Turbocharger And Exhaust Manifold - Detroit Diesel MBE 900 Technician Manual

PRELIMINARY MBE EGR TECHNICIAN'S GUIDE
2.1.1

TURBOCHARGER AND EXHAUST MANIFOLD

The turbocharger used on the MBE 4000 engine features an asymmetrically split double-flow
turbine housing. The exhaust flow of cylinders No. 1 through 3 is collected in a manifold separate
from cylinders No. 4 through 6, with the flow from each manifold entering the turbine housing
through separate inlets having different flow areas. The smaller inlet causes higher exhaust
back pressure providing the required level of pressure to drive EGR. The turbocharger design
must accommodate operations at elevated compressor wheel speeds because of the need to flow
EGR. See Figure 2-5.
Figure 2-5 Cross Section of MBE 4000 Exhaust Manifold with EGR
Due to the compressor characteristics, it is not possible to use EGR at low engine speeds.
2-9
All information subject to change without notice. (Rev. 5/05)
7SE940 0505 Copyright © 2005 DETROIT DIESEL CORPORATION