PSI
PSI 4.5L
PSI 4.5L — 4.5 L L4 (105 × 130 mm bore × stroke) naturally aspirated natural gas / propane generator engine, 9.75:1 compression, 500 kg dry. From the official PSI 4.5L spec sheet (LPG prime 36/40 kWe (50/60 Hz)).
- Standby Power · 50 Hz
- 51 kVA
- Electrical Output
- 41 kWe
- Cylinders
- L4
- Displacement
- 4.5 L
- Rated Speed
- 1,500 / 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 44 | 35 | 43.8 |
| Standby Power | 45 | 41 | 51.3 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 50 | 40 | 50 |
| Standby Power | 50 | 45 | 56.3 |
PSI 4.5L generator set context
The PSI 4.5L is listed here as a natural gas generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 51 kVA / 41 kWe / 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 | PSI |
| Model | 4.5L |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 4.5 L |
| Compression Ratio | 9.75:1 |
| Dry Weight | 500 kg |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Stationary |
| Certifications | EPA |
| Country of Origin | United States |
Frequently asked questions
What is the power output of the PSI 4.5L?
The PSI 4.5L is rated at 51 kVA standby / 44 kVA prime at 50 Hz (1,500 rpm); and 56 kVA standby / 50 kVA prime at 60 Hz (1,800 rpm).
Does the 4.5L run at 50 Hz or 60 Hz?
The PSI 4.5L is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the PSI 4.5L use?
The PSI 4.5L is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the 4.5L?
The PSI 4.5L is an inline-4 (4-cylinder) engine with a displacement of 4.5 L.
What emissions standard does the 4.5L meet?
The PSI 4.5L is certified to U.S. EPA Stationary emissions standards.
Is the PSI 4.5L still in production?
Yes — the PSI 4.5L is a current production model.
Is a datasheet available for the 4.5L?
Yes — an official PSI datasheet for the PSI 4.5L can be downloaded from this page.
Related Engines
Reference
- Canonical page
- /engines/psi-gas-4-5l
- Last database update
- 2026-06-29
- Manufacturer files
- 2 datasheets linked
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