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Fuel injection |
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In an internal combustion engine, the fuel injection
system is that which delivers fuel or a fuel-air mixture to the cylinders by
means of pressure from a pump. It was originally used in diesel engines because
of diesel fuel's greater viscosity and the need to overcome the high pressure
of the compressed air in the cylinders. A diesel fuel injector sprays an
intermittent, timed, metered quantity of fuel into a cylinder, distributing the
fuel throughout the air within. Fuel injection is also now used in gasoline
engines in place of a carburetor. In gasoline engines the fuel is first mixed
with air, and the resulting mixture is delivered to the cylinder. Computers are
used in modern fuel injection systems to regulate the process. The positive
effects of fuel injection are that there is more efficient fuel combustion,
better fuel economy and engine performance and reduced polluting exhaust
emissions. |
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Carburetor |
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This is a device in a gasoline engine. It vaporizes the gas and mixes it with a
regulated amount of air that aids in efficient combustion in the engine
cylinders. Land vehicles, boats, and light aircraft have a float carburetor, in
which a float regulates the fuel level in a reservoir from which the fuel is
continuously sucked into the intake manifold at a restriction called a venturi.
The carburetor has been replaced by the fuel injection system in many modern
vehicles. |
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