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It isnt about beefy bottom ends, its about rotating mass. How fast can you swing an empty bucket? Now try it full. there isnt any bottom end beefier than this one, http://gcaptain.com/maritime/blog/emma-maersk-engine/the-worlds-largest-marine-diesel and look at its R-limit! (102 rpm for those...

And nobody seemed to remember that it was built by the lowest bidder! Or that long stroke engines inherently have a lower max RPM. There are marine diesels out there that have a red-line of 60 RPM. And the cross section of the crown of that piston is way smaller than it is through the rod...