A Double- Acting Scotch Yoke (DASY) assembly (12) includes a first yoke (22); a second yoke (24) attached to the first yoke (22) at a first flat-to-flat interface (35, 35); a first piston (18) attached to the first yoke (22) at a second flat-to-flat interface (54, 67); and a second, opposing piston (28) attached to the second yoke (24) at a third flat-to-flat interface (54, 67). The planes of all of the flat-to-flat interfaces are perpendicular to a common, center axis (33) of the first and second pistons (18, 28). An X-engine crank train (10, 100, 200) includes a plurality of DASY assemblies (12).
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