MAN B&W have
explained the nomenclature for their large 2-stroke engines as follows:
• The first letter stands for engine stroke – K for short stroke
about 2.8 Stroke/Bore ratio, L for long stroke about 3.2 S/B ratio and S for
super long stroke about 4.0 S/B ratio
• The next letter M denotes the engine programme
• The third letter denotes the type of engine control – C for
camshaft control and E for electronic control
• An additional fourth letter C is added in the case of a compact
version of the engine
As for Sulzer RTA
engines, I had attended a presentation at the works of Sulzer Winterthur in the
1980s when Sulzer introduced their RTA design for the first time. The Chief
Designer presented a paper at the seminar when he disclosed that the characters
RTA were chosen on recommendation of a phonetic expert on the ground that the
combination of characters RTA sounded phonetically very nice!!
difference (jituraj_r) between SMC and LMC: LMC is bigger (taller and broader)
due to larger stroke and crank throw and obviously more powerful than the SMC.
Most other details are quite similar.
Piston diameter or
cylinder bore? (Nick) - The design figure is 90 cm. The actual piston diameter
will be slightly less depending on the clearance allowed but for the sake of
convenience the difference is disregarded. So you may call it cylinder bore or piston
diameter whatever you like - both would be correct.