Otto Cycle Calculator

Calculate ideal Otto cycle (spark-ignition engine) efficiency, work output, and mean effective pressure.

Volume ratio V1/V2. Typical gasoline: 8-12.
Air temperature at start of compression.
°C
Pressure at start of compression.
kPa
Heat added per kg of air during combustion.
kJ/kg
Air: 1.4, Combustion gases: 1.3-1.35.

Results

Thermal Efficiency-%
Net Work per kg-kJ/kg
Peak Temperature-°C
Mean Effective Pressure-kPa
References: Cengel — Thermodynamics; Heywood — Internal Combustion Engines