introduction to carburetor
- 1. A SEMINAR REPORT ON INTRODUCTION TO CARBURETOR
- 2. CARBURETOR A carburetor or carburettor is a device that mixes air and fuel for internal combustion engines in the proper ratio for combustion
- 3. THE MAIN COMPONENTS OF A CARBURETOR • 1. Starting lever; • 2. Air intake; • 3. Venturi; • 4. Starter jet; • 5. Float chamber; • 6. Atomizer; • 7. Fuel valve; • 8. Needle; • 9. Throttle valve;
- 4. THE MAIN COMPONENTS OF A CARBURETOR • 10. Float chamber air intake; • 11. Fuel connection; • 12. Idle mixture adjusting screw; • 13. Throttle valve adjusting screw; • 14. Float; • 15. Idle emulsion tube, • 16.Idle jet; • 17. Main jet.
- 5. BLOCK DIAGRAM OF CARBURETOR
- 6. FUNCTION OF CARBURETOR Functions of it include, A. Setting the ratio of air and fuel mixture. B. Making the mixture into the mist. C. Increase or decrease the amount of the mixture according to engine speed and load changing
- 7. BASIC FORMS OF CARBURETORS There are three general types of carburetors depending on the direction of flow of air. 1. UP DRAUGHT CARBURETOR 2. DOWNDRAUGHT CARBURETOR 3. HORIZONTAL CARBURETOR
- 8. UP DRAUGHT CARBURETOR The up draught type shown in figure in which the air enters at the bottom and leaves at the top so that the direction of its flow is upwards. The disadvantage of the up draught carburetor is that it must lift the sprayed fuel droplet by air friction.
- 9. DOWNDRAUGHT CARBURETOR It is placed at a level higher than the inlet manifold and in which the air and mixture generally follow a downward course. Here the fuel does not have to be lifted by air friction as in the up draught carburetors but move into the cylinders by gravity even if the air velocity is low.
- 10. HORIZONTAL CARBURETOR A cross-draught or horizontal carburetor consists of a horizontal mixing tube with a float chamber on one side of it figure. By using across-draught carburetor in engines, one right-angled turn in the inlet passage is eliminated and the resistance to flow is reduced.
- 11. CONSTANT CHOKE CARBURETOR • Air and fuel flow area are always maintained constant. • But the depression or difference which causes the flow of fuel and air to be maintained as per demand. • The solex and Zenith carburetors belong to these class.
- 12. CONSTANT VACUUM CARBURETOR • Its called variable choke carburetor. • Air and fuel flow areas are varied as per demand, vacuum is constant always same. • The S.U and Carter carburetors belong to this class.
- 13. MULTIPLE VENTURE CARBURETOR • The boost venture is located concentrically within the main venture. • The discharge edge of the boost venture is located at the throat of the main venture. • Only fraction of air passes through boost venture. • This result following: • High depression is created at the region of nozzle. • At boost venture throat velocity of air is as high as 200 m/s • Excellent low speed full throttle operation is possible. • More efficient mixing of the air and fuel is obtained without incurring an avveptable reduction in volumetric efficiency.
- 14. MULTIJET CARBURETORS • A single barrel carburetor has only one barrel, whereas a dual carburetor has two barrels. • Each of these two barrels has different fuel jet, choke, throttle, idling system etc. • Passenger cars with six or more cylinders are provided with dual carburetors. • Each venture supplies the air-fuel mixture to half of cylinders.
- 15. DIFFERENT MODERN CARBURETORS There are mainly two type of carburetors. • Open choke • Vacuum type. S.V carburetor are constant venture type. Zenith, solex, carter and Stromberg carburetors are constant venture type.
- 16. TYPES OF DIFFERENT MODERN CARBURETORS • Zenith Carburetor • Solex Carburetor • Carter Carburetor
- 17. ZENITH CARBURETOR • This is the oldest type of carburetor. • It was used in all automobile engines before 25 years. • It consist of all components which basic carburetor have. A. Starting jet B. Main Jet C. Compensating Jet D. Float chamber E. Choke and throttle valve.
- 18. SOLEX CARBURETOR • This is most common type of carburetor used in Fiat and Standard cars. • It is famous for good and easy starting • Performance and reliability. • Its also runs on starting jet for starting purpose. • In addition it contains starting jet, compensating jet and accelerating jet.
- 19. CARTER CARBURETOR • It was founded by William Carter. • Carter Carburetor Company in was established in 1909, and ceased operation in 1985. • A carter carburetor is an American make carburettor and is used in jeeps. It is a standard equipment on chevorolet and Pontiac series of cars.
- 20. ADVANTAGES OF CARBURETOR • Carburetor parts are not expensive as that of fuel injectors, especially EFI, which would give you large savings. • With the use of carburetor you get more air and fuel mixture. • In terms of road test, carburetors have more power and precision. • Carburetors are not restricted by the amount of gas pumped from the fuel tank which means that cylinders may pull more fuel through the carburetor that would lead to denser mixture in the chamber and greater power as well.
- 21. DISADVANTAGES OF CARBURETOR • At a very low speed, the mixture supplied by a carburetor is so weak that it will not ignite properly and for its enrichment, at such conditions some arrangement in the carburetor is required. • The working of carburetor is affected by changes of atmospheric pressure. • It gives the proper mixture at only one engine speed and load, therefore, suitable only for engines running at constant speed increase or decrease. • More fuels are consumed since carburetors are heavier than fuel injectors. • More air emissions than fuel injectors. • Maintenance costs of carburetor is higher than with fuel injection system