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.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-25
- Package route
- gas generator sets
- Mechanical Output
- 294 kW
- Cylinders
- L6
- Displacement
- 11.1 L
- Rated Speed
- 1,500 RPM
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Mesa GX12 overhaul & repair parts
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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 information is listed for the GX12?
This record lists U.S. EPA Stationary for the Mesa GX12. 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 Mesa GX12?
The Mesa GX12 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 GX12?
This page links reference documents for the Mesa GX12. Check each document's title, model coverage, revision and rating conditions before using it for selection.