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diminished horespower in rebuilds
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I have spent a couple of hours searching but I can't find it again. <br /> <br />A year or so ago I came across a web page for a company that converts 20 cyl 645s to 16 cyl. They had a very nice page with pictures of the various steps and descriptions of everything. <br /> <br />"Blocking off" four cylinders, if ever done, wouldn't be as easy as it sounds, and may not be an improvement. You would still have friction of the mechanical parts and the pistons would be pumping air even if the valves were blocked open or removed and the manifolds were removed. <br /> <br />Using a cylinder as an air compressor is common in marine applications where it is also used as the starter. The engines run either direction so to reverse it is stopped at started running the other way. If you are around an old ferry or tug when it is changing directions and you hear a whoosing of air just as the engine starts that is what is going on. <br /> <br />Wouldn't work in a railroad application as the water around the prop acts a fluid coupling/clutch which would have to be another component in a loco. Diesel-hydraulic anyone?
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