Abstract: An insert that can be positioned in a gap between a first front face of a cylinder liner, the first front face facing a cylinder head, and a second front face of the cylinder head, the second front face facing the cylinder liner. The insert includes at least one compressible material.

Abstract: A method for operating an engine is disclosed. The method may include supplying the engine with gas. The method may also include supplying the engine with hydrogen from a hydrogen source. Further the method may include charging a combustion chamber of the engine with a first amount of loaded gas, which may include a gas air mixture. The method may also include delivering, to the combustion chamber, a second amount of hydrogen. The second amount may be a predetermined fraction X of the first amount. The predetermined fraction may be selected to achieve a predetermined ratio ? of an actual amount of the air in the combustion chamber and a stoichiometric amount of the air in the combustion chamber. The hydrogen and the loaded gas may form a loaded gas mixture in the combustion chamber. The method may also include igniting the loaded gas mixture in the combustion chamber.

Abstract: A spark-ignited gas engine includes a combustion chamber, a compressor, an exhaust gas duct, and a thermal reformer. The compressor is driven electrically by a motor and configured to load the combustion chamber with an air-gas-mixture. The thermal reformer is connected to at least a part of the exhaust gas duct to receive heat from the exhaust gas duct. The thermal reformer is configured to convert higher HCs to hydrogen (H2). The higher HCs includes n carbon atoms and m hydrogen atoms according to at least one of the following reactions: —CnHm+nH2O<<->>(m/2+n)H2+nCO, —CnHm+(n/2)O2<<->>(m/2)H2+nCO, and —CnHm+nCO2<<->>(m/2)H2+2nCO.

Abstract: An insert that can be positioned in a gap between a first front face of a cylinder liner, the first front face facing a cylinder head, and a second front face of the cylinder head, the second front face facing the cylinder liner. The insert includes at least one compressible material.