Turbocharger — general information (Opel Omega B)

The OMEGA diesel engine is equipped with a turbocharger. In a turbocharger, both turbine wheels are located on the same shaft, but in independent housings. The turbine wheels are driven by exhaust gases. The wheels rotate the shaft at a speed of up to 120,000 rpm. Since the exhaust and intake rotors are on the same shaft, fresh air is pumped into the cylinders at a constant rotation speed.

Due to the high volumetric efficiency (efficiency), the increase in power in such engines is up to 100%. The increase in power is affected by the boost pressure, which in passenger car engines is in the range from 0.4 to 0.8 bar (tire pressure about 1.8 bar). If the boost pressure exceeds the value set by the manufacturer, then the bypass valve opens and the pressure decreases.

Along with engine power, the presence of a turbocharger also increases torque, which primarily has a beneficial effect on the smoothness of engine operation. Unlike gasoline engines, due to supercharging, diesel engines do not require lowering compression, since even at low speeds the injected fuel is completely exhausted.

The turbocharger is an element that must operate with high precision. Therefore, it is recommended that it be repaired only by a specialist. As a rule, in the event of a turbocharger failure, it is replaced as a set.