Patent ID: 8550051

Claim:
An engine assembly comprising: an engine structure including: an engine block defining a cylinder bore; and a cylinder head coupled to the engine block and defining a first intake port, a second intake port adjacent the first intake port, and a first exhaust port adjacent the first intake port; a piston located within the cylinder bore, the piston, the cylinder head and the cylinder bore defining a combustion chamber including: a first longitudinal end surface defined by the cylinder head and including the first and second intake ports and the first exhaust port; a second longitudinal end surface defined by the piston; and a first protrusion extending longitudinally from one of the first and second longitudinal end surfaces toward the other of the first and second longitudinal end surfaces and extending radially inward from a circumference of the combustion chamber to a location between the first intake port and the first exhaust port and adapted to reduce swirl within the combustion chamber, the other of the first and second longitudinal end surfaces being free from any protrusions, and wherein a longitudinal extent of the first protrusion increases from a radially outermost portion inward; a first intake valve supported by the engine structure and selectively opening and closing the first intake port; a second intake valve supported by the engine structure and selectively opening and closing the second intake port; a first valve lift assembly engaged with the first intake valve; a second valve lift assembly engaged with the second intake valve; and a camshaft assembly rotationally supported by the engine structure and including a first intake lobe engaged with the first valve lift assembly and a second intake lobe engaged with the second valve lift assembly, the first intake lobe rotationally offset from the second intake lobe in a rotational direction of the camshaft assembly.