Patent ID: 8627803

Claim:
An engine assembly comprising: a boost mechanism in communication with an air source; an engine structure defining a first cylinder bore, a second cylinder bore, a first intake port in communication with the boost mechanism and in communication with the first cylinder bore so as to only receive intake air from the boost mechanism during operation of the engine assembly, and a second intake port in communication with the air source and the second cylinder bore and wherein the second cylinder bore is isolated from the boost mechanism; a first intake valve located in the first intake port; a first valve lift mechanism engaged with the first intake valve; a second intake valve located in the second intake port; and a second valve lift mechanism engaged with the second intake valve and operable in first and second modes, the second intake valve being displaced to an open position by the second valve lift mechanism during the first mode and the second intake valve being maintained in a closed position by the second valve lift mechanism during the second mode.