Indicated Mean Effective Pressure Calculator
Calculate IMEP to understand the pressure developed inside the cylinder during combustion, before mechanical losses.
Power from combustion (before friction)
IMEP Results
IMEP (PSI)
33.3
IMEP (Bar)
2.29
IMEP (kPa)
229
Est. Peak Cylinder Pressure
100 - 133 psi
Work Per Cycle (Total)
338.46 ft-lb
Cylinder Displacement
500 cc each
Power Per Cylinder
100.0 HP
Combustion Efficiency
Below Average - Room for improvement
Friction Loss Estimates (88% Mechanical Efficiency)
Estimated BMEP
29.3 psi
FMEP (Friction)
4.0 psi
Friction Power Loss
48 HP
IMEP vs BMEP
IMEP represents the work done by gas pressure on the pistons (indicated work), while BMEP represents the useful work available at the crankshaft (brake work). The difference (FMEP) accounts for friction, pumping losses, and accessory drives. IMEP is typically measured using cylinder pressure transducers and P-V diagrams.