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I retyped my post about rod ratios, I rearanged the paragraphs, and described a little more completely, I hope it makes sense. <br /> <br />I have been reading "Diesel's engine" by lyle Cummins, and it says that the original licencees of Diesel very quickly did away with the crosshead of Diesel's original design because of knocking during load reversal in the connecting rod. They addressed the problem of thrust wear by improving piston/bore tolerances. I have read about ultra long stroke engines at the web site for Wartsila diesel, although it was quite a while ago. It was in the company history, where it said crossheads made a comeback in the 1950's for the benefit of ultra long stroke. <br /> <br />So, what does this have to do with railroad locomotives? Well it was first asked what is different about locomotive engines? Then it was asked, "Well, what is different about other engines?", "what about marine engines?" Then it was pointed out that marine engines were too tall for use in locomotives, but it was not explained how there are deeper reasons for this difference in "hight" between marine and locomotive engines, and explaining this might give insight into not just marine or locomotive engines, but all engines.
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