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Having far too much air is just as bad as having far too "lean," while having too much fuel and not enough air is calledīurning "rich." Having slightly too much air (a slightly lean mixture) will give better fuel economy, while having slightly too little (a slightly rich mixture) will give better performance. Too much air and not enough fuel means an engine burns The ratio is usually around 14.7 parts of air to 1 part of fuel (though itĭoes vary depending on exactly what the fuel is made up of). The chemist's equivalent of making sure you have just enough of each ingredientīefore you set about cooking from a recipe.) In the case of a car engine, Just enough atoms of oxygen to burn all your atoms of fuel, that's calledĪ stoichiometric mixture. With a car engine, it's a bit more complex. This is called a stoichiometric mixture and it works out as 94 percent air and 6 percent fuel. But you'll still find carburetors on older car and motorcycle engines, and in the compact engines in lawnmowers and chainsaws.Īrtwork: In theory, a car engine needs 14.7 times more air than fuel if the air-fuel mixture is to burn properly. Modern car cylinders are fed more efficiently by fuel-injection systems, which use less fuel and make less pollution. What are they and how do they work? Let's take a closer look!Īrtwork: Carburetors in a nutshell: they add fuel (red) to air (blue) to make a mixture that's just right for burning in the cylinders. "carburettor" in some countries and often shortened to just "carb"). Ingenious air-fuel mixing devices called carburetors (spelled But until theseĬlever gadgets were invented, virtually all engines relied on The engine off again when you reach your destination. Modern engines use an electronically controlled systemĬalled fuel injection to regulate the fuel-air mixture so it'sĮxactly right from the minute you turn the key to the time you switch It's been running, how fast you're going, and a variety of otherįactors. Exactly how much fuel and airĪn engine needs varies from moment to moment, depending on how long
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Cars, trucks, andīuses turn fuel into power by mixing it with air and burning it in That travel on land, over sea, or through the sky.
Carburator diagrams plus#
Last updated: August 22, 2022.įuel plus air equals motion-that's the basic science behind most of the vehicles