How to use the otto cycle efficiency calculator
Find the ideal efficiency of a petrol engine from its compression ratio. Enter compression ratio, heat capacity ratio in the fields above; the ideal otto efficiency is computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “petrol engine efficiency”, “Otto cycle”, “compression ratio efficiency”, “calculate otto cycle efficiency”, “find ideal otto efficiency”.
Formula
Variables
- r — Compression ratio
- gam — Heat capacity ratio
Worked example
With compression ratio = 9, heat capacity ratio = 1.4, the calculator gives ideal otto efficiency ≈ 58.47564 %.
Frequently asked questions
What is the otto cycle efficiency calculator used for?
Find the ideal efficiency of a petrol engine from its compression ratio. It helps with questions such as “petrol engine efficiency”, “Otto cycle”, “compression ratio efficiency”.
What is the formula for the otto cycle efficiency calculation?
Ideal Otto efficiency (%) = 100 × (1-r^(1-gam)). Here r is compression ratio, gam is heat capacity ratio.
What inputs do I need for the otto cycle efficiency calculator?
You need compression ratio, heat capacity ratio. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the otto cycle efficiency calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the otto cycle efficiency result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.