![]() Mounted near the fuel tank pumps fuel at a pressure of 100psi up to a fuel One type fitted to many British cars, including the Triumph TR6 PI and 2500 PI, was the Lucas PI system, which is a timed system. Was used in the 1960s and 1970s by many manufacturers on their higher-performance sports cars and sports saloons. ![]() This is thanks to the increasing reliability and decreasing costs of electronic control systems. Mechanical systems have now been largely superseded by These systems suffer from the drawbacks of being mechanically complex and having poor response to backing off the throttle. They are often called petrol injection (PI for short) and the fuel flow is controlled by a mechanical regulator assembly. ![]() The earliest systems were mechanically controlled. As with continuous injection, timed injection can also be controlled either mechanically or electronically. Where the fuel is delivered in bursts to coincide with the The amount of fuel sprayed is increased or decreased by a mechanical or electrical control unit - in other words, it is just like turning a tap on and off. The injector simply acts as a spray nozzle to break up the fuel into a fine spray - it doesn't actually control the fuel flow. Where the fuel is squirted into the inlet port all the time the engine is running. The injectors are one of two types, depending on the injection system. The injectors through which the fuel is sprayed are screwed, nozzle-first, into either the inlet manifold or the cylinder head and are angled so that the spray of fuel is fired towards the inlet
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