 For example, the classes for "Racing Cars" (i.e.single-seaters) are divided into those for cars with engine capacities of under 600cc, 600–1100 cc, 1100–1600 cc, 1600–2000 cc and over 2000 cc.The cars in the unlimited capacity class often use engines from, or derived from, Formula One cars, and occasionally F1 cars themselves have competed.