Cummins QSJ2.4G vs Ford LSG635
The Cummins QSJ2.4G and Ford LSG635 are both natural gas generator engines in a similar power class. Both are rated at roughly 51 kVA. Displacement is 2.4 L versus 3.5 L. The table below compares their full specifications side by side.
| Specification | Cummins QSJ2.4G | Ford LSG635 |
|---|---|---|
| Headline rating | 50 kVA | 51 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 40 kWe | — |
| Prime (60 Hz) | — | 41 kWe |
| Displacement | 2.4 L | 3.5 L |
| Configuration | L4 | V6 |
| Cylinders | 4 | 6 |
| Rated speed | 1,800 RPM | 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | U.S. EPA Stationary |
| Dry weight | — | 177 kg |
| Origin | United States | United States |
Choosing between Cummins QSJ2.4G and Ford LSG635
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 Ford LSG635 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.