber to cause vaporization thereof prior to carburetion or injection in an engine of a motorized vehicle. Use of the device reduces air pollution and improves fuel economy through more efficient fuel consumption.

Abstract: A continuous hot air intake for carburetor and fuel injection supplied engines that regulates the temperature of air mixing with fuel that is mixed in the carburetor or fuel injector prior to introduction to the cylinders of the engine. The invention includes preferably a heater and associated filter located at the air intake side of the carburetor that is activated by circulating heated fluid contained within the engine cooling system. The heater, in preferred form, is conveniently sized and circular in configuration so as to encircle the filter positioned at the air intake side of the carburetor, however, a circular filter can be used to encircle the heater. The heater and filter are encompassed by a releasably securable cover to hold these components together and in place and to block the entry of dust, dirt or other invading elements.

Abstract: The present invention proposes a fuel-air mixture-forming device for internal combustion engines, having a rotationally symmetric nozzle body (2) which, together with a rotationally symmetric throttle body (8) displaceable in it, forms a convergent-divergent nozzle which discharges into a radial diffusor (6). In the vicinity of the narrowest cross section (5) of the nozzle there is provided a fuel slot (11) extending around it and discharging into it, at least one fuel feed line (9, 10) discharging into the fuel slot. The radial diffusor is formed by a region of the nozzle body which is curved outward in the direction of flow of the mixture and by a wall (15) of a structural member (17) which forms a structural unit (18) with an intake manifold (7) of the internal combustion engine, the wall (15) lying opposite the nozzle body and being rotationally symmetric to the longitudinal axis (1) of the throttle member and having a bulge (16) pointing toward the throttle member.

Abstract: A flow system for an engine-pump assembly utilizes the engine cooling water for heating the engine carburetors to prevent icing thereof and includes a flow indicator providing a visual indication of the condition of the engine's cooling water flow.

Abstract: The invention is directed to an arrangement for controlling the intake air for the carburetor of a hand-held portable tool such as a motor-driven chain saw or the like. During winter operation, the cooling air that is heated by the engine cylinder is carried through a pass-through opening to the carburetor. During summer operation the pass-through opening is blocked by a slide that is pivotally mounted on a pivot axis. The slide selectively opens or closes the pass-through opening and is configured as a deflector which, in its open position baffles the heated cooling air from the engine cylinder and guides it toward the carburetor.

Abstract: Pre-cooled aerosol spray fuel/air mixture is discharged through an array of metering tubes which are housed within a heat exchange chamber. Engine coolant is circulated through the heat exchange chamber. As the aerosol fuel/air mixture is drawn from the carburetor through the metering tubes and into the manifold, heat transfer from engine coolant circulating through the heat exchange chamber causes the aerosol mixture in the metering tubes to vaporize. In a preferred embodiment, the temperature rise within the heat exchange chamber is limited by heat transfer to an air circulation tube which is coiled within the heat exchange chamber.

Abstract: A method and apparatus for operating an electric ignition, internal combustion engine that substantially improves the fuel efficiency by utilizing heat normally discharged to the ambient to condition and prepare the fuel mixture prior to entry into the combustion chambers. The apparatus comprises a fuel vaporizer (50) that transfers heat from the engine coolant system to the fuel mixture as it leaves a fuel introducing device such as a carburetor (38); a fuel mixture heater (52) for heating the mixture above the vaporization temperature of the liquid fuel; and, a mixture homogenizer (54) for thoroughly stirring the fuel mixture that is located in the fuel mixture flow path intermediate the vaporizer and heater.

Abstract: The invention comprises a carburetion apparatus for use with an internal combustion engine having a generally conventional carburetor, an intake manifold and an exhaust manifold. The carburetion apparatus has a central chamber that receives the fuel-air mixture from the carburetor and delivers the fuel-air mixture to the intake manifold. The central chamber is provided with baffles to divert the fluid flow and cause intimate mixing of fuel and air. The baffles are such that the manifold vacuum is raised (or, the pressure is lowered), so the vacuum assists in evaporating liquid fuel. The baffles may be heated by passing exhaust gases through them, the exit of the exhaust gas being slowed by a constricted outlet.

