SDEC 6ETAA12.8-G22 vs Yuchai YCMJ12550-D40
The SDEC 6ETAA12.8-G22 and Yuchai YCMJ12550-D40 are both diesel generator engines in a similar power class. Both are rated at roughly 423 kVA. Displacement is 12.8 L versus 11.73 L. The table below compares their full specifications side by side.
| Specification | SDEC 6ETAA12.8-G22 | Yuchai YCMJ12550-D40 |
|---|---|---|
| Headline rating | 420 kVA | 425 kVA |
| Standby (50 Hz) | 336 kWe | 340 kWe |
| Prime (50 Hz) | 305 kWe | 320 kWe |
| Standby (60 Hz) | 365 kWe | — |
| Prime (60 Hz) | 331 kWe | — |
| Displacement | 12.8 L | 11.73 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 | China National Stage III / Unregulated | China National Stage IV / Unregulated |
| Dry weight | — | — |
| Origin | China | China |
Choosing between SDEC 6ETAA12.8-G22 and Yuchai YCMJ12550-D40
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 Yuchai YCMJ12550-D40 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.