Internal Combustion Engine Performance Calculator

Calculate key performance metrics for internal combustion engines including power output, torque, efficiency, and more.

Engine Type:

Engine Displacement (cc):

Number of Cylinders:

Engine Speed (RPM):

Brake Mean Effective Pressure (BMEP) (bar):

Typical values: Gasoline 8-12 bar, Diesel 7-20 bar

Thermal Efficiency (%):

Typical values: Gasoline 25-30%, Diesel 30-45%

Air-Fuel Ratio (AFR):

Stoichiometric: Gasoline ~14.7, Diesel ~14.5

Performance Results

Brake Power (BP)

0 kW (0 hp)

Power available at the engine output shaft

Torque

0 N·m (0 lb·ft)

Rotational force produced by the engine

Specific Fuel Consumption (BSFC)

0 g/kWh (0 lb/hp·hr)

Fuel efficiency measure (lower is better)

Volumetric Efficiency

Effectiveness of air intake into cylinders

Air Flow Rate

0 kg/h

Mass flow rate of air through the engine

Fuel Flow Rate

0 kg/h

Mass flow rate of fuel consumption

About Internal Combustion Engine Performance

Engine performance is measured by several key parameters including power output, torque, fuel efficiency, and volumetric efficiency. This calculator helps engineers, mechanics, and automotive enthusiasts estimate these critical performance metrics based on fundamental engine parameters.

Key Terms Explained:

Brake Power (BP): The actual power available at the engine’s output shaft, accounting for all losses.
Torque: The rotational force produced by the engine, which determines the vehicle’s acceleration capability.
BMEP (Brake Mean Effective Pressure): A measure of the average pressure exerted on the pistons during the power stroke.
Thermal Efficiency: The percentage of fuel energy converted to useful mechanical work.
Volumetric Efficiency: Measures how effectively the engine fills its cylinders with air during the intake stroke.