A combustion chamber for an opposed-piston engine has a rotationally skewed shape in a longitudinal section that is orthogonal to a chamber centerline, between diametrically-opposed openings of the combustion chamber through which fuel is injected. The rotationally skewed shape interacts with swirl to generate a tumble bulk charge air motion structure that increases turbulence.

An engine includes a combustion chamber including a cylinder wall defining a cylinder, a fuel injector disposed in a first opening in the cylinder wall and a piston head disposed in the cylinder. A piston bowl at least partially defined by a wall having a generally spiral shape is provided in a top of the piston head.

A combustion chamber for an opposed-piston engine has a rotationally skewed shape in a longitudinal section that is orthogonal to a chamber centerline, between diametrically-opposed openings of the combustion chamber through which fuel is injected. The rotationally skewed shape interacts with swirl to generate a tumble bulk charge air motion structure that increases turbulence.

The present invention relates to an internal combustion engine with hydrogen direct injection. The engine derives from a traditional diesel cycle engine but is modified and optimized to be powered by hydrogen. Some main characteristics of the injection, ignition and combustion systems of direct fuel injection engines are modified. In particular: the piston and specifically the combustion chamber, the lay-out of the injector and the lay-out of the spark plug. The invention is applicable to various types of engines with different bores, cylinder head arrangement, rotation speeds and type of mission. The components can be customized accordingly, while maintaining the commonalities with the corresponding components of traditional diesel engines.