An internal combustion engine arrangement comprising an engine cylinder and a piston positioned for reciprocal movement in the engine cylinder along a central axis (A) 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 (A), and the floor portion defining a minimum level of said piston bowl surface along the central axis (A), the piston bowl having a piston bowl extension (Dmax) along said central axis (A) 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 (A), 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 (N) to the reflection surface is directed towards a central axis (A) of the piston, and forming an angle (β') being a constant angle ± 2° with said central axis (A), wherein said constant angle is at least 50°, and wherein said fuel spray vector forms a spray angle (β) with said central axis (A), 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 (A), and the floor portion defining a minimum level of said piston bowl surface along the central axis (A), the piston bowl having a piston bowl extension (Dmax) along said central axis (A) 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 (A), 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 (N) to the reflection surface is directed towards a central axis (A) of the piston, and forming an angle (β') being a constant angle ± 2° with said central axis (A), wherein said constant angle is at least 50°, and wherein said fuel spray vector forms a spray angle (β) with said central axis (A), said constant angle (β') being at least 2°, preferably at least 5°, smaller than said spray angle (β). <EOS>