Within hours, SpaceX officials identified the culprit as a single defective valve, and were able to replace the part because it was easily accessible.

WSJ: SpaceX Acts Fast for New Launch

It's an overhead valve engine with a single camshaft that uses push rods to open and close the 16 valves.

FORBES: The Engine That Could

While the goal of the initiative is to move PC gaming from the desk to the living room, that doesn't necessarily involve a single hardware standard or minimum spec, Valve hardware engineer Jeff Keyzer told Engadget in an interview this morning at CES 2013.

ENGADGET