Compression Ratio
Compression ratio rk = (V_s + V_c) / V_c - dominant driver of Otto/Diesel cycle efficiency.
Swept volume V_s
1,590.4L
Compression ratio r_k
27.51 -
Formula, assumptions, and limits
Large two-stroke marine diesel typically 12–14. Medium-speed 12–16. Dual-fuel gas engines keep rk around 12 to avoid knock. Raising rk by 1 adds ~1 % BSFC but raises Pmax and NOx.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Swept volume = π/4·bore²·stroke | L | engine spec | |
| Clearance volume | L | engine spec | |
| Compression ratio | - | result |