Combustion bowl of piston

A compression ignition internal combustion engine comprising:

• a cylinder block defining a plurality of cylinders disposed therein;
• a cylinder head mounted on the cylinder block;
• a piston configured to reciprocate within the cylinder block, the piston including:
• a piston body including an outer cylindrical surface defined along a longitudinal piston axis, the outer cylindrical surface having a first axial piston end, and a second axial piston end;
• a combustion face provided at the second axial piston end, the combustion face defining a combustion bowl having an inner bowl surface, an inner rim portion and an outer rim portion;
• and
• a cross-sectional profile of the combustion face including a profile of rotation about the longitudinal piston axis, the profile of rotation of the combustion face including:
• a first profile including a convex curve segment corresponding to the inner bowl surface and being bisected by the longitudinal piston axis, a linear curve segment outboard the convex curve segment, and a first set of concave curve segments outboard the linear curve segments and corresponding to the inner rim portion, the first set of concave curve segments defining a first radius of curvature;
• and
• a second profile outboard the first profile including a second set of concave curve segments corresponding to the outer rim portion and defining a second radius of curvature greater than the first radius of curvature of the first set of concave curve segments;
• the second set of concave curve segments and the first set of concave curve segments connected at a non-reentrant transition, the non-reentrant transition disposed vertically below the convex curve segment;
• and
• a fuel injector having an upper set of fuel injector orifices and a lower set of fuel injector orifices and configured to inject a fuel spray beam at a first angle and a second angle to the outer rim portion and the inner rim portion respectively.

A combustion face of a piston for a compression ignition internal combustion engine, the combustion face comprising;

• a combustion bowl having an inner bowl surface, an inner rim portion and an outer rim portion;
• and
• a cross-sectional profile having a profile of rotation about a longitudinal piston axis, the profile of rotation including:
• a first profile including a convex curve segment corresponding to the inner bowl surface and being bisected by the longitudinal piston axis, a linear curve segment outboard the convex curve segment, and a first set of concave curve segments outboard the linear curve segments and corresponding to the inner rim portion, the first set of concave curve segments defining a first radius of curvature;
• and
• a second profile outboard the first profile including a second set of concave curve segments corresponding to the outer rim portion and defining a second radius of curvature greater than the first radius of curvature of the first set of concave curve segments,
• the second set of concave curve segments and the first set of concave curve segments connected at a non-reentrant transition, the non-reentrant transition disposed vertically below the convex curve segment.