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Homework Help: Cycles and revolutions

  1. Dec 13, 2013 #1
    1. The problem statement, all variables and given/known data

    In a diesel engine each cycle takes two revolutions and there are 6 cylinders.

    2. Relevant equations

    what does " each cycle takes two revolutions" mean and are there a relation or equation between
    cylinder number and calculation of engine power?
    3. The attempt at a solution
  2. jcsd
  3. Dec 13, 2013 #2


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    Staff Emeritus
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    Homework Helper

    In the four-stroke diesel cycle, it takes two revolutions of the crankshaft to:
    1. Draw in the air for combustion. (piston goes down)
    2. Compress the air (piston goes up)
    3. Fuel ignites and expands (piston goes down)
    4. Exhaust combusted fuel from the cylinder (piston goes up).

    There is also a two-cycle process, where all of the above can be accomplished during one revolution of the crankshaft.



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