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Rolls-Royce / Bergen
9LB35:40-GS-60Hz
The Bergen B35:40V auxiliary engine (9LB35:40‑GS‑60Hz) is a high‑speed, dual‑fuel (HFO/MDO and natural gas) spark‑ignition generator set delivering up to 4 360 kW electrical power at 60 Hz, noted for its lean‑burn efficiency and low emissions.
4590.0 kW
Power
Engine Specifications
9
Cylinders
350 mm
Bore
400 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
4590
rpm
900
fuel type
HFO/MDO
configuration
L
genset kw
4360
genset kva
5450
frequency hz
60
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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.
Suppliers & Spare Parts
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Equipment Model #125249
· ✓ still in production