Generac
Generac G12.9L G20
Legacy Liquid-Cooled Gas
Generac G12.9L G20 is a legacy 12.9 L inline-six spark-ignited industrial generator engine used across historical SG and MG 150-300 kW gaseous generator sets. EPA families CGNXB12.92C1, CGNXB12.92C2, CGNXB12.92N1 and DGNXB12.92C4 record matching stationary 1800 RPM configurations at approximately 226-230 kWm.
- Electrical Output
- 230 kW
- Cylinders
- L6
- Displacement
- 12.9 L
- Rated Speed
- 1,500 RPM
Generac G12.9L G20 generator set context
The Generac G12.9L G20 is listed here as a natural gas generator-drive engine for 50 Hz generator sets, with a headline 230 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 | Generac |
| Model | G12.9L G20 |
| Series | Legacy Liquid-Cooled Gas |
| Configuration | L6 Turbocharged Aftercooled |
| Cylinders | 6 |
| Displacement | 12.9 L |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Stationary |
| Certifications | U.S. EPA Stationary, U.S. EPA NSPS Subpart JJJJ |
| Country of Origin | United States |
| Year Introduced | 2012 |
| Year Discontinued | 2022 |
Frequently asked questions
What fuel does the Generac G12.9L G20 use?
The Generac G12.9L G20 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the G12.9L G20?
The Generac G12.9L G20 is an inline-6 (6-cylinder) engine with a displacement of 12.9 L.
What emissions standard does the G12.9L G20 meet?
The Generac G12.9L G20 is certified to U.S. EPA Stationary emissions standards.
Is the G12.9L G20 still in production?
No — the Generac G12.9L G20 is discontinued (production ended around 2022). Its specifications and datasheets remain archived here for reference.
Reference
- Canonical page
- /engines/generac-legacy-g12-9l-g20
- Last database update
- 2026-07-25
- Manufacturer files
- No datasheet linked yet
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