Cummins C550N6 vs Weichai 12M26D660E301NG
The Cummins C550N6 and Weichai 12M26D660E301NG are both natural gas generator engines in a similar power class. Both are rated at roughly 688 kVA. Displacement is 37.7 L versus 31.2 L. The table below compares their full specifications side by side.
| Specification | Cummins C550N6 | Weichai 12M26D660E301NG |
|---|---|---|
| Headline rating | 688 kVA | 688 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | 550 kWe |
| Standby (60 Hz) | 550 kWe | 540 kWe |
| Prime (60 Hz) | — | — |
| Displacement | 37.7 L | 31.2 L |
| Configuration | V12 | V12 |
| Cylinders | 12 | 12 |
| Rated speed | 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | Unregulated |
| Dry weight | — | — |
| Origin | United States | China |
Choosing between Cummins C550N6 and Weichai 12M26D660E301NG
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.