Wärtsilä
8V31
Guinness World Record holder as the world's most efficient 4-stroke diesel engine. Designed for both propulsion and power generation.
4480.0 kW
Power
Engine Specifications
8
Cylinders
310 mm
Bore
430 mm
Stroke
4,480 kW
MCR Power
750.0 rpm
MCR RPM
165.0 g/kWh
SFC
4-stroke
Stroke Type
Family: Wartsila Wartsila 31
· Tier: IMO Tier II
· Brennstoff: HFO, MDO
⚙️ Weitere Zylinder-Konfigurationen 3
🔧 Komponenten & Aufbau 4
Fuel Pump (Jerk-Type / Common Rail)
Wartsila / L'Orange
W31 Common Rail Injection Unit
common failures:
['Rail pressure regulator drift', 'Injector nozzle erosion from high injection pressure', 'HP pump plunger wear', 'Fuel leakage at rail connections']
source family:
Wartsila 31
💡 Common rail pressure up to 2200 bar. Rail and injector overhaul at 12,000 hrs. Monitor rail pressure stability.
Lead time: 8 Wo.
Dual-Fuel System (Gas Mode)
Wartsila
W31 Pilot Fuel System (DF variant)
common failures:
['Pilot injector nozzle clogging', 'Pilot fuel quantity control drift', 'Pilot fuel pump seal leakage']
source family:
Wartsila 31
💡 Micro-pilot diesel injection for gas mode ignition. Pilot fuel consumption <1% of total energy. Overhaul pilot injector at 8,000 hrs.
Lead time: 6 Wo.
Dual-Fuel System (Gas Mode)
Wartsila
W31 Gas Admission Valve (GAV)
common failures:
['Valve seat wear causing gas leakage', 'Actuator response time degradation', 'Seal failure causing gas bypass']
source family:
Wartsila 31
💡 Low-pressure gas admission valve per cylinder. Overhaul at 12,000 hrs. Leak test after every overhaul.
Lead time: 6 Wo.
Dual-Fuel System (Gas Mode)
Wartsila
W31 Pre-Chamber Assembly (DF)
common failures:
['Pre-chamber fouling from incomplete combustion', 'Flame propagation failure at low load', 'Erosion of pre-chamber orifices']
source family:
Wartsila 31
💡 Pre-chamber ensures stable ignition of lean gas-air mixture. Inspect at 8,000 hrs. Replace inserts at 16,000 hrs.
Lead time: 6 Wo.
📊 Technische Daten
Cylinder power
610 kW/cyl (diesel)
Mean effective pressure (BMEP)
30 bar
SFOC (diesel)
167.7 g/kWh (optimal point)
Weight (8V31)
~57.1 tonnes (dry, diesel)
Weight (16V31)
~89–92.5 tonnes (dry, diesel)
Piston speed
10.75 m/s
Turbocharging
Two-stage turbocharging with intercooling
Fuel injection
Common rail direct injection
Valve layout
2 inlet, 2 exhaust valves per cylinder
unified from engine model
True
bore mm v
310
stroke mm v
430
rpm v
720, 750
fuel v
Diesel (HFO, MDO, LFO), Dual-Fuel LNG/Diesel (W31DF), Natural Gas (W31SG)
status v
In production (2024–present). First introduced 2015. Over 1,000 MW installed globally and >1 million running hours logged.
datasheet url
https://www.wartsila.com/docs/default-source/product-files/engines/ms-engine/product-guide-w31.pdf (W31 diesel) + https://www.wartsila.com/docs/default-source/product-files/engines/df-engine/product-guide-w31df.pdf (W31DF)
⚠️ Typische Ausfälle
- ● _hinweis
- ● items
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Spare parts data being added…
Equipment-Model #38952
· ✓ still in production