- When air is forced to flow through a tube as in Fig. There is pressure drop in the the tube as air flows (nozzle)
- This pressure drop is countered by suction of water from the reservoir
The working of carburetor is similar to this above mechanism
- Air flows through the carburetor is due to suction of engine
- And all other principles are same as above mechanism
Controlling the engine
- The amount of power produced by a engine can be controlled by altering the amount of Air + Fuel mixture present in the cylinder .
- The amount of fuel supplied to the engine is indirectly controlled by air velocity (mass flow rate)
- The amount of Air flowing is again controlled by a throttle valve or a butterfly valve . This valve is controlled by accelerator pedal .
- People actually say it as Gas Pedal ,But it just controls amount of Air entering the engine
- A carburetor consists of various jets or holes to achieve different operation condition. Under heavy loads there will a secondary jet adding more fuel into the venturi.
Cons of carburetor
-The problem is that the carburetor cannot react quickly to a driving conditions. As the amount of fuel supplied is controlled indirectly by creating vaccum ( this is not applicable to Diesel engines ,as they dont produce vaccum as they dont have throttle valves)
-Most time only air will rush inside the cylinder without carrying away the fuel with it.
-Stratification is not possible and multi jets are not possible
-Engines cant be turbocharged or super charged (complex but possible and inefficient)