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Bergen C25:33 generating set

Proven low life-cycle cost for operators.

Reliable power in a compact design

The Rolls-Royce Bergen C-series engine and gensets have a simple and robust design with a reduced number of components. Introduced at 300kW/cyl., it is now rated at 330kW/cyl. and is equally suitable for main propulsion, either with mechanical transmission or in a diesel electric system, or as a marine generating set.


With 6, 8 and 9 cylinders in-line, the C-series has a range of operating speeds from 720rpm to 1,000rpm and can be supplied for powers of 1,920 to 3,000kW.

Key features

  • Extremely stable electrical frequency, important for frequency sensitive equipment
  • Low vibration/structural noise level due to super-resilient mounting
  • Certified to meet IMO Tier II requirements
  • Competitive fuel and lubricating oil consumption
  • No fuel oil leakage into the lubricating oil system due to the Bergen Cofferdam system
  • Single-bearing alternator option for reduced genset length, and reduced cost, through elimination of flexible
  • Coupling between engine and alternator
  • High power to weight ratio
  • The liner, piston, (incl. upper con rod) and cylinder head can be replaced as a single unit without disturbing the big end bearing, saving time and money

Technical data

Engine type C25:33L6A C25:33L8A C25:33L9A
Number of cylinders 6 8 9
Engine speed r/min 900/1000* 900/1000* 900/1000*
Mean piston speed m/s 10/11 10/11 10/11
Max. continuous rating (MCR) kW 1920/2000 2560/2665 2880/3000
Max. continuous rating altern, ( η = 0.96) kW 1843/1920 2457/2558 2764/2880
Max. continuous rating altern, (Cos Ф = 0.8) kVA 2303/2400 3071/3197 3455/3600
Max. continuous rating altern, (Cos Ф = 0.9) kVA 2047/2133 2730/2961 3071/3200
Mean effective pressure (BMEP) bar 26.4/24.7 26.4/24.7 26.4/24.7
Specific fuel consumption g/kWh 182/185 182/185 182/185
Specific lubricating oil consumption g/kWh 0.7 0.7 0.7
Cooling water temp. engine outlet °C 90 90 90


MDO operations Engine** = Engine and foundation Dimensions given apply for resiliently mounted engines. Choice of alternator may affect the given dimensions and weights. All data subject to change without prior notice.

Principle dimensions

Cylinder diameter 250mm. Piston stroke 330mm.
Engine type A B C D E Engine** Weights dry alternator Total
C25:33L6A 3369 4036 7405 2300 3195 28479kg 9900kg 38379kg
C25:33L8A 2838 4796 7634 2304 3261 29150kg 11300kg 40450kg
C25:33L9A 3038 5176 8214 2304 3230 31370kg 12400kg 43770kg


Services and support

  • 24/7 Technical support

    Our 24/7 technical support team is there to help at any time, day or night, wherever your vessel is.


    We understand the importance of having the right parts, available in the right place, at the right time.

  • Training

    Ensure that your crew is properly and thoroughly trained. This will reduce operational risk, downtime and maximise return on asset investment.

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Rolls-Royce Bergen engines