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DIFFERENT SYSTEMS OF IC ENGINE PDF LEC- 3

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DIFFERENT SYSTEMS OF IC ENGINE – COOLING, LUBRICATING, FUEL INJECTION SYSTEMS

  • Calorific value of fuel
  • FUEL SUPPLY SYSTEM IN SPARK IGNITION ENGINE
  • Carburetor
  • Functions of carburetor
  • FUEL SUPPLY SYSTEM IN DIESEL ENGINE
  • Fuel tank
  • Air venting of fuel system
  • Fuel injector
  • LUBRICATION SYSTEM
  • Purpose of lubrication
  • Types of lubricants
  • Engine lubrication system
  • Types of lubricating systems
  • IGNITION SYSTEM
  • SPARK IGNITION
  • MAGNETO IGNITION SYSTEM
  • Main components of magneto ignition system
  • COOLING SYSTEM
  • Purpose of cooling
  • Methods of cooling
  • AIR COOLING SYSTEM
  • Advantages of air cooled engine
  • WATER COOLING SYSTEM
  • 1. Open jacket method
  • 2. Thermo siphon method
  • Water pump
  • Thermostat valve
  • Forced Circulation cooling system- Water cooled engine
  • GOVERNOR
  • Types of governors
  • Governor regulation

The fuel supply system of spark ignition engine consists of
1. Fuel tank 2. Sediment bowl
3. Fuel lift pump 4. Carburetor
5. Fuel pipes
In some spark ignition engines the fuel tank is placed above the level of the carburetor.
The fuel flows from fuel tank to the carburetor under the action of gravity. There are one or two filters between fuel tank and carburetor. A transparent sediment bowl is also provided to hold the dust and dirt of the fuel. If the tank is below the level of carburetor, a lift pump is provided in between the tank and the carburetor for forcing fuel from tank to the carburetor of the engine. The fuel comes from fuel tank to sediment bowl and then to the lift pump. From there the fuel goes to the carburetor through suitable pipes. From carburetor the fuel goes to the engine cylinder through inlet manifold of the engine.

Carburetor
The process of preparing air-fuel mixture away from the engine cylinder is called carburetion. and the device in which this process takes is called carburetor.
Functions of carburetor
1. To mix the air and fuel thoroughly
2. To atomize the fuel
3. To regulate the air- fuel ratio at different speeds and loads on the engine.
4. to supply correct amount of mixture at different speeds and loads

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