Mechanical efficiency of IC engine

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The mechanical efficiency of an internal combustion engine is calculated using the formula n = (Pb / Pig) = 1 - (Pf / Pig), where Pb is brake power, Pig is gross indicated power, and Pf is friction power. The discussion also touches on the formulas for indicated power (ip) for both 4-stroke and 2-stroke engines, though specific formulas for ip were not provided. Clarification was sought regarding the term "ip," with a suggestion that it might refer to indicated pressure. Understanding these formulas is crucial for evaluating engine performance and efficiency. The conversation highlights the importance of precise terminology in discussing engine mechanics.
aruneswaran
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what is the equation for the mechanical efficiency of an internal combustion engine?

what are the formulas for 'ip' for 4-stroke and 2-stroke engines?
thank you
 
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Mechanical efficiency n:

n = (Pb / Pig) = 1-(Pf / Pig)

Where Pb is the brake power, Pig is gross indicated power, and Pf the friction power.

What do you mean by ip? Indicated pressure?
 

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