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Technician A is correct. The crankshaft must revolve two times to complete one cycle, which as 4 strokes. One half revolution for each stroke. Intake, compression, combustion, exhaust = four strokes to complete a cycle. One half revolution for each stroke of the piston going up or down. Look at a diagram and you'll see this is pretty simple.
The crankshaft makes two complete revolutions to complete one thermodynamic cycle. The crankshaft rotates 180 degrees during each stroke of the engine. Hence a total of two revolutions occur after completion of the four strokes. Chechout "www.howstuffworks.com " to see how crankshaft works.
2 revolutions
one rotation
it varies a lot
1st stroke, intake. 2nd stroke, compression. 3rd stroke, power. 4th stroke, exhaust. The 4 stroke cycle take 2 full revolutions of the crankshaft.
720 degrees
720 degrees
1st stroke, intake. 2nd stroke, compression. 3rd stroke, power. 4th stroke, exhaust. The 4 stroke cycle take 2 full revolutions of the crankshaft.
Using directions like upwards in this context is meaningless because you haven't defined how the piston is oriented.During the compression stroke of a typical 4-stroke gasoline engine, the piston takes energy from the crankshaft. The reason the whole scheme still works is that you get a lot more energy back after the combustion during the power stroke. Add up the total energy moved between the piston and the crankshaft over a whole cycle (two rotations of the crankshaft), and you will find the total being positive from piston to crankshaft.
Number 1, the intake stroke. Weather it is fuel injected or has a carburetor makes no difference. Most internal combustion engines today are 4 stroke engines. The four strokes refer to intake, compression, combustion and exhaust strokes that occur during two crankshaft rotations per working cycle of Otto Cycle and Diesel engines. The four steps in this cycle are often informally referred to as "suck, squeeze (or squash), bang, blow." Intake stroke
Two complete revolutions, therefore 720 degrees.