CARBURETING DEVICE
United States Patent 3648988
A double venturi device for supplying petrol to the throat of a carburetor for efficiently causing the petrol to vaporize. A portion of the petrol entering the double venturi passes through an inner venturi, while the remainder flows through a passageway between an inner and outer venturi.
US Patent References:
Carburetor
Baverey - June 1927 - 1631716
Carburetor
Sutton - August 1966 - 3269712
CARBURETOR NOZZLE
Marsee et al. - October 1969 - 3472495
Carburetor
Baverey - June 1927 - 1631716
Carburetor
Sutton - August 1966 - 3269712
CARBURETOR NOZZLE
Marsee et al. - October 1969 - 3472495
Application Number:
05/052268
Publication Date:
03/14/1972
Filing Date:
07/06/1970
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
261/DIG.039
International Classes:
F02M19/08; F02M19/00; F02M7/02
Field of Search:
261/DIG.39,78R,76
Primary Examiner:
Miles, Tim R.
Claims:
What is claimed is
1. In a carburetor, a carbureting chamber having an air inlet and a mixture outlet, a supply of petrol, a stream of air flowing in said air inlet to be mixed with said petrol and exiting through said mixture outlet, the improvement including: a first venturi carried in said carbureting chamber having an elongated cylindrical main body portion with an inner wall and an outer wall, said first venturi having an inlet end and an outlet end, a plurality of circumferentially spaced nozzles carried adjacent said inlet end of said first venturi, a second venturi having an elongated cylindrical main body portion slightly larger than the main body portion of said first venturi, said first venturi being carried in said second venturi defining a passageway between the main bodies of said first and second venturies, said second venturi having an inlet end and an outlet end, means for supplying petrol to said venturies from said supply of petrol allowing a portion of said petrol to flow through said nozzles in said first venturi, and a portion to flow through said passageway between said first and second venturies, whereby the vaporization of said gasoline by said air passing through said carburetor is increased.
2. The carburetor as set forth in claim 1, wherein said outlet end of said first venturi extends outwardly beyond said outlet end of said second venturi whereby petrol leaving said passageway meets with fresh air flowing through said carburetor for increasing the vaporization of said petrol.
3. In a carburetor, a carbureting chamber having an air inlet and a mixture outlet, a stream of air flowing through said carburetor, a supply of petrol, the improvement comprising: a first venturi carried in said carbureting chamber having an elongated main body portion, said first venturi having an inlet and an outlet end, a second venturi having an elongated main body portion slightly larger than the main body portion of said first venturi, said first venturi being carried in said second venturi defining a passageway between said main bodies of said first and second venturies, means for supplying petrol to said venturies from said supply of petrol allowing a portion of said petrol to flow into said first venturi for mixing with air flowing through said first venturi and allowing a portion of said petrol to flow into said passageway between said first and second venturies in contact with said main body of said first venturi, whereby said petrol flowing through said passageway is cooled increasing the temperature differential between said air flowing through said carburetor and said gasoline.
4. The carburetor as set forth in claim 3, wherein said first venturi has a plurality of circumferentially spaced nozzles carried adjacent said inlet end, and wherein said means for supplying petrol includes a divider ring carried on said first venturi adjacent said plurality of circumferentially spaced nozzles for directing said petrol into said first venturi and said passageway.
5. The carburetor as set forth in claim 3, further comprising an insulating cover carried on said second venturi for aiding in maintaining said temperature differential between the air flowing through said carburetor and the main bodies of said venturies.
6. The carburetor as set forth in claim 3, further comprising a passageway extending through said main body of said second venturi for allowing air flowing through said carburetor to pass therethrough in order to aid in vaporizing the petrol passing through said passageway.
7. In a carburetor, a carbureting chamber having an air inlet and a mixture outlet, a stream of air flowing through said carburetor, a supply of petrol, the improvement comprising: a venturi carried in said carbureting chamber having an elongated main body portion, said venturi having an inlet end and an outlet end, means encompassing said main body of said venturi defining a passageway between said main body of said venturi and said means encompassing said main body, means for supplying petrol to said venturi from said supply of petrol for mixing with said air flowing through said venturi and supplying petrol to said passageway in contact with said main body of said venturi for cooling said petrol flowing through said passageway, whereby as said petrol flowing through said passageway is cooled the temperature differential between said air flowing through said carburetor and said petrol is increased.
