Cummins NTA855-G3 vs Isuzu 6WG1X
The Cummins NTA855-G3 and Isuzu 6WG1X are both diesel generator engines in a similar power class. Both are rated at roughly 438 kVA. Displacement is 14 L versus 15.681 L. The table below compares their full specifications side by side.
| Specification | Cummins NTA855-G3 | Isuzu 6WG1X |
|---|---|---|
| Headline rating | 438 kVA | 437 kVA |
| Standby (50 Hz) | — | 349.5 kWe |
| Prime (50 Hz) | — | 317.7 kWe |
| Standby (60 Hz) | 350 kWe | 378.2 kWe |
| Prime (60 Hz) | 315 kWe | 343.8 kWe |
| Displacement | 14 L | 15.681 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | U.S. EPA Final Tier 4 |
| Dry weight | — | — |
| Origin | China | Japan |
Choosing between Cummins NTA855-G3 and Isuzu 6WG1X
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 Cummins NTA855-G3 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.