BMW M70

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BMW M70 engine
BMW 850 V12.JPG
Overview
Production1987–1994
Layout
Configuration 60° V12
Displacement 5.0 L (4,988 cc)
Cylinder bore 84 mm (3.31 in)
Piston stroke 75 mm (2.95 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
Valvetrain SOHC
Combustion
Fuel type Petrol
Output
Power output 220 kW (295 hp)
Torque output 450 N⋅m (332 lb⋅ft)
Chronology
PredecessorNone
Successor BMW M73

The BMW M70 is a naturally-aspirated, SOHC, V12 petrol engine, which was BMW's first production V12 [1] and was produced from 1987 to 1996. It was also the first German 12-cylinder post-war automobile engine, predating Mercedes-Benz's M120 by four years and VAG's W12 by fourteen.

Contents

The BMW S70/2 engine, largely unrelated to the M70 and S70B56 engines, is a naturally-aspirated, DOHC, V12 petrol engine, which powered the 1993 to 1998 McLaren F1.

Design

The M70's design is similar to that of two 2.5 L M20 straight-six engines joined at a 60 degree angle, [2] due to the following features: single overhead camshaft valvetrain, bore spacing of 91 mm (3.6 in), bore of 84 mm (3.31 in), stroke of 75 mm (2.95 in), and a compression ratio of 8.8:1. [3]

The M70 has the following differences with the M20 engine:

The M70 has two Motronic 1.7 [7] ECUs (one for each cylinder bank). To provide redundancy, the M70 also has two fuel pumps, fuel rails, distributors, mass air flow sensors, crankshaft position sensors, coolant temperature sensors and throttle bodies. [8]

Some M70 engines (such as fitted to the E32 750iL Highline) are fitted with two alternators. The second alternator is smaller and is used to charge an auxiliary battery and power equipment in the rear passenger compartment, such as a telephone, fax machine, wine cooler, independent climate control and power sun shields. [9]

Versions

VersionDisplacementPowerTorqueRedlineYears
M70B50 4,988 cc (304.4 cu in)220 kW (295 hp) [10]
at 5,200 rpm		450 N⋅m (332 lb⋅ft)
at 4,100 rpm		6,0001987–1994
S70B56 5,576 cc (340.3 cu in)280 kW (375 hp)
at 5,300 rpm		550 N⋅m (406 lb⋅ft)
at 4,000 rpm		6,4001992–1996
S70/2 6,064 cc (370.0 cu in)461 kW (618 hp)
at 7,400 rpm		617 or 651 N⋅m (455 or 480 lb⋅ft)
at 6,700 rpm		7,5001993–1998
S70/3 5,990 cc (365.5 cu in)467 kW (626 hp)
at 6,500 rpm [lower-alpha 1] 		670 N⋅m (494 lb⋅ft)
at 4,500 rpm		8,0001998–2000
  1. ↑ S70/3 specifications are for the race car with twin 32.9 mm (1.30 in) air restrictors, [11] as required by 24 Hours of Le Mans rules at the time. [12]

M70B50

Applications:

S70 engine

BMW S70 engine
1996 McLaren F1 engine.jpg
Engine bay of a McLaren F1
Overview
Production1992–2000
Layout
Configuration 60° V12
Displacement 5.6 L (5,576 cc)
6.1 L (6,064 cc)
6.0 L (5,990 cc)
Cylinder bore 86 mm (3.39 in)
Piston stroke 80 mm (3.15 in)
87 mm (3.43 in)
85.9 mm (3.38 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
Valvetrain DOHC
Compression ratio 11:1
Combustion
Fuel type Petrol
Cooling system Water-cooled
Output
Power output 280–671 kW (375–900 hp)*(*900 PS produced only McLaren F1 GTR Long Tail specifically in full race trim upon qualification without racing restrictors) [13] [14] [15] [16]
Torque output 550–900 N⋅m (406–664 lb⋅ft)
Dimensions
Dry weight 265 kg (584 lb)
Chronology
PredecessorNone
SuccessorNone

S70B56

The first engine to use the S70 name is a 5,576 cc (340.3 cu in) variant of the M70 engine fitted only to the E31 850CSi. [17] With 1,510 units produced, this is the lowest production BMW engine to date. [18]

Three prototype dual overhead camshaft S70 engines were constructed, prior to the decision to not produce an E31 M8 model. [19]

Applications:

S70/2

The S70/2, while sharing the same 12 cylinder layout, bore spacing and design principle as the S70B56, is essentially a new design with the heads based on the European market S50B30, [20] and thus featuring 4 valves per cylinder and variable valve timing (called VANOS by BMW) and individual throttle bodies. A dry sump oiling system is used. [21] The weight of the S70/2, plus ancillaries and full exhaust, is 265 kg (584 lb). [22]

Applications:

S70/3

The S70/3 is a racing engine based on the S70/2.

