A piston and an internal combustion engine system

A piston for an internal combustion engine, ICE, said piston extending in an axial direction and a radial direction, and having an axial top end comprising a piston bowl intended to form part of a combustion chamber,

• said piston bowl having an axial floor portion with a floor surface and a circumferential rim portion extending in the axial direction between the floor surface and a top end surface of the axial top end,
• said piston bowl further having an axial depth defined by an axial distance between said floor surface and said top end surface,
• said piston bowl further comprising a plurality of spaced-apart protrusions circumferentially distributed around said circumferential rim portion,
• each one of the spaced-apart protrusions extending a substantial part in the radial direction towards a centre axis, and further extending a substantial part in the axial direction from the floor surface towards said top end surface,
• each one of the spaced-apart protrusions having opposite radial side sections, and further a flat surface or concave surface extending between said opposite radial side sections, said flat surface or concave surface having a first circumferential extension at an intersection between said flat surface or concave surface and said floor surface, and further a second circumferential extension at an axial distance from said floor surface, said axial distance being a quarter of said axial depth of the piston bowl, and
• wherein a ratio between the second circumferential extension and the first circumferential extension is 0.4 or less.