1. In a carburetor, a carbureting chamber having an air inlet and a mixture outlet, a supply of petrol, a stream of air flowing in said air inlet to be mixed with said petrol and exiting through said mixture outlet, the improvement including: a first venturi carried in said carbureting chamber having an elongated cylindrical main body portion with an inner wall and an outer wall, said first venturi having an inlet end and an outlet end, a plurality of circumferentially spaced nozzles carried adjacent said inlet end of said first venturi, a second venturi having an elongated cylindrical main body portion slightly larger than the main body portion of said first venturi, said first venturi being carried in said second venturi defining a passageway between the main bodies of said first and second venturies, said second venturi having an inlet end and an outlet end, means for supplying petrol to said venturies from said supply of petrol allowing a portion of said petrol to flow through said nozzles in said first venturi, and a portion to flow through said passageway between said first and second venturies, whereby the vaporization of said gasoline by said air passing through said carburetor is increased.
2. The carburetor as set forth in claim 1, wherein said outlet end of said first venturi extends outwardly beyond said outlet end of said second venturi whereby petrol leaving said passageway meets with fresh air flowing through said carburetor for increasing the vaporization of said petrol.
3. In a carburetor, a carbureting chamber having an air inlet and a mixture outlet, a stream of air flowing through said carburetor, a supply of petrol, the improvement comprising: a first venturi carried in said carbureting chamber having an elongated main body portion, said first venturi having an inlet and an outlet end, a second venturi having an elongated main body portion slightly larger than the main body portion of said first venturi, said first venturi being carried in said second venturi defining a passageway between said main bodies of said first and second venturies, means for supplying petrol to said venturies from said supply of petrol allowing a portion of said petrol to flow into said first venturi for mixing with air flowing through said first venturi and allowing a portion of said petrol to flow into said passageway between said first and second venturies in contact with said main body of said first venturi, whereby said petrol flowing through said passageway is cooled increasing the temperature differential between said air flowing through said carburetor and said gasoline.
4. The carburetor as set forth in claim 3, wherein said first venturi has a plurality of circumferentially spaced nozzles carried adjacent said inlet end, and wherein said means for supplying petrol includes a divider ring carried on said first venturi adjacent said plurality of circumferentially spaced nozzles for directing said petrol into said first venturi and said passageway.
5. The carburetor as set forth in claim 3, further comprising an insulating cover carried on said second venturi for aiding in maintaining said temperature differential between the air flowing through said carburetor and the main bodies of said venturies.
6. The carburetor as set forth in claim 3, further comprising a passageway extending through said main body of said second venturi for allowing air flowing through said carburetor to pass therethrough in order to aid in vaporizing the petrol passing through said passageway.
7. In a carburetor, a carbureting chamber having an air inlet and a mixture outlet, a stream of air flowing through said carburetor, a supply of petrol, the improvement comprising: a venturi carried in said carbureting chamber having an elongated main body portion, said venturi having an inlet end and an outlet end, means encompassing said main body of said venturi defining a passageway between said main body of said venturi and said means encompassing said main body, means for supplying petrol to said venturi from said supply of petrol for mixing with said air flowing through said venturi and supplying petrol to said passageway in contact with said main body of said venturi for cooling said petrol flowing through said passageway, whereby as said petrol flowing through said passageway is cooled the temperature differential between said air flowing through said carburetor and said petrol is increased.
Description:
This invention relates to an apparatus for supplying fuel to a carburetor, and more particularly to a double venturi which increases the temperature differential between air flowing through the carburetor and the temperature of the fuel.
Heretofore, venturies have been utilized to increase the vaporization of petrol, such as gasoline in carburetors. An example of such devices are illustrated in U.S. Pat. No. 1,631,716 granted to Braverey on June 7, 1927, and Pat. No. 1,384,429 granted to Cole on July 12, 1921. The main purpose of using venturies in carburetors is for dispersing the gasoline in the air stream flowing through the carburetor in order to provide vaporization of the gasoline. When the gasoline is not properly vaporized in the air such decreases the efficiency of the engine upon which the carburetor is being used. It also causes polution of the air by emitting from the engine an exhaust which contains an incompletely burned mixture.
