Patent ID: 7685991

Claim:
An internal combustion engine having at least one cylinder for slidingly supporting a piston, wherein the cylinder wall of the at least one cylinder of the engine is manufactured to provide a first surface pattern formed thereon for retaining a volume of liquid and a plurality of circumferentially spaced regions having a different pattern with a reduced liquid storage capacity compared to the liquid storage capacity of the first pattern to reduce dilution of lubricating oil with fuel retained in the cylinder, wherein the engine is a diesel engine adapted to provide late injection of fuel into the at least one cylinder of the engine for regenerating an emission control device, said plurality of regions being positioned such that said late injection of fuel into the cylinder impinges against the cylinder wall substantially within said plurality of regions, wherein each cylinder of the engine is provided with a fuel injector nozzle providing a plurality of divergent fuel jets, and wherein the plurality of regions within each cylinder corresponds to the number of divergent fuel jets.