Ratio of peak firing pressure (Pmax) to compression pressure (Pcomp) - the simplest indicator of injection timing quality on a slow-speed 2-stroke.
Formula
$$ r = \frac{p_{max}}{p_{comp}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $p_{comp}$ | Compression pressure (no fuel) | bar | electronic indicator |
| $p_{max}$ | Peak firing pressure | bar | PiMax sensor |
Sources
- MAN ES Operation Manual.
- WinGD X-Series Engine Data.