Ford LSG635 vs Generac SG040
Compare Ford LSG635 and Generac SG040 by catalog output, operating duty, frequency and engine specifications. Their listed displacements are 3.5 L and 4.43 L, respectively. Start with the same duty and frequency, then check each model’s source and package conditions. These records alone do not establish interchangeability.
| Specification | Ford LSG635 | Generac SG040 |
|---|---|---|
| Standby electrical (50 Hz) | Not listed | Not listed |
| Prime electrical (50 Hz) | Not listed | Not listed |
| Standby electrical (60 Hz) | Not listed | 40 kWe |
| Prime electrical (60 Hz) | 41 kWe | 36 kWe |
| Other recorded mechanical power (duty unspecified) | 45.6 kW | 45.5 kW |
| Displacement | 3.5 L | 4.43 L |
| Configuration | V6 | L4 |
| Cylinders | 6 | 4 |
| Recorded engine speed | 1,800 RPM | 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Recorded emissions classification | U.S. EPA Stationary | U.S. EPA Stationary |
| Dry weight | 177 kg | Not listed |
| Origin | United States | United States |
Compare matching ratings
Read across a row to compare the same operating duty and frequency. kWe is electrical output; mechanical kW is power at the engine shaft. kVA is apparent electrical power and is shown only when kWe is missing, without converting it. “Not listed” means the record lacks that rating, not zero output. Continuous and prime duties are kept separate. Check source documents, units and site conditions before comparing values.
An emissions classification in the catalog is not proof of certification for your engine or installation. Confirm the exact model, applicable documents and generator configuration.
Ford LSG635: Review the model record and available supporting documents
Generac SG040: Review the model record and available supporting documents
Choosing between Ford LSG635 and Generac SG040
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.