Ignition

                        with the ignition                            self ignition
             (Interest on the spark plug fires)    (due to high temperatures)

1. Gasoline and air are mixed                       1. Only the air that is
    in the carburettor / inlet                                 inhaled by the engine
2. The mixture is inserted                             2. Compressed air at high pressure
    into the cylinder                                           so that the temperature and high 
3. Spark plugs and sprinkled                        3. The fuel is sprayed into the 
    on the mixture will burn                               cylinder finely and evaporated.
                                                                  4. Fuel burn by itself