BMW M73
The BMW M73 is a SOHC V12 petrol engine which replaced the BMW M70 and was produced from 1993-2002. It was used in the BMW E38 7 Series, E31 8 Series and Rolls-Royce Silver Seraph.Design
Compared with its M70 predecessor, the M73 features an updated roller-rocker valve-train and an increased displacement, due to a bore increase of and a stroke increase of. While most other engines in the BMW range had switched to dual overhead camshafts with four valves per cylinder, the M73 used a single overhead camshalt and with two valves per cylinder.
Some versions of the engine have two separate Bosch Motronic engine control units, while others use a single Siemens ECU.Versions
M73B54
Applications:
- 1994-1998 E38 750i/750iL/L7
- 1994-1999 E31 850Ci
M73TUB54
Due to more stringent emissions standards, the 1999 model year marked the addition of an electronically heated catalyst, variable MAP thermostat, and water cooled alternator.
Applications:
