Caterpillar C9.3 vs Yuchai YC6MK420-D30
The Caterpillar C9.3 and Yuchai YC6MK420-D30 are both diesel generator engines in a similar power class. Both are rated at roughly 344 kVA. Displacement is 9.3 L versus 10.338 L. The table below compares their full specifications side by side.
| Specification | Caterpillar C9.3 | Yuchai YC6MK420-D30 |
|---|---|---|
| Headline rating | 344 kVA | 344 kVA |
| Standby (50 Hz) | 275 kWe | 275 kWe |
| Prime (50 Hz) | 250 kWe | 250 kWe |
| Standby (60 Hz) | 330 kWe | — |
| Prime (60 Hz) | 300 kWe | — |
| Displacement | 9.3 L | 10.338 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 3 | China National Stage III / Unregulated |
| Dry weight | — | — |
| Origin | United States | China |
Choosing between Caterpillar C9.3 and Yuchai YC6MK420-D30
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.