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Homework Help: Brake Mean Effective Pressure (Bmep) SI Engine

  1. Aug 19, 2013 #1
    Dear all,

    Can Torque max. be used instead of Power max. in the bmep equation?-(as shown on attached pic)

    The name of the equation seems to suggest it is only for Brake Power but hopefully i am wrong.

    Also, when I do a calculation for bmep for max. Brake Power and max. Torque, the bmep at max. Brake Power is about 210 times that for bmep at max. Torque (Shown in attached picture):
    Can this be correct?

    Thanks for reading

    307MED 2011 Q1a i) 001.jpg
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Aug 20, 2013 #2


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    Staff Emeritus
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    Homework Helper

    You can't just blindly plug in torque in place of power in the equation for BMEP.

    Remember, there is a relationship between torque, engine RPM and power output.
  4. Aug 21, 2013 #3
    Yes I have found that equation as well, thank you. Need stronger knowledge of basics as always
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