Mitsubishi
Mitsubishi S4S
SS Series
Mitsubishi S4S 3.331 L L4 Naturally Aspirated diesel engine. The latest EPA certification record lists up to 35 kWm at 1800 RPM. U.S. EPA Tier 3 / U.S. EPA Interim Tier 4.
- Electrical Output
- 34 kW
- Cylinders
- L4
- Displacement
- 3.331 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 31.7 | — | — |
| Standby Power | 33.5 | — | — |
Note: The manufacturer does not publish a separate kWe rating for this engine. kWe values shown are estimated from the rated mechanical output (kWm) using a conservative 90% alternator efficiency factor.
Mitsubishi S4S generator set context
The Mitsubishi S4S is listed here as a diesel generator-drive engine for 60 Hz generator sets, with a headline 34 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 | Mitsubishi |
| Model | S4S |
| Series | SS Series |
| Configuration | L4 Naturally Aspirated |
| Cylinders | 4 |
| Displacement | 3.331 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 3 / U.S. EPA Interim Tier 4 |
| Certifications | U.S. EPA Tier 3, U.S. EPA Interim Tier 4 |
| Country of Origin | Japan |
Frequently asked questions
What is the power output of the Mitsubishi S4S?
The Mitsubishi S4S is rated at 42 kVA standby / 40 kVA prime at 60 Hz (1,800 rpm).
Does the S4S run at 50 Hz or 60 Hz?
The Mitsubishi S4S is rated for 60 Hz (1,800 rpm).
What fuel does the Mitsubishi S4S use?
The Mitsubishi S4S is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S4S?
The Mitsubishi S4S is an inline-4 (4-cylinder) engine with a displacement of 3.331 L.
What emissions standard does the S4S meet?
The Mitsubishi S4S is certified to U.S. EPA Tier 3 / U.S. EPA Interim Tier 4 emissions standards.
Is the Mitsubishi S4S still in production?
Yes — the Mitsubishi S4S is a current production model.
Is a datasheet available for the S4S?
Yes — an official Mitsubishi datasheet for the Mitsubishi S4S can be downloaded from this page.
Reference
- Canonical page
- /engines/mitsubishi-s4s
- Last database update
- 2026-07-25
- Manufacturer files
- 2 datasheets linked
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