Cummins QSK38-G8 vs Perkins 4006-23TAG2A
The Cummins QSK38-G8 and Perkins 4006-23TAG2A are both diesel generator engines in a similar power class. Both are rated at roughly 821 kVA. Displacement is 37.7 L versus 23 L. The table below compares their full specifications side by side.
| Specification | Cummins QSK38-G8 | Perkins 4006-23TAG2A |
|---|---|---|
| Headline rating | 821 kVA | 820 kVA |
| Standby (50 Hz) | 657 kWe | 656 kWe |
| Prime (50 Hz) | 591 kWe | 597 kWe |
| Standby (60 Hz) | — | 660 kWe |
| Prime (60 Hz) | — | 600 kWe |
| Displacement | 37.7 L | 23 L |
| Configuration | V12 | V6 |
| Cylinders | 12 | 6 |
| Rated speed | 1,500 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 2 | Unregulated |
| Dry weight | — | — |
| Origin | United States | United Kingdom |
Choosing between Cummins QSK38-G8 and Perkins 4006-23TAG2A
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 QSK38-G8 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.