BMW M73
| BMW M73 engine | |
|---|---|
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| Overview | |
| Manufacturer | BMW |
| Production | 1993–2002 |
| Layout | |
| Configuration | SOHC 60° V12 |
| Chronology | |
| Predecessor | BMW M70 |
| Successor | BMW N73 |
The BMW M73 is a 60° V12 SOHC petrol engine which replaced the M70 and was produced from 1993-2002. It was used in the BMW 7 Series, 8 Series and Rolls-Royce Silver Seraph.
Design
Compared with its M70 predecessor, the M73 features increased displacement thanks to increased bore (85mm up from 84mm) and stroke (79mm up from 75mm), and an updated roller-rocker valve-train.[1] While most other engines in the BMW range had switched to DOHC and 4 valves per cylinder, the M73 used SOHC and 2 valves per cylinder.[2]
Some versions of the engine have two separate Bosch Motronic ECUs,[3] while others use a single Siemens ECU.[4]
Models
| Engine | Displacement | Power | Torque | Redline | Year |
|---|---|---|---|---|---|
| M73B54 | 5,379 cc (328 cu in) | 240 kW (320 hp) @ 5000 rpm |
490 N⋅m (360 lb⋅ft) @ 3900 rpm |
6000 | 1994 |
| M73TUB54 | 1998 |
M73B54
Applications:
M73TUB54
Due to more stringent emissions standards, the 1999 model year marked the addition of an electronically heated catalyst,[5] variable MAP thermostat, and water cooled alternator.
Applications:
- 1998-2001 E38 750i/750iL/L7
- 1999-2002 Rolls-Royce Silver Seraph
Awards
- 1999 International Engine of the Year - Best Above 4.0 Litre category winner[2]
References
- ^ "Information on M73 engines". www.bmwheaven.com. Retrieved 5 August 2017.
- ^ a b "BMW Super Bild Of The Day: 5.4 liter BMW V12". www.bmwblog.com. Retrieved 5 August 2017.
- ^ M73 Training Reference Manual (PDF). p. 2. Retrieved 10 April 2017.
- ^ "E38 750iL Engine electrical system engine". www.realoem.com. Retrieved 10 April 2017.
- ^ "BMW M70, M72 and M73 V12 Engines". www.unixnerd.demon.co.uk. Retrieved 5 August 2017.