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Outs. Mixture Prep.
Mixture Preparation
Air Filter
History Injection
Petrol Injection
Single Point Injection
Multi Point Injection
Intake Mixt. Heating
Elektr. Eng. Managem.
Exhaust Gas Treatm.
On Board Diagnosis
Adjust. Intake Manif. 1
Adjust. Intake Manif. 2
Intake Air System
Cylinder deactivation 1
Cylinder deactivation 2
Cylinder deactivation 3
Induct. Pulse Gener.
Lambda Sensor
Lambda s. voltage meas.
Lambda sensor Diesel
Thermo Time Switch
Side channel pump
Peripheral pump
Diaphragm pump
Roller Vane Pump
Oil-bath Air Filter
Unreg. Intake Air

Fuel 1
Fuel 2
Fuel 3
Fuel 4
Fuel 5
Fuel 6
Fuel 7
Fuel 8
Fuel 9
Fuel 10
Fuel 11
Fuel 12

Oilbath - Air Filter

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Nowadays they probably are only found in certain utility vehicles, earlier, the oil-bath air filters were also widely used in motor cars. The above example is from the VW-Beetle, and had to be cleaned every 2500 km and be supplied with fresh oil. The filter was laid onto a wire mesh, and thus, drew off the dust from the inflowing air.

An interesting point in this example is, next to the the normal intake duct on the left, is a second duct underneath it, for the pre-heated air. In this case the flap was thermo-statically controlled to take in cold air when the engine was warm, and warm air when the engine was cold. Since on cold inlet manifold- and cylinder walls, as little petrol as possible should be allowed to settle. With a warm engine however, a good filling, through the cold air, was required. Other examples were not as flexible. Either the driver had to position the flap for summer or winter operation, or, through a weight on the flap, only a certain, basic amount of warm air was taken in. 10/09

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