An internal combustion engine arrangement comprising an engine cylinder and a piston positioned for reciprocal movement in the engine cylinder along a central axis between a bottom dead center position and a top dead center position, wherein the piston comprises a piston crown having a piston bowl surface adapted for facing a combustion chamber in said cylinder, wherein said piston crown is arranged in relation to an injector of said combustion engine arrangement, said injector comprising at least one orifice, said orifice being arranged to inject fuel along a fuel spray vector towards a spray impingement portion, wherein the piston bowl surface comprising: a circumferential rim portion, a floor portion connected to and surrounded by said circumferential rim portion a plurality of circumferentially spaced protrusions in the circumferential rim portion, at least one spray impingement portion, located between two adjacent protrusions, wherein the spray impingement portion comprises a reflection surface, wherein the rim portion defines a maximum level of said piston bowl surface along the central axis, and the floor portion defining a minimum level of said piston bowl surface along the central axis, the piston bowl having a piston bowl extension (Dmax) along said central axis being the difference between said maximum level and said minimum level, and wherein said reflection surface has a reflection surface extension (Da) along the central axis, the reflection surface extension (Da) being at least 10 % of said piston bowl extension (Dmax), preferably at least 15% of said piston bowl extension (Dmax), characterized in that the reflection surface of the spray impingement portion substantially has the shape of a portion of an envelope surface of an imaginary cone, being defined by that each possible normal to the reflection surface is directed towards a central axis of the piston, and forming an angle (β') being a constant angle ± 2° with said central axis, wherein said constant angle is at least 50°, and wherein said fuel spray vector forms a spray angle (β) with said central axis, said constant angle (β') being at least 2°, preferably at least 5°, smaller than said spray angle (β). a circumferential rim portion, a floor portion connected to and surrounded by said circumferential rim portion a plurality of circumferentially spaced protrusions in the circumferential rim portion, at least one spray impingement portion, located between two adjacent protrusions, wherein the spray impingement portion comprises a reflection surface, wherein the rim portion defines a maximum level of said piston bowl surface along the central axis, and the floor portion defining a minimum level of said piston bowl surface along the central axis, the piston bowl having a piston bowl extension (Dmax) along said central axis being the difference between said maximum level and said minimum level, and wherein said reflection surface has a reflection surface extension (Da) along the central axis, the reflection surface extension (Da) being at least 10 % of said piston bowl extension (Dmax), preferably at least 15% of said piston bowl extension (Dmax), characterized in that the reflection surface of the spray impingement portion substantially has the shape of a portion of an envelope surface of an imaginary cone, being defined by that each possible normal to the reflection surface is directed towards a central axis of the piston, and forming an angle (β') being a constant angle ± 2° with said central axis, wherein said constant angle is at least 50°, and wherein said fuel spray vector forms a spray angle (β) with said central axis, said constant angle (β') being at least 2°, preferably at least 5°, smaller than said spray angle (β).