Mean Effective Pressure - PME vs BMEP

Relationship between indicated (PMI) and brake (BMEP) mean effective pressure with mechanical efficiency - cross-checks indicator card against brake power test.

EngineBMEPIndicator

Loading calculator…

This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{BMEP} = \eta_{mech} \cdot \text{PMI}, \quad \text{FMEP} = \text{PMI} - \text{BMEP}

Symbol	Meaning	Unit
$PMI$	Indicated mean effective pressure	bar
$BMEP$	Brake mean effective pressure	bar
$FMEP$	Friction mean effective pressure	bar
$\eta_{mech}$	Mechanical efficiency

Source: MAN ES Performance Guide

In short

Relationship between indicated (PMI) and brake (BMEP) mean effective pressure with mechanical efficiency - cross-checks indicator card against brake power test.

Learn the theory Engine Performance Monitoring: PMI Systems