Cummins QSB5.9-G31 vs Detroit Diesel 8V71
Compare Cummins QSB5.9-G31 and Detroit Diesel 8V71 by recorded output, operating duty, frequency and engine specifications. Their listed displacements are 5.9 L and 9.3 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 | Cummins QSB5.9-G31 | Detroit Diesel 8V71 |
|---|---|---|
| Standby electrical (50 Hz) | 125 kWe | 125 kWe |
| Prime electrical (50 Hz) | 100 kWe | 113 kWe |
| Standby electrical (60 Hz) | Not listed | 150 kWe |
| Prime electrical (60 Hz) | Not listed | 135 kWe |
| Displacement | 5.9 L | 9.3 L |
| Configuration | L6 | V8 |
| Cylinders | 6 | 8 |
| Recorded engine speed | 1,500 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Recorded emissions classification | Unregulated | Unregulated |
| Dry weight | Not listed | Not listed |
| Origin | China | 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.
Cummins QSB5.9-G31: Review the model record and available supporting documents
Detroit Diesel 8V71: Review the model record and available supporting documents
Choosing between Cummins QSB5.9-G31 and Detroit Diesel 8V71
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.