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Hey there Fuzz, FM still builds their opposed piston engines for marine and generating use. I believe that they started out in the marine business. See their corp website http://www.fairbanksmorse.com/engines/commercial/op/op.htm The opposed engine worked kind of like this. Picture the crank shaft in the middle. Above that crank was a set of pistons, which went up and down. The power stroke was down, toward the crank. Basically that portion would look like your typical "in line" engine (ie. like an in-line 6 cyl car engine also called a straight-six.) Now, add in a second set of pistons upside down, under the crank, but connected to the same crank shaft. The upside down set had a power stroke coming up toward the crank. (like another straight-six, but just connected to the bottom of the crank.) Since it was a diesel, you have fuel injection, and then you only need exhaust valves. There is one valve train for the top set of pistons/valves and a second valve train for the lower set of pistons. If you've ever seen a V W engine (flat 4 also called pancake 4, imagine that turned up on its side, so that instead of the pistons moving horizontally, they move vertically. Hope that helps some. - - Stack
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