Oil Pump: Description and Operation

Demand-Controlled Oil Pump







In order to reduce the drive losses of auxiliary units as well as churning loss, the new 911 Turbo is fitted with an electronic demand-controlled oil pump, analogously to the current 911 Carrera models. This increases the engine's efficiency, consequently reducing fuel consumption.

With this oil pump, the delivery pressure and volume are controlled for the entire engine map. In other words, the required oil pressure is set for all engine speeds and engine loads (accelerator pedal position). Accordingly, the oil pressure shown in the instrument cluster varies based on the engine speed and load. The oil pressure setting results in a defined oil volume flow based on the defined leaks (e.g. bearing clearance of connecting rod and crankshaft bearings). The oil pump is integrated compactly in the oil pan area and is driven directly by the crankshaft via a chain.







Demand-based control of the oil pump is provided by the engine management. The input variables are engine speed, oil pressure, oil temperature and engine torque. On the basis of this information, axial movement of a gear wheel controls the engaged gear wheel width and changes the geometric displacement volume. This in turn varies the oil pressure. The demand-based control of the oil pump for the new 911 Turbo has been modified on the basis of the 911 Carrera models and the control map adapted to the higher bearing loads.

The demand-controlled pump also ensures that only the quantity of oil necessary for the respective load range of the engine is provided. This minimizes the energy consumption of the oil pump and ensures demand-based lubrication.