Indicated Mean Effective Pressure (IMEP)
IMEP derived from indicator-card area - the fundamental input for cylinder-balance and performance-trend checks.
IMEP
80.00bar
Formula, assumptions, and limits
Indicator card area / length gives average pressure; multiplied by spring scale (pressure per mm of card height) gives IMEP. Modern electronic indicators (Kyma, Icon, Doctor) bypass the mechanical card and compute IMEP directly.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Planimetered area of indicator diagram | mm² | planimeter / digital reading | |
| Horizontal length of one cycle | mm | ruler | |
| Pressure per mm of card height | bar/mm | indicator spring | |
| Indicated MEP | bar | result |