WHAT IS CARBURETOR ? HOW IT IS USED ?

 The Carburetor is a device used for atomizing and vaporizing the fuel and mixing it with the air in  varying proportions to suit the changing operating conditions of vehicle engines. The process of  breaking up and mixing the fuel with the air is called carburetion.

 The term vaporization and atomization should be understood clearly. Vaporization is a change of state of   fuel from a liquid to a vapor, whereas atomization is a mechanical breaking-up of the liquid into small   particles so that every minute particle of the fuel is surrounded by the air. The Carburetor is supposed to supply fuel air mixture in correct proportion under different conditions of temperature, speed and load on   engine.

Relatively rich mixture of  air fuel ratio 12 : 1 is required by the engine while accelerating or running at higher speeds. A lean mixture of air-fuel ratio 16 :1 is sufficient while running on the level roads. For idling, a somewhat richer mixture of about 14:1 is needed. Similarly, an extremely rich mixture having a ratio of 9:1 is required during cold starting.