Two-stroke diesel engine

Figure 7-5.—Two-stroke diesel engine. revolution of the crankshaft, or twice as many as In view C, the piston is moving downward on in  a  four-stroke  cycle  engine. NOTE:  A  two-stroke  engine  does  not  have intake  valves.  It  has  intake  ports  (fig.  7-5). The  steps  in  the  operation  of  a  two-stroke diesel engine are shown in figure 7-5. In view A, the piston is moving upward on the compression stroke. The exhaust valve and the intake ports are closed,  and  the  piston  is  compressing  the  air trapped  in  the  combustion  chamber.  At  the  top of  the  stroke,  with  the  piston  in  the  position shown  in  view  B,  fuel  is  injected  (sprayed)  into the cylinder and ignited by the hot compressed air. the  power  stroke:  The  exhaust  valves  are  still closed;  and  the  increased  pressure,  resulting  from the burning fuel, forces the piston downward and rotates  the  crankshaft. As the piston nears the bottom of the power stroke (view D), the exhaust valves open and the piston continues downward to uncover the intake ports.  Air  is  delivered  under  pressure  by  a  blower for  two-stroke  diesel  engines.  In  a  two-stroke gasoline  engine,  air  comes  from  the  crankcase through the intake ports; and the burned gases are   carried   out   through   the   exhaust   valve. This  operation  (referred  to  as  scavenging  air) takes place almost instantly and corresponds to 7-6


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