Mechanical Efficiency (η_m)
Ratio of brake to indicated power. A falling η_m at fixed IMEP is the earliest sign of rising friction (piston rings, bearings, seals).
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Brake power | kW | |
| Indicated power | kW | |
| Mechanical efficiency | ||
| Friction power loss | kW |
Source: Pounder's Marine Diesel Engines
In short
Ratio of brake to indicated power.