Cummins QSB5G2 vs Yuchai YC4A100Z-D20
The Cummins QSB5G2 and Yuchai YC4A100Z-D20 are both diesel generator engines in a similar power class. Both are rated at roughly 80 kVA. Displacement is 4.5 L versus 4.837 L. The table below compares their full specifications side by side.
| Specification | Cummins QSB5G2 | Yuchai YC4A100Z-D20 |
|---|---|---|
| Headline rating | 80 kVA | 80 kVA |
| Standby (50 Hz) | 64 kWe | 64 kWe |
| Prime (50 Hz) | 58 kWe | 60 kWe |
| Standby (60 Hz) | 70 kWe | — |
| Prime (60 Hz) | 65 kWe | — |
| Displacement | 4.5 L | 4.837 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 3 / EU Stage IIIA / China III | China National Stage II / Unregulated |
| Dry weight | — | — |
| Origin | United States / United Kingdom | China |
Choosing between Cummins QSB5G2 and Yuchai YC4A100Z-D20
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.