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;
• an inlet runner extending to the inlet ports;
• at least one outlet port within the cylinder head, the at least one outlet port being selectively closable by a corresponding outlet valve;
• at least one spark plug mounted to the cylinder head;
• a fuel injector mounted to the cylinder head and arranged to inject hydrogen fuel into the cylinder via an injection port;
• and
• a piston assembly comprising a piston and a crankshaft;
• a line passing through a center of one of the inlet ports and a center of a corresponding at least one outlet port;
• wherein the line is arranged at a non-zero angle to an axis of rotation of the crankshaft;
• wherein the line is at a non-right angle to the axis of rotation of the crankshaft;
• wherein the cylinder head is secured by six fasteners;
• and
• wherein the injection port is arranged radially outward of the center of each of the inlet ports.