Cummins QSK78
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.
Production StatusIn Production
QSK78 Series
- Mechanical Output
- 3,312 kW
- Cylinders
- V18
- Displacement
- 77.627 L
- Rated Speed
- 1,500 RPM
Estimated electrical output
Engine power × 0.90. These are estimates, not manufacturer generator ratings. Actual output depends on the alternator and operating conditions.
| Frequency / duty | Engine | Estimate |
|---|---|---|
| Frequency and duty unverified | 3,312 kWm | 2,980.8 kWe |
Datasheet & documents
Match the model number on your engine plate to the document. Check its revision date and the speed and duty listed for each power rating.
Technical specifications
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 |
Check your engine model
The Cummins QSK78 is a diesel generator-drive engine for applications whose frequency must be verified, rated at 3,312 kW / standby rating. Match the model and serial number on your engine plate when requesting a manual or parts. The ratings and emissions information below help identify the version fitted to your generator.
Other ways this model is written
qsk78Cummins QSK78QSK78 Series QSK78
QSK78 repair parts
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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.