Lubrication 13 - Variabel Oil Pump
The less important change: vehicles with a display as standard have no dipstick. The oil level is measured by an ultrasonic transducer. The workshop can control its work with a 'special
tool', a universal measuring rod possible to use for all models.
Above you can view a variable oil pump in two stages switching over from just below 2 bar to about 3 bar at medium engine speed depending on additional parameters. If the controlling fails
completely, a spring secures setting the highest pressure automatically. By the way, it may be that the pump doesn't switch back to low pressure during the first 1000 km, even at idle
speed. That is part of the rules during the break-in period.
The pressure is reduced because of CO2-saving. 4 percent estimated by some specialists are slightly generous. In the case of reducing an electromagnetic valve deflects oil
pressure against the spring, whereby the housing of the impeller is twisted and moved so that the delivery rate and thus the pressure drops.
Of course, a certain oil pressure is needed, possibly for removing heat, but certainly for its involvement in certain control processes as for adjusting the camshaft. May be 2 bar are
necessary for this. In earlier times the oil pressure was between less than 1 and more than 3 bar.
Did you know that such a pump accomplishes an enormous capacity, well over one cubic meter per hour, with each kW motor power proportional
increasingly in also smallest engines. Meanwhile, there exist even electrically driven, for example, to supply the bearing of a turbo charger after sudden engine
shut-off. 08/16
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