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N55 Engine
Engine Designation and Engine Identification
Engine Designation
This training material describes the N55B30M0 in detail.
In the technical documentation, the engine designation is used for unique identification of
the engine. In the technical documentation you will also find the abbreviated engine des-
ignation, i.e. N55, that only indicates the engine type.
Item Meaning Index / explanation
1 Engine developer
M, N = BMW Group
P = BMW Motorsport
S = BMW M mbH
W = Non-BMW engines
2 Engine type
1 = R4 (e.g. N12)
4 = R4 (e.g. N43)
5 = R6 (e.g. N55)
6 = V8 (e.g. N63)
7 = V12 (e.g. N73)
8 = V10 (e.g. S85)
3 Change to the basic engine concept
0 = basic engine
1 – 9 = changes, e.g. combustion process
4
Working method or fuel type and
possibly installation position
B = Gasoline, longitudinal installation
D = Diesel, longitudinal installation
H = Hydrogen
5 Displacement in liters 1 = 1 liter (whole number of liters)
6 Displacement in 1/10 liter 8 = 0.8 liter (tenth of liter)
7 Performance class
K = Smallest
U = Lower
M = Middle
O = Upper (standard)
T = Top
S = Super
8 Revision relevant to approval
0 = New development
1 – 9 = Revision
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