Patent ID: 7032566

Claim:
A direct fuel injection combustion chamber assembly, comprising: a combustion chamber; a piston forming a moving end wall of the combustion chamber; and a fuel injector having a nozzle tip communicating directly with the combustion chamber, the nozzle tip including, an outer nozzle tip surface portion, an inner nozzle tip surface portion, a plurality of passages, including a first group and a second group, allowing fluid communication between the inner nozzle tip surface portion and the outer nozzle tip surface portion and directly into the combustion chamber, each of the plurality of passages having an inner surface aperture on the inner nozzle tip surface portion and an outer surface aperture on the outer nozzle tip surface portion, and each of the passages having a longitudinal axis that extends into the piston at a piston position of approximately 30 degrees before top dead center each of the inner surface apertures of the first group being spaced apart from each of the inner surface apertures of the second group with respect to a longitudinal axis of the combustion chamber.