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Wärtsilä
10V31
Guinness World Record holder as the world's most efficient 4-stroke diesel engine. Designed for both propulsion and power generation.
5600.0 kW
Power
Engine Specifications
10
Cylinders
310 mm
Bore
430 mm
Stroke
5,600 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
· Fuel: HFO, MDO
Other Cylinder Configurations 3
Components & Design
Dual-Fuel System (Gas Mode)
Wartsila
W31 Gas Admission Valve (GAV)
Low-pressure gas admission valve per cylinder. Overhaul at 12,000 hrs. Leak test after every overhaul.
Lead time: 6 wk
18.0 kg
Dual-Fuel System (Gas Mode)
Wartsila
W31 Pilot Fuel System (DF variant)
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 wk
35.0 kg
Dual-Fuel System (Gas Mode)
Wartsila
W31 Pre-Chamber Assembly (DF)
Pre-chamber ensures stable ignition of lean gas-air mixture. Inspect at 8,000 hrs. Replace inserts at 16,000 hrs.
Lead time: 6 wk
8.0 kg
Fuel Pump (Jerk-Type / Common Rail)
Wartsila / L'Orange
W31 Common Rail Injection Unit
Common rail pressure up to 2200 bar. Rail and injector overhaul at 12,000 hrs. Monitor rail pressure stability.
Lead time: 8 wk
120.0 kg
Technical Data
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
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Common failures & inspection points
Low-load operation: Poor combustion, carbon deposit accumulation in cylinders, turbocharger fouling, economizer fouling. Wärtsilä offers Slow Steaming Upgrade K
Cylinder liner wear and scuffing (general 4-stroke diesel pattern, not W31-specific): Exacerbated by inadequate lubrication oil film, excessive cylinder tempera
Fuel injection system: Common rail system generally robust; however, HP fuel pump overhaul intervals are extended to 24,000 hrs (vs. 12,000 in prior-gen engines
Scavenge space deposit accumulation and fire risk (class-wide diesel phenomenon): Carbonized lube oil and unburnt fuel residues accumulate in scavenge space. Ex
Type-general inspection and maintenance points for this equipment category — not model-specific.
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Equipment Model #38953
· ✓ still in production