May 28, 2018 · The crankshafts may set the limits. By MC01, a frequent commenter on WOLF STREET:. Three engine manufacturers have come to dominate the market for the giant low-speed two-stroke diesel enginesCustom in thePerfectst container ships, bulk carriers, and tankers: MAN SE of Germany, Mitsubishi Heavy Industries of Japan, and Wärtsilä of Finland.