BMEP Calculator
Calculate Brake Mean Effective Pressure for engine performance comparison
Calculate Brake Mean Effective Pressure
Number of revolutions per power stroke: 2
Brake torque output of the engine
Total swept volume of all cylinders
BMEP Results
Formula: BMEP = (2π × n × T) / D
Where: n = 2, T = 0.00 N⋅m, D = 0.000e+0 m³
Engine type: four-stroke
Engine Performance Analysis
Example Calculation
Four-Stroke Engine Example
Engine Type: Four-stroke (n = 2)
Torque: 160 N⋅m
Displacement: 2000 cc = 0.002 m³
Calculation Steps
BMEP = (2π × n × T) / D
BMEP = (2π × 2 × 160) / 0.002
BMEP = (2010.6) / 0.002
BMEP = 1,005,300 Pa = 1,005.3 kPa
Engine Types
Two-Stroke
n = 1 revolution/stroke
Higher power density
Four-Stroke
n = 2 revolutions/stroke
More efficient, cleaner
Custom
Variable n value
Experimental engines
Improve BMEP
Increase compression ratio
Supercharging or turbocharging
Optimize air-fuel mixture
Reduce stroke length
Improve combustion efficiency
Understanding Brake Mean Effective Pressure (BMEP)
What is BMEP?
Brake Mean Effective Pressure (BMEP) is a measure of the average pressure across the pistons that produces torque at the crankshaft. It's a crucial performance metric used to compare engines of different sizes and types.
Why is BMEP Important?
- •Enables fair comparison between different engines
- •Indicates engine efficiency and performance
- •Helps optimize engine design and tuning
- •Relates directly to torque output
BMEP Formula
BMEP = (2π × n × T) / D
- BMEP: Brake Mean Effective Pressure (Pa)
- n: Number of revolutions per power stroke
- T: Brake torque (N⋅m)
- D: Engine displacement (m³)
- 2π: Constant for rotational motion
Note: Higher BMEP values indicate more efficient engines with better power-to-displacement ratios.
Typical BMEP Values
Naturally Aspirated Gasoline
800-1200 kPa
Turbocharged Gasoline
1200-2000 kPa
Diesel Engines
1000-2200 kPa