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Rolls-Royce / Bergen
12VB36:45DF
The Rolls‑Royce/Bergen 12VB36:45DF is a medium‑speed V‑12 dual‑fuel (LNG/HFO) marine engine delivering 6,240 kW at 720 rpm with lean‑burn spark‑ignition and low NOx emissions.
6240.0 kW
Power
Engine Specifications
12
Cylinders
360 mm
Bore
450 mm
Stroke
4-stroke
Stroke Type
Components & Design
Component data being added…
Technical Data
Ignition System
Spark-ignition lean-burn Otto cycle with individual cylinder pressure monitoring (CPM)
Turbocharger Type
Variable Turbine Geometry (VTG) with wastegate
Fuel Injection
Port injection with Variable Valve Timing (VVT)
Specific Energy Consumption (B36:45)
7,300 kJ/kWh mechanical ISO with engine-driven pumps
Lubricating Oil Consumption
< 0.4 g/kWh
NOx Emissions
500 mg/Nm³ @ 5% O₂
Electrical Efficiency
48.6% (B35:40V20); 48.5-48.9% (B36:45 series)
Cylinder Power Output
438 kW/cyl (B35:40); 600 kW/cyl (B36:45)
Dry Weight Examples
B35:40V12AG: 10,600 kg; B35:40V20AG: 13,100 kg
GHG vs Diesel
22% lower greenhouse gas emissions
power kw
6240
rpm
720
fuel type
LNG/HFO (Dual-Fuel)
configuration
V
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Common failures & inspection points
Methane slip in exhaust (100-3000+ ppm typical for lean-burn SI engines; Bergen designed B36:45 to minimize)
Piston ring carbon deposits at TDC zone from high combustion temperatures in lean-burn operation
Turbocharger compressor wheel blade erosion and FOD (foreign object damage) requiring visual borescope inspection
Fuel solenoid cut-off valve sticking or seal degradation (safety-critical for spark-ignited marine engines)
Cooling water system corrosion from improper jacket water chemistry (pH, conductance, chloride, iron content critical)
Type-general inspection and maintenance points for this equipment category — not model-specific.
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Equipment Model #124124
· ✓ still in production