two-spring injection-nozzle with needle-displacement sensor low fuel injection (the valve needle is lifted against the weak spring # 1) high fuel injection (the valve needle is lifted against stiff spring # 2) the needle-displacement sensor senses start of injection description ordernumber 291 see also: common-rail injector II volume controlling unit (in-line injection pump) primary pressure regulation KE-Jetronic dual-stage charging (twin turbo)