PSI 8.1L vs Weichai WP4D77E301NG
The PSI 8.1L and Weichai WP4D77E301NG are both natural gas generator engines in a similar power class. Both are rated at roughly 75 kVA. Displacement is 8.06 L versus 4.1 L. The table below compares their full specifications side by side.
| Specification | PSI 8.1L | Weichai WP4D77E301NG |
|---|---|---|
| Headline rating | 75 kVA | 75 kVA |
| Standby (50 Hz) | 60 kWe | — |
| Prime (50 Hz) | 55 kWe | 60 kWe |
| Standby (60 Hz) | 85 kWe | — |
| Prime (60 Hz) | 75 kWe | — |
| Displacement | 8.06 L | 4.1 L |
| Configuration | L6 | L4 |
| Cylinders | 6 | 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 | 998 kg | — |
| Origin | United States | China |
Choosing between PSI 8.1L and Weichai WP4D77E301NG
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.