Brake Mean Effective Pressure (Bmep) SI Engine

AI Thread Summary
Using maximum torque instead of maximum power in the brake mean effective pressure (BMEP) equation is not appropriate, as the equation is designed specifically for brake power. There is a fundamental relationship between torque, engine RPM, and power output that must be considered. Calculations showing that BMEP at maximum brake power is significantly higher than at maximum torque are consistent with the underlying physics of engine performance. Understanding these relationships is crucial for accurate BMEP calculations. A solid grasp of engine fundamentals is essential for proper application of the BMEP equation.
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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

 
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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.
 
Yes I have found that equation as well, thank you. Need stronger knowledge of basics as always
 

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