Deutz F4L912 vs Isuzu 4JG1T
The Deutz F4L912 and Isuzu 4JG1T are both diesel generator engines in a similar power class. Both are rated at roughly 39 kVA. Displacement is 3.77 L versus 3.059 L. The table below compares their full specifications side by side.
| Specification | Deutz F4L912 | Isuzu 4JG1T |
|---|---|---|
| Headline rating | 39 kVA | 39 kVA |
| Standby (50 Hz) | 31.5 kWe | 31.1 kWe |
| Prime (50 Hz) | 28.8 kWe | 29.6 kWe |
| Standby (60 Hz) | 37.8 kWe | 37.8 kWe |
| Prime (60 Hz) | 34.2 kWe | 36 kWe |
| Displacement | 3.77 L | 3.059 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Air-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | Germany | Japan |
Choosing between Deutz F4L912 and Isuzu 4JG1T
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.