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Figure 1-8.-Diesel and gasoline engines intake strokes.
Multifuel  Engine

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injection  system.  The  air  and  fuel  then  mix  in  the combustion  chamber  (fig.  1-8). 4. The engine speed and the power output of a diesel engine are controlled by the quantity of fuel admitted to the combustion chamber. The amount of air is constant. On the gasoline engine, the speed and power output is regulated by limiting the air and fuel mixture entering the engine (fig. 1-9). A  diesel  engine  is  much  more  efficient  than  a gasoline engine, such as the diesel engine does not require an ignition system due to the heat generated by the higher compression, the diesel engine has a better fuel economy due to the complete burning of the fuel, and the diesel engine develops greater torque due to the power  developed  from  the  high-compression  ratio. The strokes that make up the four-stroke cycle of a diesel  engine  follow. DIESEL  ENGINE  INTAKE  STROKE.—  The piston is at top dead center at the beginning of the intake stroke, and, as the piston moves downward, the intake valve opens. The downward movement of the piston draws air into the cylinder, and, as the piston reaches bottom  dead  center,  the  intake  valve  closes  (fig.  1-10, view  A). Figure  1-10.—Four-stroke  cycle  diesel  engine. 1-7







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