There’s not much inside a turbocharger two rotors fixed on the same shaft, each in a sealed housing. One rotor is a turbine, which is spun round at high speed by exhaust gas coming out of the engine. the rotor on the opposite end of the shaft is an air compressor, driven by the spinning turbine.
Air drawn into the compressor from the air fitter, is pressurized, and sent to the engine intake manifold. Exhaust coming out of the turbine rejoins the exhaust pipe. The system can increase engine performance by 30 per cent, and it’s relatively fuel efficient because it’s powered by waste exhaust gas. It’s simple in principle, but elaborate sealing and bearing system make the turbocharger a complex piece of engineering, as we’ll see later.
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