Diesel Turbocharger (two-stroke
    engine)

Function

The two-stroke diesel direct fuel injection engines has better chances as vehicle engine than the two-stroke petrol-intake manifold injection engine because the flushing can be more effective. There is no danger to dismiss unused air-fuel mixture out of the exhaust system into the environment. Moreover, no engine oil reaches the exhaust gas.

How it works

Against the customary opinion this engine features valves and the oil sump of a four-stroke engine. Nevertheless, the engine manages the strokes compress/operate and expel/suck in within one crankshaft rotation. It needs exhaust valves and the charging, in this case the exhaust-turbocharger. If the piston on its way down opens the inlet ports, becomes the old gas is blown out under high pressure by the fresh air. If now the exhaust valves close a little earlier as the inlet ports at the piston, the compression can already develop, providing enough pressure for the combustion with the piston on its way to TDC. Instead of the mixture lubrication of the motorcycle two-stroke this engine has a pressure circulation lubrication.

Application

This combustion principle is typical for large engines (e.g., ship diesels) with single cubic capacities up to approx. 1 m ³. The cylinder number of the in-line engines is because of the low revs of far less than 1000 1/ min variable. At the moment smaller ship engines have up to 12 cylinders, 14 (!) would be possible. Having efficiencies of up to 52% the performance has recently crossed the 100.000-HP border. The advantage is the maximisation of loading capacity by putting a lot of performance / torque on a relatively small space.You may assume, with such a large engine a vehicle engine would be used as a starter. But, in reality enough energy is held ready with 30 bar pressure in several containers (starting air bottles) for max. approx. 15-times starting. This is also necessary, because a gearbox and with it also the reverse gear is absent. The power is directly put onto the ship's propeller. Backing off is possible by shutting off the engine and renewed starting in reverse rotation direction. 05/08