Cummins QSB3.9-G33 vs Kirloskar 4R1040
The Cummins QSB3.9-G33 and Kirloskar 4R1040 are both diesel generator engines in a similar power class. Both are rated at roughly 48 kVA. Displacement is 3.9 L versus 4.2 L. The table below compares their full specifications side by side.
| Specification | Cummins QSB3.9-G33 | Kirloskar 4R1040 |
|---|---|---|
| Headline rating | 48 kVA | 48 kVA |
| Standby (50 Hz) | 38 kWe | 38.3 kWe |
| Prime (50 Hz) | 30 kWe | 34.9 kWe |
| Standby (60 Hz) | — | 45.6 kWe |
| Prime (60 Hz) | — | 41 kWe |
| Displacement | 3.9 L | 4.2 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | U.S. EPA Tier 2 |
| Dry weight | — | — |
| Origin | China | India |