PSI INDUSTRIAL ENGINES
DiscontinuedPSI Legacy 3.0L L4
Legacy Industrial
PSI Legacy 3.0L L4 is a liquid-cooled spark-ignited industrial engine platform. PSI publishes the official 3.0 L engine service manual, while EPA lineage 9PSIB2.972ED identifies the 2.972 L four-cylinder stationary natural-gas configuration at 1800 RPM. The 36.7 kW value is the EPA certification power node, not a claimed generator-set electrical rating.
Cylinders / Config
L4 Naturally Aspirated
Displacement
2.972 L
Mechanical & Electrical Specifications
| Brand | PSI |
| Model | Legacy 3.0L L4 |
| Series | Legacy Industrial |
| Configuration | L4 Naturally Aspirated |
| Cylinders | 4 |
| Displacement | 2.972 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 | 2011 |
| Year Discontinued | 2016 |
Frequently Asked Questions
What fuel does the PSI Legacy 3.0L L4 use?
The PSI Legacy 3.0L L4 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the Legacy 3.0L L4?
The PSI Legacy 3.0L L4 is an inline-4 (4-cylinder) engine with a displacement of 2.972 L.
What emissions standard does the Legacy 3.0L L4 meet?
The PSI Legacy 3.0L L4 is certified to U.S. EPA Stationary emissions standards.
Is the Legacy 3.0L L4 still in production?
No — the PSI Legacy 3.0L L4 is discontinued (production ended around 2016). Its specifications and datasheets remain archived here for reference.
Is a datasheet available for the Legacy 3.0L L4?
Yes — an official PSI datasheet for the PSI Legacy 3.0L L4 can be downloaded from this page.