Heck, it doesn't matter to me either. In fact, I always wonder how anyone knows that their claim is the biggest, etc. The Guinness Book seems to be missing a lot of facts...
Awhile back, someone asked what is the biggest diesel engine, Doc Tinker I think. I couldn't find out with a web search. The biggest I could find was the engine in the QE-II. Recently, there was a program on Hyundai Shipyards. Pretty amazing really, as a company, they make a lot of things, not only ships, but the derricks to load them, the cranes to manufacture them, the diesel engines that go in them. The claim was their 93,000 hp engines are the largest in the world. Anyone want to go there? If you get a chance, watch this program... showing how they forge/mill a crankshaft is pretty amazing in itself.
Matt