Cummins
Cummins QSK78G12
QSK Series
Cummins QSK78G12 generator-drive diesel engine discovered in the GenProBase public selector. GenProBase lists 1 row(s) across 60Hz with 78 L displacement, 18V cylinders, liquid-cooled cooling, and U.S. EPA Tier 2 emissions labeling. Treat this row as source-discovered and prioritize OEM datasheet attachment in a follow-up pass.
Overhaul & repair parts- Manufacturer files
- No datasheet
- Last updated
- 2026-08-05
- Package route
- diesel generator sets
- Standby Power · 60 Hz
- 3,438 kVA
- Electrical Output
- 2,750 kWe
- Cylinders
- V18
- Displacement
- 78 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 2737 | 2500 | — |
| Standby Power | 3028 | 2750 | — |
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Cummins QSK78G12 overhaul & repair parts
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Cummins QSK78G12 generator set context
The Cummins QSK78G12 is listed here as a diesel generator-drive engine for 60 Hz generator sets, with a headline 3,438 kVA / 2,750 kWe / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Cummins |
| Model | QSK78G12 |
| Series | QSK Series |
| Configuration | L18, turbocharged aftercooled |
| Cylinders | 18 |
| Displacement | 78 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 2 |
| Certifications | U.S. EPA Tier 2 |
| Country of Origin | United Kingdom |
Frequently asked questions
What is the power output of the Cummins QSK78G12?
The Cummins QSK78G12 is rated at 3,438 kVA standby / 3,125 kVA prime at 60 Hz (1,800 rpm).
Does the QSK78G12 run at 50 Hz or 60 Hz?
The Cummins QSK78G12 is rated for 60 Hz (1,800 rpm).
What fuel does the Cummins QSK78G12 use?
The Cummins QSK78G12 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the QSK78G12?
The Cummins QSK78G12 is a V18 (18-cylinder) engine with a displacement of 78 L.
What emissions information is listed for the QSK78G12?
This record lists U.S. EPA Tier 2 for the Cummins QSK78G12. Confirm the exact engine family, model year, configuration and applicable manufacturer certification documents before specifying it for a regulated project. A database label does not establish certification of a complete generator package.
What is the catalog status of the Cummins QSK78G12?
The Cummins QSK78G12 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.