In recent years due to the heavy concentration of automobiles and other vehicles within certain metropolitan areas the efficiency of the burning of the fuel within engines produces polution of the air which, in turn, is a health hazard, as well as irritates the eyes and contaminates the surrounding environment.
It has been found that by increasing the temperature differential between the air flowing through the throat of the carburetor and the petrol being mixed therewith, such increases the vaporization of the fuel, increasing the efficiency of the combustion within the engine. This not only eliminates the polution as a result of having a cleaner burn within the engine but increases the efficiency of the engine. When such is used on an internal combustion engine of an automobile the mileage of the automobile is also increased.
Accordingly, it is an important object of the present invention to provide a device for use with a carburetor of an engine which increases the temperature differential of the fuel being dispersed in the throat of the carburetor and the air flowing therethrough.
Another important object of the present invention is to provide a device for a carburetor which increases the vaporization of the petrol being used therewith.
Still another important object of the present invention is to provide a device which includes a double venturi wherein the petrol flowing through an inner venturi causes the main body of the inner venturi to be cooled, which in turn, cools the portion of the petrol flowing over the outer wall of the main body.
Still another important object of the present invention is to provide a simple and inexpensive device which may be readily mounted within the throat of the carburetor to increase the efficiency of an engine.
The construction designed to carry out the invention will be hereinafter described, together with other features thereof.
The invention will be more readily understood from a reading of the following specification, and by reference to the accompanying drawing forming a part thereof wherein an example of the invention is shown and wherein:
FIG. 1 is a side elevational view with parts shown schematically, of a carburetor including a fuel dispersing apparatus constructed in accordance with the present invention,
FIG. 2 is an enlarged exploded view showing the various components of the fuel dispersion apparatus, and
FIG. 3 is an enlarged vertical sectional view of the fuel dispersion device constructed in accordance with the present invention.
Referring in more detail to the drawing, FIG. 1 illustrates a conventional carburetor having a carbureting chamber, an air inlet B and a mixture outlet C. A conventional throttle valve is carried in the mixture outlet for controlling the flow of the mixture from the carburetor. A supply of petrol is provided for being mixed with a stream of air which flows in the air inlet B and out the mixture outlet C. A first venturi D is carried in a carbureting chamber A and has an elongated cylindrical main body portion with an inner wall and an outer wall. The first venturi D has an inlet end and an outlet end. A plurality of circumferentially spaced nozzles are carried adjacent the inlet end of the first venturi D. A second venturi is provide having an elongated cylindrical main body portion which is slightly larger than the main body portion of the first venturi D. The first venturi D is carried in the second venturi, producing a passageway F between the main body of the first and second venturies D and E. The second venturi also has an inlet end and an outlet end. Means is provided for supplying petrol to the venturies from the supply of petrol, allowing a portion of the petrol to flow through the nozzles in the first venturi, and a portion to flow through the passageway F between the first and second venturies D and E, respectively. An insulating cover is carried on the second venturi for aiding in maintaining the temperature differential between the air flowing through the carburetor and the main bodies of the venturies. Such increases the vaporization of the petrol.
The carbureting chamber A is a conventional carbureting chamber having an air inlet B and a mixture outlet C. The air entering the carburetor first passes through a filter 10, only a portion of such is shown, down through the air inlet B past a conventional choke 11 which is shown in the open position through the main passage of the throat of the carburetor, and out the mixture outlet C. Positioned within the mixture outlet C is a conventional throttle valve 12. The main passageway of the carburetor, which is defined by the wall 13, has a restricted portion 14 defining a venturi therein, which produces the highest velocity of the flow of air through the carburetor.
A reservoir 15 is provided in the housing of the carburetor for maintaining a supply of petrol, such as gasoline. The level of the petrol within the reservoir is maintained by a float operated valve 16. The gasoline flows out of the reservoir 15 through a passageway 17 which is normally provided with a metering valve, but is not shown herein, into a vertical chamber 18. A metering jet 19 is carried within the chamber 18 for controlling the flow of gasoline from the reservoir 15 to the downwardly extending passageway 20 extending through an arm 21. A conventional fuel regulating screw 22 is provided for regulating the fuel being supplied to the carburetor chamber during idling. The structure described above is conventional and is merely set forth to show one environment in which the petrol diffusing device, which includes the first and second venturies D and E, respectively, is utilized. It is understood, of course, that various types of carburetors can be equipped with the petrol diffusing device constructed in accordance with the present invention.
