A PRE-CHAMBER ARRANGEMENT FOR A GAS ENGINE AND A GAS ENGINE

A pre-chamber arrangement () for a gas engine (), including a pre-chamber body () accommodating a volume (); and an inlet passage () with an inlet port (), for supplying a gaseous medium () into the pre-chamber volume (); the pre-chamber volume () extends in a longitudinal direction () between a top end () and a bottom end (); the pre-chamber volume () is configured to accommodate an end of a spark plug () at the top end () and at the bottom end (), the pre-chamber body () has openings () for allowing gas to flow between the pre-chamber volume () and a main combustion chamber () of the gas engine (); the inlet port () is positioned, at a distance (D) from the top end () of the pre-chamber volume (), in the longitudinal direction (L), such that a volume of residual gases is trapped at the top end of the pre-chamber volume when the gaseous medium is supplied into the pre-chamber volume during an intake stroke.