Cummins QSK19-G12 vs VMAN D22A2
The Cummins QSK19-G12 and VMAN D22A2 are both diesel generator engines in a similar power class. Both are rated at roughly 634 kVA. Displacement is 19 L versus 21.927 L. The table below compares their full specifications side by side.
| Specification | Cummins QSK19-G12 | VMAN D22A2 |
|---|---|---|
| Headline rating | 631 kVA | 636 kVA |
| Standby (50 Hz) | 505 kWe | 509 kWe |
| Prime (50 Hz) | 460 kWe | 464 kWe |
| Standby (60 Hz) | — | — |
| Prime (60 Hz) | — | — |
| Displacement | 19 L | 21.927 L |
| Configuration | L6 | V12 |
| Cylinders | 6 | 12 |
| Rated speed | 1,500 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | China National Stage III / Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | China | China |
Choosing between Cummins QSK19-G12 and VMAN D22A2
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The VMAN D22A2 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.