Cummins B3.9CS4GT3 vs Deutz F4L913
The Cummins B3.9CS4GT3 and Deutz F4L913 are both diesel generator engines in a similar power class. Both are rated at roughly 42 kVA. Displacement is 3.9 L versus 4.086 L. The table below compares their full specifications side by side.
| Specification | Cummins B3.9CS4GT3 | Deutz F4L913 |
|---|---|---|
| Headline rating | 41 kVA | 42 kVA |
| Standby (50 Hz) | 33 kWe | 33.3 kWe |
| Prime (50 Hz) | 30 kWe | 30.6 kWe |
| Standby (60 Hz) | — | 39.6 kWe |
| Prime (60 Hz) | — | 36 kWe |
| Displacement | 3.9 L | 4.086 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Air-Cooled |
| Emissions | China IV | Unregulated |
| Dry weight | — | — |
| Origin | China | Germany |
Choosing between Cummins B3.9CS4GT3 and Deutz F4L913
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 Deutz F4L913 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.