Cummins QSK23G6 vs Perkins 4008TAG
The Cummins QSK23G6 and Perkins 4008TAG are both diesel generator engines in a similar power class. Both are rated at roughly 934 kVA. Displacement is 23 L versus 30 L. The table below compares their full specifications side by side.
| Specification | Cummins QSK23G6 | Perkins 4008TAG |
|---|---|---|
| Headline rating | 938 kVA | 929 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 750 kWe | 743 kWe |
| Prime (60 Hz) | 682 kWe | 676 kWe |
| Displacement | 23 L | 30 L |
| Configuration | L6 | V8 |
| Cylinders | 6 | 8 |
| Rated speed | 1,800 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 2 | Unregulated |
| Dry weight | — | — |
| Origin | India | India / United Kingdom |
Choosing between Cummins QSK23G6 and Perkins 4008TAG
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 QSK23G6 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.