Cummins B3.9CS4GT1 vs Kohler KDI3404TM
The Cummins B3.9CS4GT1 and Kohler KDI3404TM are both diesel generator engines in a similar power class. Both are rated at roughly 75 kVA. Displacement is 3.9 L versus 3.4 L. The table below compares their full specifications side by side.
| Specification | Cummins B3.9CS4GT1 | Kohler KDI3404TM |
|---|---|---|
| Headline rating | 75 kVA | 75 kVA |
| Standby (50 Hz) | 60 kWe | — |
| Prime (50 Hz) | 60 kWe | — |
| Standby (60 Hz) | — | 60 kWe |
| Prime (60 Hz) | — | 54 kWe |
| Displacement | 3.9 L | 3.4 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel/HVO |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | China IV | U.S. EPA Tier 3 |
| Dry weight | — | — |
| Origin | China | Italy |
Choosing between Cummins B3.9CS4GT1 and Kohler KDI3404TM
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.