MARINE DIESEL ENGINES NOTATIONS

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There has been too much puzzle with regards to the notations used for the Marine Diesel Engines. One can consult the engine manual & find out what such notations means.

However, this article will provide explanation for all the Notations used by the MAN B&W engines till date.

What has been collected will continuously be updated whenever there is a change or a new addition to the notations.

MAN – Germany – Maschinenfabrik Augsburg Nurnberg,

B&W – Denmark – Burmeister & Wain Motorfabrik A/S

The merger of above two Giants is now known as Man B&W.

Now, with some examples of engine name plate details & specifications, we will understand these notations. From the 1960s to present.

MAN B&W ENGINE Specifications:

774VT2BF(S)

7 – Number of cylinders

74 – Cylinder diameter in cm

V – Single acting 2-stroke

T – Cross Head

2B – Degree of Turbocharging

F – Marine application S – Stationary Application

7K74EF

7 – Number of cylinders

K – Two stroke cross head

74 – Cylinder diameter in cm

E/G – Engine model/Hydraulically Operated Exhaust Valve

F – Marine application

7L80GFCA

7 – Number of cylinders

L – Long stroke

80 – Cylinder diameter in cm

G – Engine model/Hydraulically Operated Exhaust Valve

F – Marine Application

C – Constant pressure turbocharging

A – Engine rating

7L80GFCA

7 – Number of cylinders

L – Long stroke

80 – Cylinder diameter in cm

G – Engine model/Hydraulically Operated Exhaust Valve

F – Marine Application

C – Constant pressure turbocharging

A – Engine rating

7S80MC

7 – Number of cylinders

S – Super long stroke

80 – Cylinder Diameter in cm

MC – Engine model/Programme

6K90MC-C/S

6 – Number of cylinders

K – Two stroke cross head

90 – Cylinder diameter in cm

MC – Engine model/Programme-

C – Short stroke container ship application-

S – Stationary Application

5L60MC MK-5

5- Number of cylinders

L – Long stroke

60 – Diameter of cylinder in cm

MC – Engine Programme

MK 5 – Engine version/Mark Number

6S90ME-C 9 GI TII

6 – Number of cylinders

S – Stroke/bore ratio – (G – ‘Green’ Ultra long stroke, S – Super long stroke,

L – Long stroke, K – short stroke)

90 – Diameter of the Cylinder in mm

M – Engine programme series

E – Concept – (E – Electronically controlled, C – Camshaft controlled)

C – Design – (E – Exhaust valve controlled by camshaft, C – Compact engine)

9 – Mark NumberGI – Fuel injection concept – (“blank” – Fuel oil only, GI – Gas injection)TII – Emission regulation – (TII – IMO Tier level)

Stroke/ Bore ratio:

K – Short stroke (approximately ratio = 2.8)

L – Long stroke (approximately ratio = 3.2)

S – Super long stroke (approximately ratio = 3.8)

G – Ultra long stroke (approximately ratio = 4.7)