78 WHERE DOESFUEL INJECTION ? COME FROM Fuel has to get into an engine to combust, but how does it all actually work? JAKE VENTER explains. F or an engine to run, it needs fuel. For a car to drive faster, it needs more fuel, and you as the driver manage this process by applying more pressure on the accelerator. However, it is not just a case of unlimited quantities of fuel being dumped into the combustion chamber. The process is much more complicated than that. In years past, fuel regulation was by way of a carburettor, which was much more wasteful than the fuel-injection systems used today. The latter controls the quantity of fuel to precise measures for optimal performance and economy. Fuel injection, in one form or another, has existed for more than 100 years, but is only lately being exploited to its full extent. This has become possible because the computer revolution has eliminated the system’s bothersome mechanical fuel-mixture control problems. Diesel engines were the first to use fuel injection – there was no alternative – but petrol engine technology has given the system a new lease of life.
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