Mechanical efficiency of IC engine

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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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