Abstract: Carburetor air-fuel mixtures are directed to a manifold having a plurality of long, small diameter helical tubes extending upwardly therefrom. An auxiliary air inlet having an auxiliary choke and an auxiliary air throttle supplies air to mixtures entering the tubes in response to engine temperature and carburetor throttle.Heated engine coolant flows upwardly through a jacket enclosing the tubes. An outlet manifold receives air-fuel mixtures vaporized in the tubes and directs them to the engine intake manifold. The carburetor is mounted on a block having an air-fuel passageway extending from a top inlet to a side outlet. The block is mounted atop a block having a passageway having a side inlet which receives vaporized air-fuel mixtures from the tubes to a bottom outlet in communication with the intake manifold.

Abstract: A thermodynamic method and system is described and claimed for up-grading the quality of digester methane gas by removing substantially all of the non-combustible carbon dioxide gas from the digester gas in a scrubbing system operated by the waste heat of an internal combustion engine utilizing the up-graded methane gas as its fuel source and driving a generator to produce electric power. In accordance with the invention, raw digester gas is compressed and blended with relatively cold water (absorbent). The compressed gas-water mixture is scrubbed in a contact tower with the result that an absorbent-condensed gas stream (primarily water and condensed carbon dioxide) is formed. The absorbent-condensed gas stream is removed from the tower, heated and expanded to release the carbon dioxide component of the stream as product CO.sub.2 gas.

Abstract: An internal combustion engine (1) includes a supplemental fuel passage (26, 27) which connects the carburetor (9) to the exhaust chest cover (28). A supplemental air inlet having a metering orifice (36) and passage (35) connects to the supplemental fuel passage. The resultant air-fuel mixture is heated before entry into the combustion chamber by passing the mixture through a heating passage (32) directly in front of the exhaust ports (13). When the engine is at idle with a completely closed throttle valve (19), the entire air-fuel supply for the engine is provided through the supplemental fuel and air passages and is heated in the heating passage prior to combustion. At increasingly open throttle, air-fuel is increasingly provided from the conventional primary carburetor output, with the heated air-fuel mixture being supplied in gradually decreasing amounts.

Abstract: A method and apparatus for operating an electric ignition, internal combustion engine that substantially improves the fuel efficiency by utilizing heat normally discharged to the ambient to condition and prepare the fuel mixture prior to entry into the combustion chambers. The apparatus comprises a fuel vaporizer that transfers heat from the engine coolant system to the fuel mixture as it leaves a fuel introducing device such as a carburetor; a fuel mixture heater for heating the mixture above the vaporization temperature of the liquid fuel; and, a mixture homogenizer for thoroughly stirring the fuel mixture that is located in the fuel mixture flow path intermediate the vaporizer and heater. The homogenizer is operative to compress the fuel mixture under certain engine operating conditions and the heater forms the intake manifold for the engine and includes branch flow paths and associated conduits that communicate directly with each combustion chamber through a valve controlled port.

Abstract: A monolithic variable jet carburetor comprising an air intake, an associated variable jet and an underlying fuel reservoir, all contained within a pressurized and heated chamber and whereby the fuel is injected into the reservoir under pressure and is atomized via an overlying wire mesh screen and vaporized as it traverses the remainder of the heated delivery path to the air intake. The heated chamber is adapted to heat the fuel at all points intermediate the float chamber and air intake venturi via hot engine gasses or heated engine coolant and wherein the float chamber is further pressurized via an air pump. Pressure/temperature sensors control the relative ratios thereof during normal engine cycling under various load conditions.

Abstract: A housing has an inlet arranged to be connected to the outlet of a fuel mixing device of an internal combustion engine such as a carburetor and an outlet arranged to be connected to the intake manifold of the engine. In a preferred embodiment of the invention, the housing has two or more spiral bores. These bores have a cross sectional area less than the cross sectional area of the outlet of the carburetor to provide increased time and velocity through the spiral bores and to isolate the carburetor from vacuum pulsations of the engine. The defining surfaces of the spiral bores is roughened to increase atomization. A second embodiment utilizes an elongated housing also having a spiral path for mixing the fuel and air.

