Introduction

BMW is proud to present the new 5.4 liter, 12 cylinder engine. Designated M73, it's design is based on the proven 5.0 liter M70 engine from the previous E32 and E31 models.

The M73 will replace the M70 and be installed in the E38 750iL and the E31 850Ci. In both of these vehicles the 12 cylinder will only be available mated to the ASS 560Z 5 speed automatic transmission currently found in the 8, 7 and 5 series vehicles with the 4.0 liter M60 engine.

The M73 incorporates many technical advancements which allow it to produce more power and torque output while providing improved fuel economy.

Like the M70, the M73 is managed by two separate Motronic Control Systems (one per cylinder bank). Manufactured by Bosch, the M 5.2 Motronic system is the next generation of engine control. It incorporates features that allow it to comply with the OBD II requirements for the EPA.

Additionally, the EML throttle control system of the M73 engine is new for BMW and is designated EML IIIs. Manufactured by Siemens, EML IIIs is completely redesigned and functions differently as compared to previous EML systems.