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Home > Ordnance Documents and other related manuals > > Action in the Cylinder
Figure 3. Piston and Crankshaft - OD16190009
Figure 5. Intake And Exhaust Ports And Valves

Principles of Internal Combustion Engines
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PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 1/TASK 1
FIGURE 4. PISTON TO CRANKSHAFT RELATIONSHIP.
exhaust valves. A simplified arrangement is shown in figure 6 on the following
page.
The intake and the exhaust valves are opened and closed in a timed sequence by the
valve train. The valve train will be discussed in paragraph 2a(5) on page 8.
(4) Action in the Cylinder. When the piston is at its highest point in the
cylinder, it is in a position called top dead center. When the piston is at its
lowest point in the cylinder, it is in a position called bottom dead center. As
the piston moves from top dead center to bottom dead center, or vice versa, the
crankshaft rotates exactly one­half of a revolution, as shown in figure 6 on the
following page.
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