Abstract: A variable venturi-type carburetor comprising a fuel passage which is open to an intake passage. An air bleed passage is connected to the fuel passage. The carburetor comprises an air bleed control valve device for controlling the flow area of the air bleed passage. The air bleed control valve device comprises a bore formed therein, a push rod slidably inserted into the bore for controlling the flow area of the air bleed passage, and a wax valve actuating the push rod. A cooling water passage is formed in the air bleed control valve device so as to surround the air bleed passage and the wax valve.

Abstract: A housing located between a conventional carburetor and the intake manifold inlet on a conventional internal combustion engine (such as that used in an automobile) has internal compartmentation to receive a volume of fuel and air mixture from the carburetor and to direct same through an outlet compartment and thence through a conduit to a fuel mixture heat exchanger mounted on the engine. The heat exchanger comprises one or more heat exchanger units each having a closed cylindrical housing with a plurality of closed, individual fuel mixture conduits therein (such as copper tubing). Each cylindrical housing is connected by a conduit, such as a hose, to the hot air exhaust manifold of the engine so that the heated air from the manifold is directed through each housing and around the heat exchanger tubes therein. A filter unit comprises a closed housing which receives the heated fuel through a porous screen baffle and a series of conventional ceramic or foam plastic or other types of filter material.

Abstract: A fuel supply system for internal combustion engines which utilizes an electronically controlled injection device for liquid fuel which is delivered to a heating chamber in the throttle body of a carburetor and vaporized so that gaseous fuel is delivered to the engine. Vaporization of the fuel is achieved by electric resistance elements and metered exhaust gases directed to the throttle body.

Abstract: A fuel system of an internal combustion engine includes a heat exchanger through one side of which hot engine coolant is passed as a heating medium, and through the other side of which a mixture of fuel and air is passed. The heat exchanger has substantial heat exchanging surface area and the path of the fuel air mix through the heat exchanger is relatively long. A bypass is provided by which fuel and air may bypass the heat exchanger during cold engine operating conditions.

Abstract: This carburetion system for automobiles serves to increase gasoline mileage greatly, and it consists primarily of a regulator for metering drops of fuel onto a motor-driven fan in a fuel and air mixing chamber. It further includes a heat expansion cylinder connected to the mixing chamber, so as to vaporize the mixture fully and completely by exhaust gases of the engine, prior to the fuel and air gas entering the cylinders of the automobile engine.

Abstract: A combined cooling and heating system for an internal combustion engine. The system includes a cooling jacket that cools the cylinder block and which discharges through a thermostatically controlled valve into a coolant sump having upper and lower outlets. The lower outlet discharges into a heating jacket for the induction system so as to provide induction system heating that is relatively independent of the engine speed. The upper sump outlet discharges into the cylinder head cooling jacket.

Abstract: An intake expansion chamber apparatus (10) for internal combustion engines is disclosed which preheats and expands the vaporized fuel/air mixture as the mixture flows between the carburetor and the combustion chamber. The apparatus includes an expansion chamber section (18) through which the fuel/air mixture flows between an inlet (20) connected in fluid communication with the intake manifold and an outlet (26) joined in fluid communication with the intake manifold at a location downstream from the outlet. The fuel/air mixture is heated during its passage through the expansion chamber by a heat transfer surface (30) to improve the vaporization and to more completely combust the hydrocarbons upon ignition. A safety valve (46) is provided to release pressure built up within the expansion chamber as during an engine backfire.

Abstract: An apparatus for producing a defined fuel vapor-air mixture for engines with an intake manifold. The apparatus including a float chamber and a vaporizing chamber accommodating a heated vaporizer surface. The intake manifold is provided with a first fixed restrictor or nozzle and a liquid space of the float chamber and a liquid space of the vaporizing chamber are connected with each other by a conduit. A gas space of the float chamber, as seen in a flow direction upstream of the first restrictor or nozzle, and a gas space of the vaporizing chamber as seen in a flow direction downstream of the restrictor or nozzle, are respectively connected to the intake manifold by means of conduits. A conduit from the gas space of the vaporizing chamber into the intake manifold is provided with a second fixed restrictor or nozzle causing a pressure drop of about 85%-99.99% of the first restrictor or nozzle.

