![]() The metering needle is a variable and is machined to very close limits to provide a mixture ratio for all speeds and loads in line with engine requirements as determined by exhaustive tests on bench and road by carburetter specialists working in collaboration with the engine manufacturers. Manamkothi paravai movie download hd tamilīy this means air velocity and pressure drop across the jet orifice remain approximately constant ensuring good fuel atomisation at all speeds. Turning the orifice adjusting screw, when looking on this c l o ckwise decreases the mixture strength anti-clockwise will enrich. On certain twin carburetter installations, the starting device is fitted to one unit only, and connected to the other by means of a plastic tube, providing a suitable mixture via a duplicated set of holes drilled in the starter disc 30.ĬD carburettor, and the fuel is provided by the jet orifice 19, the amount being controlled by the setting of the orifice adjusting screw 13 and the speed of idle by adjustment to the throttle stop screw 3 which limits the closure of the throttle when the foot is off the accelerator pedal. Simultaneously, the cam on the starter lever will open the throttle beyond the normal idle position, according to the setting of the fast-idle stop screw 4, to provide the fast-idle speed when the motor is cold. In the full rich position the largest hole will be in communication with the starter circuit and provide the richest mixture. While the choke remains in action the car may be driven away but the control knob should be released or pushed in gradually as the engine attains normal working temperature. When the motor fires the increased depression will lift the air valve 18 to weaken the initial starting mixture and prevent the engine stalling through over richness. Simultaneously, the cam on the lever 6 will open the throttle beyond the normal idle position according to the setting of the fast-idle stop screw 4 to provide the fast-idle speed when the motor is cold. ![]() In this manner the enriched mixture necessary to ensure cold starting is provided. ![]() In this manner, the correct level is automatically maintained the whole of the time the carburetter is in action. As the petrol level rises the float lifts and, by means of the float arm and tag, closes the needle on its seating when the correct level has been attained. ![]()
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