Wärtsilä 32 vs 34 vs 38 – Overview
The Wärtsilä 32, 34, and 38 engines represent three of the most widely used medium‑speed marine engines in global shipping. Each model serves a different power class and vessel segment, but they share Wärtsilä’s core strengths: high efficiency, fuel flexibility, and robust performance under demanding operating conditions.
This comparison page highlights the key differences in power output, fuel options, applications, and technical characteristics, helping shipowners, engineers, and operators choose the right engine for their vessel or project.
Comparison Table: Wärtsilä 32 vs 34 vs 38
Below is a clear, structured comparison of the three engines.
1. Engine Classification
- Wärtsilä 32 → Medium‑power engine for cargo vessels, offshore ships, ferries
- Wärtsilä 34 → Higher power density, ideal for propulsion & auxiliary power
- Wärtsilä 38 → High‑output engine for tankers, Ro‑Ro, offshore and heavy-duty vessels
2. Power Output Comparison
| Engine | Power Range | Typical RPM | Power Class |
| Wärtsilä 32 | 3,000–6,000 kW | 720–750 rpm | Medium |
| Wärtsilä 34 | 3,000–7,000 kW | 720–750 rpm | Medium–High |
| Wärtsilä 38 | 5,000–10,000 kW | 600–750 rpm | High |
3. Fuel Options
| Engine | Diesel | Dual‑Fuel (DF) | Gas |
| Wärtsilä 32 | ✔ | ✔ | — |
| Wärtsilä 34 | ✔ | ✔ (34DF) | — |
| Wärtsilä 38 | ✔ | ✔ (38DF) | — |
All three engines support dual‑fuel technology, enabling operation on LNG with liquid backup fuel.
4. Applications
| Engine | Typical Vessel Types |
| Wärtsilä 32 | Cargo ships, offshore vessels, ferries |
| Wärtsilä 34 | Ferries, offshore support vessels, propulsion & auxiliary power |
| Wärtsilä 38 | Tankers, Ro‑Ro ships, offshore construction vessels, heavy-duty applications |
5. Key Differences Explained
Wärtsilä 32 – The Global Workhorse
- Most widely used of the three
- Excellent balance of efficiency and power
- Ideal for vessels needing medium power with high reliability
Wärtsilä 34 – Higher Power Density
- More power per cylinder than the 32
- Better fuel efficiency at higher loads
- Popular for vessels needing compact but strong propulsion
Wärtsilä 38 – Heavy-Duty Performance
- Designed for demanding, continuous operation
- Higher displacement and torque
- Best suited for large vessels and high-load profiles
6. Technical Summary Table
| Feature | Wärtsilä 32 | Wärtsilä 34 | Wärtsilä 38 |
| Power Output | 3–6 MW | 3–7 MW | 5–10 MW |
| Fuel Options | Diesel, DF | Diesel, DF | Diesel, DF |
| Efficiency | High | Very High | High |
| Emissions | IMO II/III | IMO II/III | IMO II/III |
| Best For | Medium vessels | High‑power medium vessels | Large vessels |
7. Which Engine Should You Choose?
Choose Wärtsilä 32 if:
- You need more power density without moving to a larger engine
- Your vessel is a cargo ship, ferry, or offshore support vessel
Choose Wärtsilä 34 if:
- You need more power density without moving to a larger engine
- You want strong performance in a compact footprint
Choose Wärtsilä 38 if:
- Your vessel requires high continuous power
- You operate tankers, Ro‑Ro ships, or heavy offshore vessels
Engine links
Wärtsilä 32 Engine Page
Wärtsilä 34 Engine Page
Wärtsilä 38 Engine Page