The first venturi D has a main body which includes a cylindrical portion 22 of a uniform diameter which is integral with a frustoconical shaped section 23. The frustoconical shaped section 23 has its smallest diameter end integral with the cylindrical portion 22. Integral with the other end of the cylindrical portion 22 is an outwardly extending shoulder 24. The inner wall 25 of the outwardly extending shoulder tapers inwardly. A plurality of circumferentially spaced nozzles 26 are disposed in the cylindrical portion 22 of the main body of the first venturi D for allowing passage of petrol into the first venturi. A divider ring 27 extends outwardly from the cylindrical portion 22, and provides a seal with the inner wall of the second venturi. A groove is defined between the divider ring 27 and the shoulder 24, so that the petrol can pass therethrough into the nozzles 26.
The second venturi has an inner diameter slightly larger than the outer diameter of the first venturi D and is complementary in shape therewith. The second venturi E has a cylindrical portion 28 which is uniform in diameter and is in a pressure fitting relationship with the shoulder 24 and divider ring 27 carried on the first venturi D. Integral with the lower end of the cylindrical portion 28 is a frustoconical shaped member 29, which terminates above the end of the frustoconical shaped member 23 forming a part of the main body of the first venturi. A cylindrical hole 30 is provided in the cylindrical portion 28 of the second venturi E for allowing the petrol flowing through the passageway 20 to enter into the groove so as to pass through the nozzles 26, as well as into the passageway F extending between the main body of the first venturi D and the main body of the second venturi E.
As the gasoline passes through the nozzles 26 into the first venturi it comes in contact with air flowing through the carburetor into an inlet end 31a of the first venturi. This causes the gasoline to vaporize. Such action cools the wall of the first venturi D causing the gasoline flowing through the passageway F between the first and second venturi D and E, respectively, to be cooled. This produces a temperature differential which aids in the vaporization.
An insulating cover 31 encompasses the second venturi E and has an inner diameter slightly larger than the outer diameter of the second venturi E so as to define an air gap 32 between the second venturi and the insulating member 31. The insulating member 31 has a cylindrical portion 33 of a uniform diameter and a frustoconical shaped portion 34, which tapers outwardly from the cylindrical portion 33. A plurality of passageways 35 extend through the cylindrical portion 33 of the insulating member 31 and the cylindrical portion 28 of the second venturi for allowing air to flow into the passageway F. Such enables the gasoline flowing into the passageway F through the passageway 20 to vaporize while in the passageway. As the mixture reaches the end of the passageway F such engages fresh air flowing through the throat of the carburetor and vaporizes further. The reason that the length of the main body of the second venturi is less than the length of the main body of the first venturi is to allow the mixture flowing out of the passageway F to strike fresh air as it exits therefrom.
The passageway 35 is defined by holes 36 carried in the insulating member 31 in alignment with holes 37 carried in the second venturi E.
It is noted that the tubular member 21 terminates in a cylindrical ring shaped member 38 into which the first and second venturies are press fit. The insulating member 31 is press fit onto the second venturi E. The first and second venturi and the insulating member 31 may be constructed of any suitable material, and in one particular embodiment is constructed of brass. The main criteria is to use a material of high heat conduction properties so that as the gasoline flows through the passageway F over the main body of the first venturi, such cools the gasoline. This, in turn, increases the temperature differential between the gasoline and the air flowing through the carburetor aiding in the vaporization of the gasoline. As the efficiency of the vaporization of the gasoline increases such increases the efficiency of the burning of the mixture within the engine upon which the carburetor is utilized. This, in turn, minimizes the pollution generated by the engine during its operation, and when installed on an automobile increases the mileage per gallon of fuel.
While a second venturi E has been utilized to define the passageway F, it is to be understood that the passageway can be defined by other suitable means for encompassing the first venturi D as long as the fuel flowing through the passageway is in heat transfer relationship with the wall of said first venturi D.
While a preferred embodiment of the invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.
Heretofore, venturies have been utilized to increase the vaporization of petrol, such as gasoline in carburetors. An example of such devices are illustrated in U.S. Pat. No. 1,631,716 granted to Braverey on June 7, 1927, and Pat. No. 1,384,429 granted to Cole on July 12, 1921. The main purpose of using venturies in carburetors is for dispersing the gasoline in the air stream flowing through the carburetor in order to provide vaporization of the gasoline. When the gasoline is not properly vaporized in the air such decreases the efficiency of the engine upon which the carburetor is being used. It also causes polution of the air by emitting from the engine an exhaust which contains an incompletely burned mixture.
