Patent ID: 8714130

Claim:
An integrally cast engine mono-block comprising: integrally cast cylinder block, cylinder head, and portion of a crankcase including crankcase outboard and inboard walls; at least parts of outer and inner bearing bosses integrally cast with the cylinder block; the inner bearing boss integrally cast in the inboard wall; at least one cored out longitudinally extending passage laterally disposed directly between the outboard wall and the cast cylinder block; the passage having an open top end; a lower opening at a lower end of the passage; a crankcase opening of the crankcase at a longitudinally lower end of the mono-block extending from a portion of an outer periphery of a longitudinally lower part of the cylinder block to a bottom portion of the outboard wall of the crankcase; and the lower opening of the passage being located fully laterally inboard of the crankcase opening.