PSI 5.7L vs Yuchai YC4D90N-D30
The PSI 5.7L and Yuchai YC4D90N-D30 are both natural gas generator engines in a similar power class. The PSI 5.7L is the higher-output unit (69 kVA vs 63 kVA). Displacement is 5.74 L versus 4.214 L. The table below compares their full specifications side by side.
| Specification | PSI 5.7L | Yuchai YC4D90N-D30 |
|---|---|---|
| Headline rating | 69 kVA | 63 kVA |
| Standby (50 Hz) | 55 kWe | — |
| Prime (50 Hz) | 50 kWe | 50 kWe |
| Standby (60 Hz) | 60 kWe | — |
| Prime (60 Hz) | 55 kWe | — |
| Displacement | 5.74 L | 4.214 L |
| Configuration | V8 | L4 |
| Cylinders | 8 | 4 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | Unregulated |
| Dry weight | 196 kg | — |
| Origin | United States | China |
Choosing between PSI 5.7L and Yuchai YC4D90N-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. The PSI 5.7L has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.