I was looking at one of the new cams last-night which will be going in my engine soon. The lobe layout intrigued me and puzzled me abit - so was hoping someone could explain. Basically, I was looking at the lobes on the exaust cam for cylinder 1-3. The engine has 2x intake valves and 2x exhaust valves for each cylinder - so why are the lobes for the exhaust valves on the same cylinder in different positions? I thought the two exhaust valves would open together, from looking at the cam, it looks like one opens slightly after the other. Is this just the way diesel engines work?