What is a Carburetor?

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Carburetor:

The carburetor also spelled carburettor, device for supplying a spark-ignition engine with a mix of fuel and air. Components of carburetors usually include a storage chamber for liquid fuel, a choke, an idling (or slow-running) jet, the most jet, a venturi-shaped air-flow restriction, and an accelerator pump. The number of fuel within the storage chamber is controlled by a valve actuated by afloat. The choke, a valve, reduces the intake of air and allows a fuel-rich charge to be drawn into the cylinders when a chilly engine is started.

As the engine warms up, the choke is gradually opened either by hand or automatically by heat- and engine-speed-responsive controllers. The fuel flows out of the idling jet into the intake air as a result of reduced pressure near the partially closed throttle. The most fuel jet comes into action when the valve is further open. Then the venturi-shaped air-flow restriction creates a reduced pressure for drawing fuel from the most jet into the airstream at a rate associated with the airflow in order that an almost constant fuel-air ratio is obtained. The accelerator pump injects fuel into the inlet air when the throttle is opened suddenly.

In the 1970s, new legislation and consumer preferences led automobile manufacturers to boost fuel efficiency and lower pollutant emissions. To accomplish these objectives, engineers developed fuel injection system management systems that supported new computer technologies. Soon, mechanical system systems replaced carbureted fuel systems in virtually all gasoline engines apart from two-cycle and tiny four-cycle gasoline engines, like those employed in lawnmowers.

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