Caterpillar C6.6 vs Cummins QSB5.9-G31
The Caterpillar C6.6 and Cummins QSB5.9-G31 are both diesel generator engines in a similar power class. Both are rated at roughly 156 kVA. Displacement is 6.6 L versus 5.9 L. The table below compares their full specifications side by side.
| Specification | Caterpillar C6.6 | Cummins QSB5.9-G31 |
|---|---|---|
| Headline rating | 156 kVA | 156 kVA |
| Standby (50 Hz) | 125 kWe | 125 kWe |
| Prime (50 Hz) | 113 kWe | 100 kWe |
| Standby (60 Hz) | 150 kWe | — |
| Prime (60 Hz) | 136 kWe | — |
| Displacement | 6.6 L | 5.9 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 3 | Unregulated |
| Dry weight | — | — |
| Origin | USA | China |