Connecting rod lubrication apparatus

An apparatus comprising:

• an elongated connecting rod extending from a first end to a second end along a central longitudinal axis;
• a pin defining a rotation axis that is transversely oriented to the central longitudinal axis, the pin coupling the connecting rod to a piston at the first end of the connecting rod, wherein the connecting rod includes a surface that extends around and faces the pin and the rotation axis, the surface comprising:
• opposite first and second edges spaced from one another along the rotation axis, the first and second edges defining a width therebetween;
• a first transverse groove portion extending generally along the rotation axis substantially across the width of the surface, wherein the first transverse groove portion is offset to a first side of the central longitudinal axis when viewed in a direction along the rotation axis;
• a second transverse groove portion extending generally along the rotation axis substantially across the width of the surface, wherein the second transverse groove portion is offset to a second side of the central longitudinal axis that is opposite the first side when viewed in the direction along the rotation axis;
• and
• at least one inner circumferential groove portion connected to and in fluid communication with the first transverse groove portion and the second transverse groove portion, the at least one inner circumferential groove portion being spaced from and extending parallel to the adjacent edges at least 180 degrees around the rotation axis between the first and second transverse groove portions.