Replacing the Piezo injectors on the engines N63, S63

Not N63 1. revision and S63 1. revision. These engines have solenoid valve injectors. 

The piezo injectors were modified and received the index 11. 

Fig 1: Identifying Piezo Injectors On Engines N63, S63

Courtesy of BMW OF NORTH AMERICA, INC.

Definition of cylinder bank! 

The term cylinder bank (also called bank) designates on the one hand the geometric layout of the cylinders, and on the other hand, the functional allocation of the cylinders to groups with a joint oxygen sensor emissions control (mixture preparation) or joint charge (a turbocharger pro cylinder bank).

For the N63, there is no difference between geometry and function.

N63 Functional and geometric: 

Cylinder bank 1 cylinders 1, 2, 3, 4 and cylinder bank 2 cylinders 5, 6, 7, 8 

For the S63, the functional allocation of the cylinders to a cylinder bank deviating to a geometric layout of the cylinder bank was selected for the optimization of performance:

S63 Functional: 

Cylinder bank 1 cylinders 1, 6, 4, 7 and cylinder bank 2 cylinders 2, 8, 3, 5 

The functional division of the cylinder bank for the S63 frequently requires a higher effort than for the N63, since among others both intake silencer housings must be disassembled in order to e.g. reach all the injectors of (functional) a cylinder bank.