By Lawrence O Roth; Harry L Field
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Additional resources for An introduction to agricultural engineering : a problem-solving approach
Burning occurs. and pressure builds rapidly in the cylinder. This is called the ignition and power event. As soon as the piston moves away from the head far enough to expose the exhaust port. the cycle begins again. If you count the movements of the piston. you will find that it has traveled two strokes for one revolution of the crankshaft. Because both the exhaust and the intake processes are not as effiCient as in the 4 cycle engine. the 2 cycle engine will produce less power per stroke. However.
Domestic animals. wind. flowing water. electricity. and heat engines. In relatively recent times. the source of power for agricultural production has shifted from humans to animals. to external combustion heat engines (steam engines). to internal combustion heat engines (gasoline and diesel). Some day the primary source of power may change to fuel cells. solar energy. or atomic energy. but in the immediate future the primary sources of power for agriculture will continue to be internal combustion heat engines and electric motors.
Intake 2. Compression 3. Power 4. 2. Four-stroke cycle. 2 and the following description of the events. An engine can be studied at any point in the cycle. but traditionally we start with the intake stroke. During the intake stroke, the intake valve opens. and the piston travels from the top of the cylinder (TDC) to the bottom (BDC). In both the spark and the compression ignition engines. the movement of the piston reduces the pressure inside the cylinder. causing air to flow through the intake system and into the cylinder.
An introduction to agricultural engineering : a problem-solving approach by Lawrence O Roth; Harry L Field