Compression ratio rk = (V_s + V_c) / V_c - dominant driver of Otto/Diesel cycle efficiency.
Formula
$$ r_k = \frac{V_s + V_c}{V_c} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_s$ | Swept volume = π/4·bore²·stroke | L | engine spec |
| $V_c$ | Clearance volume | L | engine spec |
| $r_k$ | Compression ratio | - | result |
Sources
- Heywood - Internal Combustion Engine Fundamentals.