Bergen Marine

Bergen Engines AS is a diesel engine manufacturer based in Bergen, Norway, part of Rolls-Royce Power Systems. It makes various ranges of diesel engines for the marine sector. There are three "Bergen" and two Crossley Pielstick ranges with power outputs in the range 1.2MW to 15MW. Formerly part of Rolls-Royce Marine Power Operations, it was merged into Tognum in July 2013,[1] after Tognum had become a 50/50 joint venture between Rolls-Royce and Daimler AG.


The company started as a shipbuilding business called Bergen Mekaniske Verksted (BMV) in 1855 in Bergen, Norway. BMV built both ships and steam engines to propel them. In 1942, BMV established their diesel engine division, but due to World War II a design was not completed before 1946. Engines were delivered in 1946 and -47 to the vessels MS Draupne and MS Arcturus. In 1984 the diesel engine division was spun off into its own company, BMV Maskin AS. It was acquired by Ulstein the following year and renamed Bergen Diesel AS.[2]

In 1999 Ulstein Group was bought out by Vickers plc - Vickers was subsequently acquired by Rolls-Royce the same year. Rolls-Royce proceeded to rename every Ulstein subdivision to Rolls-Royce Marine, with Bergen Diesel being named Rolls-Royce Marine Engines - Bergen.[3]

In March 2011 Rolls-Royce and Daimler launched a takeover for Tognum.[4] The two companies announced on 24 June 2011 that their joint €3.4 billion tender offer had been successful, with 94% of Tognum shareholders accepting.[5] In March 2014 Rolls Royce announced a buyout of the Daimler share of Tognum, which would then be known as Rolls Royce Power Systems.[6]

Engine range

The Bergen marine diesel ranges are denoted by the letters C, B and K and are broadly divided by the power output as follows:

  • Bergen K,
  • Bergen C and;
  • Bergen B32:40

for powers from 1200 – 8,000 kW,

  • Bergen KG 4.2 and;
  • Bergen B35:40

for powers of 1190 kW – 8750 kW.

These engines can all burn Marine Diesel Oil (MDO) and heavy fuel oil (HFO).

They achieve specific fuel consumptions of between 183 and 196g/kWh. Specific lubricant oil consumptions are of the order of 0.8g/kWh.

Two of the Bergen marine engine variants may be fuelled by natural gas.

Bergen K series

The Bergen K marine diesel and gas engines are a range of marine internal combustion engines manufactured by Rolls-Royce plc.

Mechanical configuration

The Bergen K lean burn marine engines with 250mm bore and 300mm stroke is available as a diesel in 6, 8 and 9 cylinder in-line configurations for propulsion and auxiliary duties.


  • Rigid crankcase minimises deformations and ensures good main bearing alignment
  • BMEP 20-22 bar (gas engine 18bar)

Power Outputs

The diesel power range is from 1215-2005 kW. Also available as a gas engine for powers from 1190 – 3970 kW the Bergen K-G4 lean burn gas engine is the result of careful development based on the Bergen K.

Fuels and Consumption

  • Lub oil consumption approx 0.8g/kWh
  • Specific fuel consumption 193-196 g/kWh (8060kJ/kWh gas) due to turbocharger design and modern fuel injection technology

The lean burn principle of the K-G4 gas engines operation combines high power and high efficiency coupled with reduced exhaust emissions, and delivers a specific fuel consumption of 7990-8060kJ/kWh. Engines in service burn natural gas and also other fuels such as gas derived from landfill and from fermentation of effluents.


Bergen lean burn spark ignition technology was first developed more than fifteen years ago and has proved very popular for power generation on land.

Dry Masses

Bergen K engines have dry masses between 22500 and 30500 kg


These marine diesel and gas engines have design lives of more than 20 years and engines are installed in more than 150 power plants throughout the world.

Bergen K-G4

Also available as a gas engine for powers from 1190 – 3970 kW the Bergen K-G4 lean burn gas engine is the result of development based on the K type diesel and heavy fuel oil engine parent.

Bergen B35:40

The Bergen B Series is a twenty-year-old (est. 1986) marque of reciprocating diesel engines. They serve a wide range of ocean-going vessels and; can be supplied as propulsion units or as generator sets for the provision of electrical power. The range includes in-line and Vee cylinder configurations.

The Bergen B Series Marine Diesels have power outputs in the range 2,545 - 5,300 kilowatts

These engines have a reputation for being "a Rolls Royce product" in terms of quality which is ironic because when they were designed, the company was not part of the Rolls Royce organization.

The Bergen B35:40 gas engine has high power and efficiency in the 720-750 rpm class and, is designed for low emissions of NOx, CO, and UHC combined. It builds on the latest B diesel hardware, specifically redesigned and modified for this gas variant.

Crossley Pielstick range.

Pielstick PA6 STC and PA6B STC Manufactured under licence from SEMT Pielstick (owned by MAN Diesel), these engines are designed and developed specifically to burn heavy residual fuels. The Pielstick PA range of diesels offers cylinder configurations ranging from 6 to 20 and a power range of 1950 to 8910 kW.

SEMT Pielstick PC2.6 & PC2.6B These models are rated for Naval applications to run at 520/600 rpm respectively, with power outputs in the 6 to 15 MW range.


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