In recent years due to the heavy concentration of automobiles and other vehicles within certain metropolitan areas the efficiency of the burning of the fuel within engines produces polution of the air which, in turn, is a health hazard, as well as irritates the eyes and contaminates the surrounding environment.
It has been found that by increasing the temperature differential between the air flowing through the throat of the carburetor and the petrol being mixed therewith, such increases the vaporization of the fuel, increasing the efficiency of the combustion within the engine. This not only eliminates the polution as a result of having a cleaner burn within the engine but increases the efficiency of the engine. When such is used on an internal combustion engine of an automobile the mileage of the automobile is also increased.
Accordingly, it is an important object of the present invention to provide a device for use with a carburetor of an engine which increases the temperature differential of the fuel being dispersed in the throat of the carburetor and the air flowing therethrough.
Another important object of the present invention is to provide a device for a carburetor which increases the vaporization of the petrol being used therewith.
Still another important object of the present invention is to provide a device which includes a double venturi wherein the petrol flowing through an inner venturi causes the main body of the inner venturi to be cooled, which in turn, cools the portion of the petrol flowing over the outer wall of the main body.
Still another important object of the present invention is to provide a simple and inexpensive device which may be readily mounted within the throat of the carburetor to increase the efficiency of an engine.
The construction designed to carry out the invention will be hereinafter described, together with other features thereof.
The invention will be more readily understood from a reading of the following specification, and by reference to the accompanying drawing forming a part thereof wherein an example of the invention is shown and wherein:
FIG. 1 is a side elevational view with parts shown schematically, of a carburetor including a fuel dispersing apparatus constructed in accordance with the present invention,
FIG. 2 is an enlarged exploded view showing the various components of the fuel dispersion apparatus, and
FIG. 3 is an enlarged vertical sectional view of the fuel dispersion device constructed in accordance with the present invention.
Referring in more detail to the drawing, FIG. 1 illustrates a conventional carburetor having a carbureting chamber, an air inlet B and a mixture outlet C. A conventional throttle valve is carried in the mixture outlet for controlling the flow of the mixture from the carburetor. A supply of petrol is provided for being mixed with a stream of air which flows in the air inlet B and out the mixture outlet C. A first venturi D is carried in a carbureting chamber A and has an elongated cylindrical main body portion with an inner wall and an outer wall. The first venturi D has an inlet end and an outlet end. A plurality of circumferentially spaced nozzles are carried adjacent the inlet end of the first venturi D. A second venturi is provide having an elongated cylindrical main body portion which is slightly larger than the main body portion of the first venturi D. The first venturi D is carried in the second venturi, producing a passageway F between the main body of the first and second venturies D and E. The second venturi also has an inlet end and an outlet end. Means is provided for supplying petrol to the venturies from the supply of petrol, allowing a portion of the petrol to flow through the nozzles in the first venturi, and a portion to flow through the passageway F between the first and second venturies D and E, respectively. An insulating cover is carried on the second venturi for aiding in maintaining the temperature differential between the air flowing through the carburetor and the main bodies of the venturies. Such increases the vaporization of the petrol.
The carbureting chamber A is a conventional carbureting chamber having an air inlet B and a mixture outlet C. The air entering the carburetor first passes through a filter 10, only a portion of such is shown, down through the air inlet B past a conventional choke 11 which is shown in the open position through the main passage of the throat of the carburetor, and out the mixture outlet C. Positioned within the mixture outlet C is a conventional throttle valve 12. The main passageway of the carburetor, which is defined by the wall 13, has a restricted portion 14 defining a venturi therein, which produces the highest velocity of the flow of air through the carburetor.
A reservoir 15 is provided in the housing of the carburetor for maintaining a supply of petrol, such as gasoline. The level of the petrol within the reservoir is maintained by a float operated valve 16. The gasoline flows out of the reservoir 15 through a passageway 17 which is normally provided with a metering valve, but is not shown herein, into a vertical chamber 18. A metering jet 19 is carried within the chamber 18 for controlling the flow of gasoline from the reservoir 15 to the downwardly extending passageway 20 extending through an arm 21. A conventional fuel regulating screw 22 is provided for regulating the fuel being supplied to the carburetor chamber during idling. The structure described above is conventional and is merely set forth to show one environment in which the petrol diffusing device, which includes the first and second venturies D and E, respectively, is utilized. It is understood, of course, that various types of carburetors can be equipped with the petrol diffusing device constructed in accordance with the present invention.
