Indicated Mean Effective Pressure (IMEP)

IMEP derived from indicator-card area - the fundamental input for cylinder-balance and performance-trend checks.

Engine

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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

IMEP = \frac{\text{Card area}}{\text{Card length}} \cdot \text{Spring scale}

Symbol	Meaning	Unit
$Card area$	Planimetered area of indicator diagram	mm²
$Card length$	Horizontal length of one cycle	mm
$Spring scale$	Pressure per mm of card height	bar/mm
$IMEP$	Indicated MEP	bar

Source: Pounder's Marine Diesel Engines Ch.3

IMEP derived from indicator-card area - the fundamental input for cylinder-balance and performance-trend checks.