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Explanation for all Notations used by MAN B&W engines

This article will provide explanation for all Notations used by MAN B&W engines till date.


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 and 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 applicationS – 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

7L80GB/E
7 – Number of cylinders
L – Long stroke
80 – Cylinder diameter in cm
G – Engine Model/Hydraulically Operated Exhaust Valve
B – Engine rating
E – Economy layout

7S80MC
7 – Number of cylindersS – Super long stroke80 – Cylinder Diameter in cmMC – 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)


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