High-Pressure Pump

High-Pressure Pump

This provides the high pressure of between 4 approx. 580 and 1740 psi (40 and 120 bar) needed for injection. The pump is driven via the intake camshaft of the left cylinder bank.







- Naturally aspirated engine - 3-piston high-pressure pump (HD) with quantity control valve and 1 damper.
- Turbo engine - 6-pistion high-pressure pump (HD) with quantity control valve (1) and 2 dampers (2).

Quantity Control Valve

The quantity control valve installed at the inlet port of the high-pressure pump regulates the fuel high pressure.

High-Pressure Rail







The central high-pressure rail (KR) is located in the inner-V of the engine, from where the fuel is supplied to the injectors via individual lines. The volume of the high-pressure rail differs for the naturally aspirated and turbo engines. The high-pressure rail provides the same pressure for all injectors.

Pressure Sensor

The pressure sensor (DS) on the high-pressure rail measures the fuel high pressure at approx. 580 and 1740 psi (40 and 120 bar).

Fuel Injectors

The injectors (EV) are solenoid-operated and are positioned beneath the intake ducts of each cylinder. They inject the fuel under high pressure directly into the combustion chamber. To open an injector, the activation voltage is briefly raised to up to 75 V by means of a voltage booster in the DME control unit.

The V8 naturally aspirated engine injection quantity is 210 g/min and V8 Turbo engine injection quantity is 349 g/min.