An air compressor assembly comprising: a cylinder block group having a head deck, the cylinder block group defining an internal cavity, at least a portion of the internal cavity forming a sump, the sump being configured to receive a lubricant such that the lubricant is disposed below a liquid lubricant fill level; a crankshaft rotatably disposed in the interior cavity; a piston kit group having a cylinder and a piston kit, the cylinder being received through the head deck and defining a piston bore, at least one cooling channel being formed about an exterior surface of the cylinder, the piston kit including a piston, a wrist pin and a connecting rod, the piston being slidably received in the piston bore, the wrist pin connecting the piston to a first end of the connecting rod, a second end of the connecting rod being coupled to the crankshaft; and a member associated with the crankshaft, the member moving in the sump such that at least a portion of the member crosses the liquid lubricant fill level as the crankshaft rotates, characterized by the member being adapted to sling the lubricant outwardly from the sump such that a first portion of the slung lubricant collects on at least one of the piston bore and the piston to lubricate an interface between the piston and the cylinder and a second portion of the slung lubricant collects in the at least one cooling channel and moves at least partially around the exterior surface of the cylinder in response to gravitational force exerted thereon to thereby draw heat from the cylinder; wherein the air compressor assembly does not include an additional lubricant pump for pumping the lubricant to lubricate the piston kit group and the crankshaft and wherein the cooling channel comprises one or more helical flow channels or a plurality of flow channels contoured so as to control the flow of lubricant from the exterior surface of the cylinder to the bottom of the internal cavity. a cylinder block group having a head deck, the cylinder block group defining an internal cavity, at least a portion of the internal cavity forming a sump, the sump being configured to receive a lubricant such that the lubricant is disposed below a liquid lubricant fill level; a crankshaft rotatably disposed in the interior cavity; a piston kit group having a cylinder and a piston kit, the cylinder being received through the head deck and defining a piston bore, at least one cooling channel being formed about an exterior surface of the cylinder, the piston kit including a piston, a wrist pin and a connecting rod, the piston being slidably received in the piston bore, the wrist pin connecting the piston to a first end of the connecting rod, a second end of the connecting rod being coupled to the crankshaft; and a member associated with the crankshaft, the member moving in the sump such that at least a portion of the member crosses the liquid lubricant fill level as the crankshaft rotates, characterized by the member being adapted to sling the lubricant outwardly from the sump such that a first portion of the slung lubricant collects on at least one of the piston bore and the piston to lubricate an interface between the piston and the cylinder and a second portion of the slung lubricant collects in the at least one cooling channel and moves at least partially around the exterior surface of the cylinder in response to gravitational force exerted thereon to thereby draw heat from the cylinder; wherein the air compressor assembly does not include an additional lubricant pump for pumping the lubricant to lubricate the piston kit group and the crankshaft and wherein the cooling channel comprises one or more helical flow channels or a plurality of flow channels contoured so as to control the flow of lubricant from the exterior surface of the cylinder to the bottom of the internal cavity.