BSFC Calculator
Calculate Brake Specific Fuel Consumption to measure engine efficiency and performance
Calculate BSFC & Engine Efficiency
Unit System
Power Input Method
Mass flow rate of fuel consumption
Brake power output of the engine
Energy density affects efficiency calculation
BSFC Results
Formula: BSFC = (Fuel Rate ÷ Power) × 3600
Fuel Consumption: 0 g/s
Engine Power: 0.0 kW
Energy Density: 0.01206 kWh/g
Lower BSFC = Better Efficiency
Performance Analysis
Example Calculation
Gasoline Engine Example
Engine Type: 250 kW gasoline engine
Fuel Consumption: 14.78 g/s
Fuel Type: Gasoline (0.01206 kWh/g)
Operating Conditions: Full load
Calculation Steps
1. BSFC = (14.78 g/s ÷ 250 kW) × 3600
2. BSFC = 0.05912 × 3600 = 212.83 g/kWh
3. Efficiency = 1 ÷ (0.01206 × 212.83) × 100%
4. Efficiency = 1 ÷ 2.567 × 100% = 38.96%
Result: 212.8 g/kWh BSFC, 39.0% efficiency
Typical BSFC Ranges
Understanding BSFC
Lower BSFC = Higher efficiency
Measures fuel consumption per unit power
Used for engine optimization
Critical for automotive design
Environmental impact indicator
Directly affects operating costs
Understanding Brake Specific Fuel Consumption
What is BSFC?
Brake Specific Fuel Consumption (BSFC) is a measure of engine efficiency that calculates how much fuel an engine consumes to produce a unit of power. It's expressed in grams of fuel per kilowatt-hour (g/kWh) or pounds per horsepower-hour (lb/hp⋅h).
Why is BSFC Important?
- •Measures actual engine efficiency under load
- •Enables comparison between different engines
- •Critical for fuel economy calculations
- •Used in engine optimization and tuning
Calculation Formulas
BSFC = (r ÷ P) × 3600
Efficiency = 1 ÷ (d × BSFC) × 100%
P = τ × ω (from torque & RPM)
- r: Fuel consumption rate (g/s)
- P: Brake power output (kW)
- d: Fuel energy density (kWh/g)
- τ: Torque (Nm)
- ω: Angular velocity (rad/s)
Note: BSFC values can vary significantly with engine load, speed, and operating conditions. Always consider the test conditions when comparing BSFC values.