BMW M73

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BMW M73 engine
BMW 750iL Individual - Flickr - The Car Spy (21).jpg
Overview
Production1993–2002
Layout
Configuration60° V12
Displacement5.4 L (330 cu in)
ValvetrainSOHC
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M70
SuccessorBMW N73

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[edit]

Compared with its M70 predecessor, the M73 features an updated roller-rocker valve-train and an increased displacement, due to a bore increase of 1 mm (0.04 in) and a stroke increase of 4 mm (0.16 in).[1] While most other engines in the BMW range had switched to dual overhead camshafts with four valves per cylinder per cylinder, the M73 used a single overhead camshalt and with two valves per cylinder.[2]

Some versions of the engine have two separate Bosch Motronic engine control units,[3] while others use a single Siemens ECU.[4]

Versions[edit]

Engine Displacement Power Torque Year
M73B54 5,379 cc (328.2 cu in) 240 kW (322 hp)
at 5,000 rpm
490 N⋅m (361 lb⋅ft)
at 3,900 rpm
1994
M73TUB54 1998

M73B54[edit]

Applications:

  • 1994-1998 E38 750i/750iL/L7
  • 1994-1999 E31 850Ci

M73TUB54[edit]

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:

Awards[edit]

References[edit]

  1. ^ "Information on M73 engines". www.bmwheaven.com. Retrieved 5 August 2017.
  2. ^ a b "BMW Super Bild Of The Day: 5.4 liter BMW V12". www.bmwblog.com. Retrieved 5 August 2017.
  3. ^ M73 Training Reference Manual (PDF). p. 2. Retrieved 10 April 2017.
  4. ^ "E38 750iL Engine electrical system engine". www.realoem.com. Retrieved 10 April 2017.
  5. ^ "BMW M70, M72 and M73 V12 Engines". www.unixnerd.demon.co.uk. Retrieved 5 August 2017.

See also[edit]