Multi-cylinder opposed piston engines

An opposed piston engine, comprising:

• a spar with a lengthwise dimension, opposing top and bottom portions, and a plurality of through bores transverse to the lengthwise dimension;
• a cylinder liner supported in each through bore, each cylinder liner including an exhaust end with an exhaust port and an inlet end with an inlet port, an external surface, and an internal bore with a longitudinal axis;
• a pair of opposed pistons disposed in the internal bore of each cylinder liner;
• first main bearings mounted lengthwise on the top portion, spaced from first sides of the through bores, and a first crankshaft supported in the first main bearings;
• second main bearings mounted lengthwise on the bottom portion, spaced from second sides of the through bores, and a second crankshaft supported in the second main bearings in a spaced parallel relationship with the first crankshaft;
• the longitudinal axes of the crankshafts lying in a plane that intersects the cylinder liners and that is perpendicular to the axes of the bores in the cylinder liners;
• a first lubricant distribution gallery extending in the top portion with first inlet passages extending through the spar to the first main bearings;
• a second lubricant distribution gallery extending in the bottom portion with second inlet passages extending from the second lubricant distribution gallery through the spar to coolant passages between the through bores and the external surfaces of the cylinder liners and third inlet passages extending from the second lubricant distribution gallery through the spar to the second main bearings;
• and,
• a pumped lubricant source connected to the first and second lubricant distribution galleries.