Abstract: Apparatus for producing a combustible fuel/air mixture in which the fuel is completely vaporized for operating an internal combustion engine. Exhaust gases from the engine (40) pass through a heating manifold (8) in a vaporization chamber (2) to raise the temperature of a body of volatile liquid fuel in the bottom of the chamber. An air stream is also heated by passing it in heat exchange relation with hot exhaust gases from the engine. The stream of heated air is then drawn through an enclosed vapor space (6) at the top of the vaporization chamber, and fuel vapors are entrained therein. The fuel vapor-containing air stream is then mixed with additional air in a mixing chamber (26) to produce a combustible fuel/air mixture which is conveyed to the intake manifold (38) of the engine. Safety screens (64) are provided to prevent entry of sparks or flame into the fuel chamber.

Abstract: A vaporizer chamber includes a coil therein, the coil having extensions extending into the exhaust pipe of the engine, the exhaust gases passing through the coil and heating the interior of the chamber. Fuel is delivered to the vaporizer chamber, and vaporized there when the exhaust gases are heated. A thermostat unit is mounted on the exhaust pipe, and when heated, shifts a valve to direct the fuel to the vaporizer chamber, instead of to the carburetor. This shifting is gradual. A throttle controls the flow of vaporized fuel to the outlet of the carburetor. The usual accelerator pedal is operative for controlling the throttle for the vaporized fuel in unison with the usual throttle provided in the carburetor.

Abstract: An air/fuel mixture heating device for an internal combustion engine comprises a riser portion located at a relatively high position in the riser space in an intake manifold and having air/fuel mixture heating means and a barrier formed on a circumference of a riser surface of the riser portion, and an intake air inlet arranged in opposition to the riser surface for introducing intake air to the riser surface, thereby promoting the atomization of fuel particles by heating by the riser surface and by causing the fuel to pass by the barrier to distribute the fuel uniformly to respective cylinders of the engine.

Abstract: A liquid cooled internal combustion engine including a water heated plenum associated with the intake manifold and a temperature controlled plenum valve in the water line extending to or from the plenum and operable to control the flow of water. The temperature controlled plenum valve comprises a plastic body including a base wall and a peripheral wall and a plastic cap including a base wall and a peripheral wall surrounding the peripheral wall of the plastic body. The peripheral wall of the base has a radially outwardly extending annular rib and the peripheral wall of the cap has a radially inwardly extending rib. The ribs are adapted to pass over one another to provide a snap fit during assembly. The base wall of the body has integral O-ring retainer for retaining an O-ring. A bi-metallic disc is positioned in the body within the confines of the peripheral wall of the body and normally engages said O-ring and is operable to engage the O-ring when the water temperature exceeds a predetermined amount.

Abstract: A method and apparatus for producing an air/fuel vapor mixture for use in the combustion chambers of an internal combustion chamber which includes an enclosure into which ambient air is introduced with a heater for heating the ambient air together with a fuel vaporizer for vaporizing fuel injected into the enclosure and for mixing with the heated air and another heater for heating the resulting air/fuel vapor mixture which is subsequently conducted out of the enclosure to the combustion chambers of the internal combustion engine.

Abstract: A pressure feed, fuel injection carburetor including a carburetor base, a gassifier for gassifying a portion of the fuel-fed to the carburetor, a vacuum-operated shut-off valve connected to the gassifier permitting fuel flow only when vacuum is present downstream of acceleration dampers below the ventures of the carburetor, injection metering valves which are mechanically linked to the acceleration dampers for metering fuel to a pair of spray units mounted in the ventures, and an idle-speed fuel air mixture device for supplying air and fuel for idling operation of the engine attached to the carburetor. A richness sensor and adjustment apparatus can be provided between the shut-off valve and the pair of injection metering valves.

