Mesa
Mesa GX12
GX
Mesa GX12 is an 11.1 L inline-6 turbocharged and intercooled spark-ignited gas engine based on the HD Hyundai GX12P platform. Mesa identifies the GX12 as its four-valve 11.1 L engine, while HD Hyundai lists 294 kW maximum power. The 2026 Mesa EPA family TMSAB11.1XS1 covers a matching 294 kW node at the 1800 RPM certification test speed.
- Electrical Output
- 294 kW
- Cylinders
- L6
- Displacement
- 11.1 L
- Rated Speed
- 1,500 RPM
Mesa GX12 generator set context
The Mesa GX12 is listed here as a natural gas generator-drive engine for 50 Hz generator sets, with a headline 294 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 | Mesa |
| Model | GX12 |
| Series | GX |
| Configuration | L6 Turbocharged Intercooled |
| Cylinders | 6 |
| Displacement | 11.1 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 Nonroad Mobile, U.S. EPA NSPS Subpart JJJJ |
| Country of Origin | South Korea / United States |
Frequently asked questions
What fuel does the Mesa GX12 use?
The Mesa GX12 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the GX12?
The Mesa GX12 is an inline-6 (6-cylinder) engine with a displacement of 11.1 L.
What emissions standard does the GX12 meet?
The Mesa GX12 is certified to U.S. EPA Stationary emissions standards.
Is the Mesa GX12 still in production?
Yes — the Mesa GX12 is a current production model.
Is a datasheet available for the GX12?
Yes — an official Mesa datasheet for the Mesa GX12 can be downloaded from this page.
Related Engines
Reference
- Canonical page
- /engines/mesa-gx12
- Last database update
- 2026-07-25
- Manufacturer files
- 1 datasheet linked
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