Otto Cycle Efficiency Calculator

Otto Cycle Efficiency Equation

$$ \eta = 1- \frac{1}{r^{\gamma - 1}} $$ where:

η = Efficiency (Dimensionless)

r = Compression Ratio (Dimensionless)

γ = Heat Capacity Ratio (Dimensionless)

Calculator

Property to Calculate:

Efficiency (η):

Compression Ratio (r):

Heat Capacity Ratio (γ):

Equation Assumptions

The working fluid behaves as an ideal gas.
Specific heats remain constant.
Compression and expansion processes are adiabatic.
There is perfect mixing of the air and fuel.