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Brake Mean Effective Pressure Calculator — result sheet
Calculate brake mean effective pressure from engine torque, displacement, and two- or four-stroke cycle selection.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: BMEP = 2πTn/Vd, where n is 2 crankshaft revolutions per cycle for four-stroke and 1 for two-stroke operation.
BMEP expresses torque as an equivalent average pressure over swept displacement, making engines with different sizes easier to compare.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Brake torque — N·m; minimum 1.0E-6; maximum 100000000
- Total displacement — L; minimum 1.0E-6; maximum 1000000
- Engine cycle — 2 choices
Worked example
| Input | Value |
|---|---|
| Brake torque | 200 |
| Total displacement | 2 |
| Engine cycle | four |
BMEP is about 1,257 kPa (12.57 bar).
Assumptions and limits
- Torque is brake torque and displacement is total swept displacement in litres.
- The cycle selection supplies the ideal revolution count per thermodynamic cycle.
- Peak cylinder pressure, friction breakdown, pumping losses, combustion timing, and engine durability are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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