Abstract: A water cooled internal combustion engine, especially for utility vehicles operated with a gas which is stored in a liquid condition in a fuel tank. The internal combustion engine includes a cooling water cycle containing a thermostat, a cooler and a water pump. A fuel vaporizer is heated by the cooling water cycle of the internal combustion engine with an air intake preheater likewise being heated by the cooling water cycle. A throttle valve is arranged between the air/gas mixer and working cylinders of the engine. An externally heated water cycle is additionally provided in such a way that the externally heated water cycle is connected functionally in parallel with the cooling water cycle.

Abstract: An improved carburetor (20) for delivering one combustible fuel and a liquid, or two combustible fuels from separate reservoirs (50), (500), to the central portion of a hollow spray bar (98) for discharge into carburetor venturi (30) includes substantially closed metering chambers (90), (508) disposed in fuel flow communication from the reservoirs and suspended from opposite ends of spray bar (98). Fuels from metering chambers (90), (500) travel through variable width grooves (154), (548) formed in arcuate metering inserts (148), (544) into the lower end portion of corresponding metering arms (92), (540) and then into the hollow interior of spray bar (98).

Abstract: A gasoline fume generator and mixer for use with an internal combustion engine is disclosed. Liquid fuel is fed through a metering valve and flows over a hot heat exchange unit which is maintained at a temperature above 200.degree. F. by flow of engine coolant therethrough. The fumes generated by contact of the fuel with the heat exchange unit are mixed with air which is pulled into the generator tank by vacuum. This fume and air mixture is pulled out of the tank and into the carburetor to operate the engine in a conventional manner. A liquid level float actuated flow control device and a flap valve are provided to control the operation of the generator and a clean out plug is provided to allow periodic removal of portions of the liquid fuel which are not turned into fumes by the generator. An optional electric resistance heater is used to elevate the temperature of the liquid fuel entering the generator and mixer when needed, such as in cold weather and quick starts.

Abstract: A fuel preheater for an internal combustion engine directs incoming fuel from inlet manifold (40) against an end wall (22) heated by exhaust gas in conduit (14). The heated mixture is passed through a screen element (30) and traverses a helical path before entry into the intake manifold (50) of the engine. Heating of the mixture to a temperature between 427.degree.-482.degree. C. is disclosed as being advantageous to operation of the engine from the standpoint of noxious emissions.

Abstract: A fuel device for a gasoline engine. The device eliminating the sole use of a carburetor on the engine and supply the engine's intake manifold with an air fuel mixture pre-heated in a reactor housing. The air fuel mixture being heated by the engine's cooling system while the engine's exhaust fumes provide the air.

Abstract: A liquid vaporizing attachment is provided for a combustion engine including an air and fuel charge forming device defining an air and fuel passage extending therethrough, an induction passage inlet end for receiving an air and fuel charge from the charge forming device and an engine exhaust system. The attachment defines an intermediate passage extending therethrough including inlet and outlet ends communicated with the outlet end of the air and fuel passage and the induction passage inlet end, respectively. The intermediate passage includes heating structure operatively associated therewith for heating fluid flowing therethrough and liquid vapor injection structure for injecting a heated liquid vapor into the intermediate passage. The intermediate passage includes a horizontal major length portion thereof and upwardly and downwardly opening inlet and outlet end portions, respectively, defining the inlet and outlet ends of the intermediate passage.

Abstract: A carburetion system for metering liquid fuel for supply to an internal combustion engine. Liquid fuel is metered in a single bifurcated metering system by being flowed through a calibrated orifice in response to a proportional pressure reduction which is generated as the result of the summing of a venturi pressure reduction and an auxiliary pressure reduction. Metered liquid fuel is delivered through one branch of the metering system to the engine intake air downstream of the throttle at small and medium engine loads, and through the other branch to the engine intake air upstream of the throttle at large engine loads. Transitioning of fuel flow between the branches is automatic and occurs in response to pressure differences within the system. Fuel delivered to the engine intake air downstream of the throttle valve may be heated or otherwise treated to improve liquid fuel atomization or vaporization.

