Four-Stroke Cycle Diesel Engine

follows: intake, compression, power, and exhaust. A cycle occurs during two revolutions of the crankshaft. INTAKE STROKE.  — The intake stroke begins at top dead center, and as the piston moves down, the intake valve opens. The downward movement of the piston creates a vacuum in the cylinder, causing a fuel and air mixture to be drawn through the intake port into the combustion chamber. As the piston reaches bottom dead center, the intake valve closes. COMPRESSION STROKE.— The compression stroke begins with the piston at bottom dead center and rising up to compress the fuel and air mixture. Since both the intake and exhaust valves are closed, there is no escape for the fuel and air mixture, and it is compressed to a fraction of its original volume. At this point, the fuel and air mixture is ignited. POWER  STROKE.—  The power stroke begins when the fuel and air mixture is ignited, burns and expands  and  forces  the  piston  down.  The  valves  remain power  stroke  ends  as  the  piston  reaches  bottom  dead center. EXHAUST   STROKE.—   The  exhaust  stroke begins when the piston nears the end of the power stroke and the exhaust valve is opened. As the piston moves upward  towards  top  dead  center,  it  pushes  the  burnt gases, resulting from the ignition of the fuel and air mixture, out of the combustion chamber and through the exhaust port. As the piston reaches top dead center, ending the exhaust stroke, the exhaust valve closes, and the intake valve opens to begin the intake stroke for the next cycle. Four-Stroke Cycle Diesel Engine The four-stroke diesel engine is similar to the four- stroke  gasoline  engine.  They  both  follow  an  operating cycle that consist of intake, compression, power, and exhaust strokes. They also share similar systems for intake and exhaust valves. The components of a diesel closed so that all the force is exerted on the piston. The engine are shown in figure 1-6. Figure 1-6.—Four-stroke cycle diesel engine. 1 - 4


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