61
N55 Engine
Exhaust Manifold
The exhaust manifold is air-gap insulated and designed as a six ports into two chamber
manifold. Dividing six exhaust ports into two exhaust chambers is necessary in order to
ensure optimum flow to the twin scroll turbocharger. The exhaust pulses from the first
three cylinders (1-3) feed one scroll (duct 1) of the turbo, while the last three (4-6) feed
the second scroll (duct 2). The exhaust manifold and turbocharger are welded together to
form one component.
N55, attachment of exhaust manifold and turbocharger to engine block
Index Explanation Index Explanation
1
Exhaust manifold
6
Oil return line
2
Vacuum unit
7
Coolant infeed
3
Connection to intercooler
8
Coolant return
4
Oil feed line
9
Shaft, wastegate valve
5
Diverter valve
10
Connection to exhaust system
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