PSI 6.7L vs Weichai WP4D77E301NG
The PSI 6.7L and Weichai WP4D77E301NG are both natural gas generator engines in a similar power class. Both are rated at roughly 74 kVA. Displacement is 6.75 L versus 4.1 L. The table below compares their full specifications side by side.
| Specification | PSI 6.7L | Weichai WP4D77E301NG |
|---|---|---|
| Headline rating | 73 kVA | 75 kVA |
| Standby (50 Hz) | 58 kWe | — |
| Prime (50 Hz) | 55 kWe | 60 kWe |
| Standby (60 Hz) | 70 kWe | — |
| Prime (60 Hz) | 70 kWe | — |
| Displacement | 6.75 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 | 680 kg | — |
| Origin | United States | China |
Choosing between PSI 6.7L 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. The Weichai WP4D77E301NG has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.