The first venturi D has a main body which includes a cylindrical portion 22 of a uniform diameter which is integral with a frustoconical shaped section 23. The frustoconical shaped section 23 has its smallest diameter end integral with the cylindrical portion 22. Integral with the other end of the cylindrical portion 22 is an outwardly extending shoulder 24. The inner wall 25 of the outwardly extending shoulder tapers inwardly. A plurality of circumferentially spaced nozzles 26 are disposed in the cylindrical portion 22 of the main body of the first venturi D for allowing passage of petrol into the first venturi. A divider ring 27 extends outwardly from the cylindrical portion 22, and provides a seal with the inner wall of the second venturi. A groove is defined between the divider ring 27 and the shoulder 24, so that the petrol can pass therethrough into the nozzles 26.
The second venturi has an inner diameter slightly larger than the outer diameter of the first venturi D and is complementary in shape therewith. The second venturi E has a cylindrical portion 28 which is uniform in diameter and is in a pressure fitting relationship with the shoulder 24 and divider ring 27 carried on the first venturi D. Integral with the lower end of the cylindrical portion 28 is a frustoconical shaped member 29, which terminates above the end of the frustoconical shaped member 23 forming a part of the main body of the first venturi. A cylindrical hole 30 is provided in the cylindrical portion 28 of the second venturi E for allowing the petrol flowing through the passageway 20 to enter into the groove so as to pass through the nozzles 26, as well as into the passageway F extending between the main body of the first venturi D and the main body of the second venturi E.
As the gasoline passes through the nozzles 26 into the first venturi it comes in contact with air flowing through the carburetor into an inlet end 31a of the first venturi. This causes the gasoline to vaporize. Such action cools the wall of the first venturi D causing the gasoline flowing through the passageway F between the first and second venturi D and E, respectively, to be cooled. This produces a temperature differential which aids in the vaporization.
An insulating cover 31 encompasses the second venturi E and has an inner diameter slightly larger than the outer diameter of the second venturi E so as to define an air gap 32 between the second venturi and the insulating member 31. The insulating member 31 has a cylindrical portion 33 of a uniform diameter and a frustoconical shaped portion 34, which tapers outwardly from the cylindrical portion 33. A plurality of passageways 35 extend through the cylindrical portion 33 of the insulating member 31 and the cylindrical portion 28 of the second venturi for allowing air to flow into the passageway F. Such enables the gasoline flowing into the passageway F through the passageway 20 to vaporize while in the passageway. As the mixture reaches the end of the passageway F such engages fresh air flowing through the throat of the carburetor and vaporizes further. The reason that the length of the main body of the second venturi is less than the length of the main body of the first venturi is to allow the mixture flowing out of the passageway F to strike fresh air as it exits therefrom.
The passageway 35 is defined by holes 36 carried in the insulating member 31 in alignment with holes 37 carried in the second venturi E.
It is noted that the tubular member 21 terminates in a cylindrical ring shaped member 38 into which the first and second venturies are press fit. The insulating member 31 is press fit onto the second venturi E. The first and second venturi and the insulating member 31 may be constructed of any suitable material, and in one particular embodiment is constructed of brass. The main criteria is to use a material of high heat conduction properties so that as the gasoline flows through the passageway F over the main body of the first venturi, such cools the gasoline. This, in turn, increases the temperature differential between the gasoline and the air flowing through the carburetor aiding in the vaporization of the gasoline. As the efficiency of the vaporization of the gasoline increases such increases the efficiency of the burning of the mixture within the engine upon which the carburetor is utilized. This, in turn, minimizes the pollution generated by the engine during its operation, and when installed on an automobile increases the mileage per gallon of fuel.
While a second venturi E has been utilized to define the passageway F, it is to be understood that the passageway can be defined by other suitable means for encompassing the first venturi D as long as the fuel flowing through the passageway is in heat transfer relationship with the wall of said first venturi D.
While a preferred embodiment of the invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.