New Features of Engines N73, N73TU E65, E66

11 01 03 (022)
New features of engines N73, N73TU
E65, E66

Introduction
This document lists the new features of the previous N73 engine by subsystem.
In 09/06, the N73 engine was modified.
The N73TU satisfies the legal emissions levels, e.g. Euro 4 standard for Europe or LEV II for the USA (LEV: Low Emission Vehicle).
Attention is drawn to the differences between the two engines (N73 and N73TU).

Overview of subsystems
The new features are divided into the following subsystems:





Direct fuel injection - E65, E66/N73/N73TU
(SBT 13 01 03 023) Direct Injection E65, E66 N73/N73TU

With the N73B60 engine, direct injection technology is used for the first time on a BMW spark-ignition engine. Direct injection means that the fuel is injected under high pressure directly into the combustion chamber.





Fuel supply system E65, E66/N73/N73TU
(SBT 16 01 03 024) Fuel System E65, E66 N73/N73TU

The fuel system (of the N62 engine) has been slightly modified for the E65 with N73 engine to adapt it to the new direct injection system.





Engine management
MED 9.2.1 and MED 9.2.2 E65, E66/N73/N73TU
(SBT 12 01 03 033) Engine Management Status MED 9.2.1/MED 9.2.2 E65, E66 N73/N73TU

The MED 9.2.1 engine management system (engine electronics direct injection) is based on the ME 9.2 engine electronics.
> N73TU from 09/06
The MED 9.2.2 engine management system will be introduced with the introduction of the modified N73 engine. This engine management system is based on the ME 9.2.1 engine electronics.





Fresh air system - E65, E66/N73/N73TU
(SBT 11 02 03 038) Fresh Air System E65, E66 N73/N73TU

The fresh air system of the N62 engine has been adapted for the N73 engine.





Exhaust system - E65, E66/N73/N73TU
(SBT 11 03 03 039) Description and Operation

The exhaust system of the current N62 engine has been adapted for the N73 engine.

Subject to alteration due to misprints, errors and technical modifications.