US Patent 7198020 Lubrication systems and methods for an internal combustion engine

A lubrication system for an internal combustion engine a lubricant source, a first lubricant passage that conducts lubricant from the lubricant source to a portion of the engine beneath the piston, and a second lubricant passage that conducts lubricant a space above the piston. The first lubricant passage may include a spray nozzle that sprays lubricant onto a crankshaft bearing and/or onto a wall of the cylinder. The second lubricant passage may conduct airborne lubricant from a crankcase of the engine to the space above the piston.