For decades a car’s engine was fed fuel through a carburettor. This is a mechanical device that measured fuel through a system of small pipes and the fuel was sucked into an engine cylinder’s combustion chamber via the downward motion of the cylinder’s piston.
The process is colloquially known as “suck squeeze bang blow”, for drawing in the fuel, compressing the fuel on the upward run of the piston, the spark plug igniting the fuel, and pushing the remnants out through the exhaust.
Fuel injection is a more precise method of feeding the fuel into a cylinder and aids in consumption, less engine issues found in “carbie” engines, and helps reduce emissions. The most common method of fuel injection today is direct injection. Previous EFI systems would use a pump to push the fuel into the fuel delivery pipe, which would then feed into a single pipe, in the case of four or six cylinder engines, which would in turn feed the fuel into individual pipes that would lead into the cylinders.
Now we see individual runners injecting directly into the individual cylinders. Evolution has refined the injection nozzles themselves. A finer mist of fuel means a more efficient combustion which maximizes fuel efficiency aka fuel consumption. Because the fuel is burned more efficiently, there are less emissions to exit the cylinder and vent to the atmosphere. Modern electronics also mean that the fuel delivery is tailored to demand more efficiently, rather than a constant feed irrespective of engine needs.
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