Abstract: A preheating device for the inlet manifold of an internal combustion engine, comprising at least one probe projecting into the exhaust manifold of the engine connected via a heat-conductive metallic rod or pipe to a second probe projecting into the inlet manifold, for transferring heat from the exhaust manifold to the fuel-air charge flowing through the inlet manifold. The probe disposed in the inlet manifold may be provided with an electrical heating element such as to preheat the interior of the inlet manifold prior to starting the engine, and providing heat to the fuel-air charge during cold starts of the engine.

Abstract: A carburettor or other mixture generator 1 for an internal combustion engine has a mixing chamber 3 which is surrounded by a tubular wall 2 and delimited at its ends by a throttle valve 4 and a choke 5. The wall 2 is double-skinned with a water heating chamber 10 between the skins. In order to heat the wall 2 and prevent the condensation of liquid fuel upon it, water from a cooling water circuit of the engine to which the carburettor is fitted is circulated through the chamber 10 under the control of a thermally operated valve 21. Since the cooling water will no heat the carburettor until the engine itself has become heated, the carburettor is also provided with electrical heating for cold starting purposes. The chamber 10 is raised so that when the engine cooling water pump is not operating the chamber 10 is empty and the inside skin 9 of the wall 2 is made of electric resistance heating material.

Abstract: A plate mounted between the carburetor and intake manifold having horizontally extending passageways and inlet and outlet ports communicating with four vertical apertures aligned with the passageways of the carburetor and intake manifold. Double-walled tubular heat exchangers, formed of spaced apart outer and inner jackets, are disposed in the vertical apertures, the spaces between the outer and inner jackets communicating with the plate passageways and being sealed from the inside of the inner jackets, such that engine coolant can be circulated through such spaces and through the plate to cause preheating of the fuel-air mixture as it passes through the inside of the exchangers and into the intake manifold. The inner periphery of each inner jacket has ring shaped serrations and a downward taper, which together with preheating by the heat exchangers results in significantly improved vaporization of the fuel-air mixture.

Abstract: The present invention relates to a system for preheating gas prior to entry into the carburetor and further preheating the air-fuel mixture passing from the carburetor into the intake manifold of the engine. In particular, the present invention entails a heat exchanger plate assembly disposed between the engine carburetor and the engine with openings provided therein for allowing the air-fuel mixture to pass therethrough. Additionally, the heat exchanger plate assembly includes a first compartment operatively connected to the engine cooling system and a second adjacent compartment operatively connected to the fuel supply line. The fuel is preheated by the exchange of heat between the first and second compartments, and further since the coolant fluid is circulated through the first compartment and the same is adjacent openings allowing the air-fuel mixture to pass from the carburetor to the engine, it follows that the air-fuel mixture itself is also heated by the heat exchanger plate assembly.

Abstract: Hot water is transmitted from an automobile's cooling system to a fuel vaporizer wherein it is used to heat gasoline to a vapor state. Air is added to the vapor by a fan, then forced to the carburetor. The flow of vapor into the carburetor is controlled by adjusting a vapor pickup within the carburetor's air cleaner. In this manner, the fuel-air vapor is more efficiently burned in the engine and better mileage is achieved.

Abstract: A fuel delivery system for an internal combustion engine, including a vaporizing chamber for combining liquid fuel and air to produce a vaporized fuel and air mixture, a vapor expander which communicates with the chamber for expanding and further vaporizing the mixture, and a metering device which communicates with the expander and with the engine for supplying engine vacuum to the system and controlling the amount of the mixture which is supplied to the engine. The vaporizing chamber includes a reservoir for storing a quantity of liquid fuel, an air inlet, a jet which sprays liquid fuel into the chamber, and a reservoir heater which heats the liquid fuel in the reservoir. The vapor expander includes a tubular passage communicating between the chamber and the metering device and a heating conduit coiled around the tubular passage to carry heated engine coolant and transfer heat to the mixture.