 The F9x is the direct injected Diesel version and also features an 8-valve SOHC configuration, it has swirl generating intake ports to create swirling (vortex) of the aspirated air, and either a torodial- or an elsbett- piston bowl to twist the injected fuel vapour, also to achieve the required air/fuel mixing.The diesel fuel is delivered either by a mechanical injection pump or a common rail fuel injection installation.Applications