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simple carburetor working animation video download
#1

Fuel plus air equals motion that's the basic science behind most of the vehicles that travel on land, over sea, or through the sky. Cars, trucks, and buses turn fuel into power by mixing it with air and burning it in metal cylinders inside their engines. Exactly how much fuel and air an engine needs varies from moment to moment, depending on how long it's been running, how fast you're going, and a variety of other factors. Modern engines use an electronically controlled system called fuel injection to regulate the fuel-air mixture so it's exactly right from the minute you turn the key to the time you switch the engine off again when you reach your destination. But until these clever gadgets were invented, virtually all engines relied on ingenious air-fuel mixing devices called carburetors (spelled "carburettor" in some countries and often shortened to just "carb"). What are they and how do they work? Let's take a closer look!

How engines burn fuel

Flame, wick, and melted wax on top of a candle

Engines are mechanical things, but they're chemical things too: they're designed around a chemical reaction called combustion: when you burn fuel in air, you release heat energy and produce carbon dioxide and water as waste products. To burn fuel efficiently, you have to use plenty of air. That applies just as much to a car engine as to a candle, an outdoor campfire, or a coal or wood fire in someone's home.

Photo: A candle mixes wax fuel with air from its surroundings. With too little air, the flame goes out; with too much, the flame will roar and burn blue. A car engine burns fuel in a similar way. Getting its air supply just right is more tricky and more critical.

With a campfire, you never really have to worry about having too much or too little air. With fires burning indoors, air is in shorter supply and far more important. Having too little oxygen will cause an indoor fire (or even a fuel-burning device like a gas central-heating furnace (boiler)) to produce dangerous air pollution, including toxic carbon monoxide gas. With a car engine, having too much air is just as bad as having too little. Too much air and not enough fuel means an engine burns "lean," while having too much fuel and not enough air is called burning "rich"; both are bad for the engine in different ways.
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#2
Abstract

A carburetor (American and Canadian spelling), carburator, carburettor, or carburetter (Commonwealth spelling) is a device that blends air and fuel for an internal combustion engine. It is sometimes colloquially shortened to carb in North America or carby in Australia. To carburate or carburet (and thus carburation or carburetion, respectively) is to blend the air and fuel or to equip (an engine) with a carburetor for that purpose.Carburetors have largely been supplanted in the automotive and, to a lesser extent, aviation industries by fuel injection. They are still common on small engines for lawn mowers, rototillers, and other equipment.
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