1. Fuel Induction Systems for S.I. Engines
P M V Subbarao
Professor
Mechanical Engineering Department
Right and Metered amount of Fuel per cycle…...

2. The Role of Fuel Induction System : S.I. Engine
The tasks of the fuel induction systems are;
to introduce right amount of specified schedule.
This schedule must be in agreement with allowable Heat Release Rate and duration of combustion.
to prepare a mixture that satisfies the requirement of the engine using ambient air and fuel.
This preparation is to be carried out over entire engine operating regime.
In principle, the optimum air-fuel ratio for an engine is that which give the required power output with the lowest fuel consumption.
It should also ensure smooth and reliable operation.

3. Types of Fuel Induction Systems : SI Engines
The fuel Induction systems used in SI engine are classified as:
Carburetors.
Throttle body Fuel Injection Systems.
Multi Point Fuel Injection Systems.
Direct Gasoline Injection System

4. Evolution of Fuel Inductions Systems : SI Engines – First Generation

5. Evolution of Fuel Inductions Systems : SI Engines – Second Generation

6. Evolution of Fuel Inductions Systems : Third Generation

7. Evolution of Fuel Inductions Systems : Next Generation

8. Carbureted S.I. Engines
There are some very obscure auto makers, primarily in Africa and Russia, who still build cars with carburetors.
These cars are typically designs that have been purchased from their original manufacturers and remade for a new market.
To keep expenses down, these auto makers avoid computer controls and use mechanical components such as a carburetor on their cars to make them more easily repairable.
Many motorcycles, are one of the last holdouts of the factory production carburetors today.

9. Jul 31, 2006  : New motorbike technology bids goodbye to the carburettor
On June 26, Hero Honda, for the first time in India, launched the fuel injection (FI) technology in two-wheelers under the brand name Glamour FI. 

11. Air-Fuel Supply Systems : Carbureted S.I. Engines

12. Thermo-flow Model for Carburetor1

13. One dimensional Isentropic Flow Through A Venturi

14. Reversible Subsonic Flow Nozzle : Venturi
pthroat
p1 = p2s > pthroat p1 p1
p2s p

15. Real Flow Through A Venturi
pthroat
p2a < p2s p1 p1
p2s p
p2a

16. Practical Carburetor Venturi

17. Actual Air Flow Through Venturi
Where
Fuel Flow Through Orifice

18. Carburetor Performance

19. Carburetor Performance

20. Carburetor Performance

21. Control of Equivalence Ratio using Carburetor

22. Modern Carburetor