Internal combustion engine

An internal combustion engine for use with hydrogen fuel,

• the engine having at least one cylinder assembly, each cylinder assembly comprising:
• a combustion chamber comprising a cylinder, a cylinder head and a reciprocating piston assembly;
• two inlet ports within the cylinder head, the inlet ports being selectively closable by a corresponding inlet valve;
• two outlet ports within the cylinder head, the outlet ports being selectively closable by a corresponding outlet valve;
• and
• at least one spark plug mounted to the cylinder head;
• a fuel injector arranged to inject hydrogen fuel through the cylinder head at an injection point;
• wherein the cylinder head comprises a first face and a second face inclined relative to one another and meeting at an apex, the two inlet ports being located within the first face and each outlet port being located within the second face such that each inlet port is configured to generate a tumbling motion of the fuel air mixture prior to ignition thereof and wherein the cylinder head is secured by six fasteners, and
• wherein the spark plug is located in a region intermediate the inlet and outlet ports.