FOR SMARTER ENERGY PRODUCTION
VARIABLE SPEED ENGINES
Engines that adapt their speed to the load — less fuel, less noise, longer lifespan
WHAT IS A VARIABLE SPEED ENGINE?
How is it different?
A variable speed engine does not operate at a fixed RPM. Its speed is continuously adjusted by an electronic control unit (ECU) to match the current power demand. This makes it fundamentally more efficient than conventional fixed-speed engines — which run at full fuel consumption and full noise levels even under low load.
ENGINE STRUCTURE
What are the main components?
A variable speed engine is an internal combustion engine designed and tuned for efficient operation across a wide RPM range — typically from approximately 1,500 RPM at low load to 2,500 RPM at peak load.
Main components:
• Variable speed internal combustion engine — diesel or gasoline, optimized for a wide range
• Electronic control unit (ECU) — reads the load in real time and adjusts engine RPM
• Injection system — precisely meters fuel at every RPM
• Integrated cooling and acoustic enclosure — keeps noise levels low even at reduced RPM
ADVANTAGES
Why choose a variable speed engine?
Unlike conventional fixed-speed engines, variable speed engines intelligently adapt to the instantaneous load — consuming less fuel, running quieter, and delivering a longer service life.
✓ 20–40% lower fuel consumption at low load
✓ Quieter operation — lower RPM, lower noise levels
✓ Longer engine life — less wear, less frequent servicing
✓ Lower CO₂ emissions
COMPARISON
Fixed vs. Variable Speed Engine – What’s the difference?
| Feature | Fixed Speed | Variable Speed |
|---|---|---|
| Engine Speed | Constant (3000 rpm) | Adjusts to the load |
| Fuel Consumption | High even at low load | 20–40% lower |
| Noise Level | Consistently high | Quieter at low load |
| Engine Lifespan | 3,000–5,000 operating hours | 10,000–20,000 operating hours |
| Maintenance | More frequent, more component wear | Less frequent, longer service intervals |
| Cost | Lower initial cost | Quick return on investment |
APPLICATIONS
Where variable speed engines excel
Irrigation and Water Pumps
Construction
Mining
Oil and Gas
Variable Speed Engines We Distribute
Scroll horizontally to view the complete table →
| Engine Type | Power (kW) | RPM | Control System | Cooling System | Emissions | Technical Details |
|---|---|---|---|---|---|---|
| 4M06 | 30–58 | 1,800 | Mechanical | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 4M08 | 37–45 | 2,500 | Electronic | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 4M09Stage V Version | 74–105 | 2,200–2,300 | Electronic | Radiator-Cooled | Stage V | Spec Sheet ↗ |
| 4M10 | 60–70 | 2,300 | Mechanical | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 4M11 | 100–120 | 2,200–2,300 | Mechanical | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 4M11Heat Exchanger Version | 75–150 | 2,167 | Mechanical | Heat Exchanger | Unregulated | Spec Sheet ↗ |
| 4M12Stage V Version | 110–147 | 2,200 | Electronic | Radiator-Cooled | Stage V | Spec Sheet ↗ |
| 6M11Heat Exchanger Version | 115–150 | 2,100 | Mechanical | Heat Exchanger | Unregulated | Spec Sheet ↗ |
| 6M11 | 150–180 | 2,200 | Mechanical | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 6M11Stage V Version | 140–190 | 2,000 | Electronic | Radiator-Cooled | Stage V | Spec Sheet ↗ |
| 6M13Stage V Version | 235–257 | 2,100 | Electronic | Radiator-Cooled | Stage V | Spec Sheet ↗ |
| 6M16Heat Exchanger Version | 216–264 | 1,800 | Mechanical | Heat Exchanger | Unregulated | Spec Sheet ↗ |
| 6M16 | 190–255 | 1,800–2,200 | Mechanical | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 6M19Heat Exchanger Version | 288–317 | 1,800 | Mechanical | Heat Exchanger | Unregulated | Spec Sheet ↗ |
| 6M21Heat Exchanger Version | 385–445 | 1,800 | Mechanical / Electronic | Heat Exchanger | Unregulated | Spec Sheet ↗ |
| 6M21 | 350–406 | 1,800–2,200 | Mechanical / Electronic | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 6M33 | 566–670 | 1,800–1,900 | Electronic | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 8M33 | 900 | 1,900 | Electronic | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 12M26 | 780 | 1,800 | Mechanical | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 12M33 | 1,200 | 1,500–1,900 | Electronic | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
| 16M33 | 1,493–1,866 | 1,900 | Electronic | Radiator-Cooled | Unregulated | Spec Sheet ↗ |
Source: Official Baudouin product catalogue. The listed power and RPM values refer to specific catalogue configurations and do not necessarily represent the full operating speed range. Please verify exact technical specifications, emissions compliance and application suitability against the manufacturer's documentation.
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