Cummins QSK78G8 vs MTU MTU 20V4000 G44F
The Cummins QSK78G8 and MTU MTU 20V4000 G44F are both diesel generator engines in a similar power class. Both are rated at roughly 3,456 kVA. Displacement is 78 L versus 95.4 L. The table below compares their full specifications side by side.
| Specification | Cummins QSK78G8 | MTU MTU 20V4000 G44F |
|---|---|---|
| Headline rating | 3,438 kVA | 3,474 kVA |
| Standby (50 Hz) | — | 2,779 kWe |
| Prime (50 Hz) | — | 2,526 kWe |
| Standby (60 Hz) | 2,750 kWe | — |
| Prime (60 Hz) | 2,500 kWe | — |
| Displacement | 78 L | 95.4 L |
| Configuration | V18 | V20 |
| Cylinders | 18 | 20 |
| Rated speed | 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | United Kingdom | Germany |
Choosing between Cummins QSK78G8 and MTU MTU 20V4000 G44F
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 MTU MTU 20V4000 G44F has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.