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Rolls-Royce / Bergen

12VB35:40

Bergen B-Gas (Rolls-Royce/Bergen Engines - Langley Holdings) — Marinediesel, Bohrung 350 (B35:40); 360 (B36:45) x Hub 400 (B35:40); 450 (B36:45) mm, 750 rpm, B35:40: 2,628-8,760 kW (6-20 cylinders); B36:45: 3,600-12,000+ kW. Brennstoff: Natural Gas; Methane number > 80, LHV 36 MJ/Nm³. Status: Production (Langley Holdings ownership since Jan 2022); B36:45 series launched 2018. Verifiziert, Datenblatt verlinkt.

6240.0 kW
Power

Engine Specifications

12
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 6240
rpm 720
fuel type HFO/MDO
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)
www.rolls-royce.com/media/press-rel...
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
www.marineinsight.com/how-variable-...
Fuel solenoid cut-off valve sticking or seal degradation (safety-critical for spark-ignited marine engines)
www.manualslib.com/manual/1458843/B...
Cooling water system corrosion from improper jacket water chemistry (pH, conductance, chloride, iron content critical)
www.manualslib.com/manual/1458843/B...

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #123931 · ✓ still in production