two-stage turbocharger (bi-turbo) Cutaway are: both turbochargers, control flaps and the fresh-air valve. The turbines and throttle valves can be moved. Exhaust air, fresh air and oil channels are accentuated in colour. description ordernumber 1327 see also: Common-rail high pressure pump with fuel-delivery regulation valve and injector MAN direct injection with bowl-in piston VP 44 (Bosch) radial-piston distributor-type injection pump four-valve cylinder head, diesel direct injection, lorry