Cummins
Cummins QSK78
QSK78 Series
Cummins QSK78 77.627 L V18 diesel engine for generator and industrial constant-speed applications. EPA annual certification data lists up to 3,312 kW mechanical power at 1800 RPM. U.S. EPA Tier 2 / U.S. EPA Interim Tier 4 / U.S. EPA Final Tier 4. Electrical ratings are stored only where an official Cummins generator-set rating card identifies the exact engine model.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-24
- Package route
- diesel generator sets
- Mechanical Output
- 3,312 kW
- Cylinders
- V18
- Displacement
- 77.627 L
- Rated Speed
- 1,500 RPM
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Cummins QSK78 overhaul & repair parts
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Cummins QSK78 generator set context
The Cummins QSK78 is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 3,312 kW / 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 | QSK78 |
| Series | QSK78 Series |
| Configuration | V18 |
| Cylinders | 18 |
| Displacement | 77.627 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 2 / U.S. EPA Interim Tier 4 / U.S. EPA Final Tier 4 |
| Certifications | U.S. EPA Tier 2, U.S. EPA Interim Tier 4, U.S. EPA Final Tier 4 |
| Country of Origin | United States |
Frequently asked questions
What fuel does the Cummins QSK78 use?
The Cummins QSK78 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the QSK78?
The Cummins QSK78 is a V18 (18-cylinder) engine with a displacement of 77.627 L.
What emissions information is listed for the QSK78?
This record lists U.S. EPA Tier 2 / U.S. EPA Interim Tier 4 / U.S. EPA Final Tier 4 for the Cummins QSK78. 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 QSK78?
The Cummins QSK78 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the QSK78?
This page links reference documents for the Cummins QSK78. Check each document's title, model coverage, revision and rating conditions before using it for selection.