Like vehicle manufacturing, the engine manufacturing sector is under pressure to maximise economies of scale by using common components and modules. Where vehicle manufacturers look to develop vehicles using a common 'platform' or architecture, engines belong to families, which employ a similar construction. Defining what makes a group of engines a family can be just as subjective as defining platforms, if not more so. To belong to the same family, engines should have common bore centres (similar to hard points on a vehicle's platform). This means there could be diesel and gasoline engines in the same family, for example. They could have different valve train and cylinder configurations and different layouts (in-line or vee). In some instances they could also have different cylinder block materials. This analysis includes engine families data from PwC Autofacts.