BMW M73

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BMW
M73 engine in the BMW 750iL

M73 engine in the BMW 750iL
M73
Production period: 1994-2002
Manufacturer: BMW
Working principle: Gasoline engine
Motor design: 60 ° V , twelve-cylinder
Drilling: 85 or 86.4 mm
Hub: 79 or 85 mm
Displacement: 5379-5980 cm 3
Mixture preparation:
Engine charging:
Power: 240-316 kW
Max. Torque: 490-600 Nm
Previous model: M70
Successor: N73

The BMW M73 is a V12 gasoline engine from the car manufacturer BMW and was introduced in 1994 as the successor to the M70 . It was used in the BMW 7 Series , BMW 8 Series and the Rolls-Royce Silver Seraph .

construction

The engine block consists of an Alusil alloy, the cylinder heads with overhead camshafts made of aluminum . While most BMW engines were converted to four-valve technology at the time, the M73 remained with two valves per cylinder.

The vibration damper on the crankshaft was new, for which bearings from the eight-cylinder M60 were used. Knock sensors were also used. The springs on the valves had lower friction due to the smaller spring constants. For environmental reasons, the exhaust valves were now without sodium filling.

From model year 1999, the 750i received an electrically heated catalytic converter for the first time and from then on fulfilled the demanding American LEV and EU3 / D4 legislation with unchanged performance.

The performance of the BMW V12 concept became clear when it helped the closed McLaren BMW to its first major triumph as the winner of the Le Mans 24 Hours in 1995 in a version enlarged to six liters , and the overall victory of the BMW V12 LMR in the legendary 24 in 1999 Hour race. For racing, the engine output was throttled to around 580 hp by means of an air flow limiter . Without this limitation, the X5 Le Mans experimental vehicle produced around 700 hp.

Variant with hydrogen drive

M73 engine for hydrogen in the E38

In 2000 there was the M73 as a variant that could also be operated with hydrogen, in the 750hL . The difference to the pure petrol version are the hydrogen injection valves in the intake tract and a special electronic mixture formation system. In hydrogen mode, the engine then produces 150 kW / 204 PS, which accelerated the 750hL from 0 to 100 km / h in 9.6 seconds and was sufficient for a top speed of 226 km / h. On the Nürburgring-Nordschleife , the 750hL undercut the 10-minute limit for one lap quite clearly with 9 minutes and 53 seconds in operation with hydrogen. Fifteen 750hL had been produced in Dingolfing - BMW spoke of "small series" - served as shuttle vehicles at EXPO 2000 and then completed 150,000 km within the "CleanEnergy WorldTour 2001", which showed the suitability for everyday use.

Data

engine Displacement Bore × stroke Valves / cyl. compression Power at 1 / min Torque at 1 / min construction time
M73B54 5379 cm 3 85.0 mm × 79.0 mm 2 10.0: 1 240 kW (326 hp) at 5000 490 Nm at 3900 1994-1998
M73TUB54 1998-2002
Alpina 5980 cm 3 86.4 mm x 85.0 mm 2 10.25: 1 316 kW (430 hp) at 5400 600 Nm at 4200 1999-2002

use

M73

  • 1994–2001 in the BMW E38 750i / 750iL
  • 1994–1999 in the BMW E31 850Ci

M73 TU

D3

Awards

In 1999 the M73 won the "Over 4 liter" category of the International Engine of the Year award.

literature

Web links

Commons : BMW M73  - Collection of pictures, videos and audio files

Individual evidence

  1. ↑ Bimmertoday about the V12 LMR from April 2, 2011, accessed January 5, 2018.
  2. ↑ On March 13, 2018, the email request from February 19, 2018 was answered by wikisympathisant at BMW customer service (kundenbetreuung@bmw.de) that the hydrogen variant was based on the M73, not the M70 engine.
  3. ↑ Sustainable Value Report 2001/2002. (PDF) (No longer available online.) Bayerische Motoren Werke Aktiengesellschaft, September 2001, pp. 10–13 , archived from the original on August 27, 2016 ; accessed on January 3, 2018 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.bmwgroup.com
  4. ↑ a b CleanEnergy WorldTour 2001: Finale in Berlin. BMW Group, November 8, 2001, accessed on January 3, 2018 (press release).
  5. ↑ The hydrogen age has begun. (PDF) Bayerische Motoren Werke Aktiengesellschaft, May 11, 2000, accessed on January 4, 2018 (press release).
  6. ^ Emission Impossible. BMW Group, August 9, 2000, accessed on January 4, 2018 (press release).
Timeline of BMW gasoline engines for passenger cars since 1961
Number of cylinders Conception 1960s 1970s 1980s 1990s 2000s 2010s
0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th
3 1.5 l B38
4th (1.5–2.0 l) M10
M40
M42
M43
M44
N40
N42
N45
N46
N43
N13
N20
B48
High performance motor S14
6th Small six-cylinder (2.0-3.0 l) M20
M50
M52
M54
Large six-cylinder (2.5-3.5 l) M30
N52
N53
N54
N55
B58
High performance motor M88
S38
S50
S52
S54
S55
8th 3.0-4.4 l M60
M62
N62
N63
High performance motor S62
S63
S65
10 High performance motor S85
12 5.0-6.6 l M70
M73
N73
N74
High performance motor S70
Number of cylinders Conception 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th 9 0 1 2 3 4th 5 6th 7th 8th
1960s 1970s 1980s 1990s 2000s 2010s