Applications

See also

Related Research Articles

<span class="mw-page-title-main">McLaren F1</span> British sports car designed and manufactured by McLaren Automotive

The McLaren F1 is a sports car designed and manufactured by British automobile manufacturer McLaren Cars and powered by the BMW S70/2 V12 engine. The original concept was conceived by Gordon Murray, who successfully convinced Ron Dennis to back the project and hired car designer Peter Stevens to design the exterior and interior of the car. On 31 March 1998, the XP5 prototype with a modified rev limiter set the Guinness World Record for the world's fastest production car, reaching 240.1 mph (386.4 km/h), surpassing the modified Jaguar XJ220's 217.1 mph (349 km/h) record from 1993.

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<span class="mw-page-title-main">BMW S38</span> Reciprocating internal combustion engine

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<span class="mw-page-title-main">BMW 7 Series (E32)</span> Motor vehicle

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<span class="mw-page-title-main">BMW 7 Series (E38)</span> Motor vehicle

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<span class="mw-page-title-main">BMW N73</span> Reciprocating internal combustion engine

The BMW N73 is a naturally aspirated V12 petrol engine which replaced the BMW M73 and was produced from 2003–2016. It was used in the BMW 7 Series and Rolls-Royce Phantom.

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Paul Rosche was a German engineer known for his work at BMW. He is notable for designing the engines of a number of BMW's high-performance models, including the M31 found in the BMW 2002 Turbo, the S14 for the E30 M3, the M12 for the 320i Turbo and the Brabham BT52, the M88 in the M1 and the S70/2 found in the V12 LMR and the McLaren F1.

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The GMA is a 4.0-litre, naturally aspirated V12 engine, commissioned by Gordon Murray, and developed and produced by Cosworth for the Gordon Murray Automotive T.50 & T.33 sports cars. The road-going engine is rated at 663 PS at 11,500 rpm, with a max torque figure of 467 N⋅m (344 lbf⋅ft) at 9,000 rpm, making it the highest revving road car engine ever produced. The engine is also more powerful than the 6.1 L (6,064 cc) S70/2 V12 engine used in the McLaren F1, making more power from four litres than the S70/2 made from 6.1 litres.

References

  1. ↑ "BMW E32 parts". www.usautoparts.net. Archived from the original on 3 July 2013. Retrieved 4 August 2017.
  2. ↑ "The 8-Series Was One Of BMW's Best Failed Experiments". www.jalopnik.com. 5 June 2014. Retrieved 30 July 2017.
  3. ↑ "1989 BMW 750i E32 Specification". www.carfolio.com. Retrieved 4 August 2017.
  4. ↑ "BMW M70, M72 and M73 V12 Engines". www.unixnerd.demon.co.uk. Archived from the original on 7 January 2016. Retrieved 4 August 2017.
  5. ↑ "7' E32 750iL Mass air flow sensor". www.realoem.com. Retrieved 30 July 2017.
  6. ↑ "7' E32 750iL Timing and valve train-timing chain". www.realoem.com. Retrieved 30 July 2017.
  7. ↑ "BMW" (PDF). Archived from the original (PDF) on 2 February 2019. Retrieved 1 February 2019.
  8. ↑ "V12 (M70) Regular Maintenance". www.bmwe32.masscom.net. Retrieved 4 August 2017.
  9. ↑ "Engines Exposed: Just How Far Has BMW's Beastly V12 Come?". www.carbuzz.com. 5 February 2016. Retrieved 30 July 2017.
  10. ↑ "BMW M70B50 V12-Zylinder-Ottomotor". bmw-grouparchiv.de. Retrieved 6 February 2021.
  11. ↑ "Le Mans '99". bmw-grouparchiv.de. Retrieved 9 June 2019.
  12. ↑ "Diamètre des brides / Air rectrictors diameter" (PDF). lemans-history.com. Retrieved 9 June 2019.
  13. ↑ "McLaren F1 GTR Longtail stretches its legs at Spa-Francorchamps".
  14. ↑ "1997 McLaren F1 GTR Long Tail | McLaren". 18 April 2016.
  15. ↑ [ dead link ]
  16. ↑ "Street-Legal McLaren F1 GTR Longtail Has Rich History, $15 Million Asking Price". Carscoops. 2020-06-18. Retrieved 2022-08-12.
  17. ↑ "Engine specifications for Motorsport engines". www.bmwheaven.com. Retrieved 4 August 2017.
  18. ↑ "Worldwide Shipments: S70 850CSi 1992–1996". www.8coupe.com. Retrieved 4 August 2017.
  19. ↑ "BMW S70 and S70/2 V12 Engines". www.unixnerd.demon.co.uk. Archived from the original on 19 August 2017. Retrieved 4 August 2017.
  20. ↑ "BMW Classic – Recherche-Client". bmw-grouparchiv.de. Retrieved 28 February 2018.
  21. ↑ "1994 McLaren F1: First Drive Flashback". Road & Track. 14 December 2014. Retrieved 4 May 2017.
  22. ↑ "F1 – McLaren's Road Car An Autocar & Motor Book". www.audiosignal.co.uk. Retrieved 4 August 2017.
  23. ↑ "BMW Shows the X5 le Mans Concept and Its V12 Engine with 700+ HP".
  24. ↑ "2001 BMW X5 le Mans Concept Had the V-12 Heart of a McLaren F1". 16 June 2020.
  25. ↑ "The BMW X5 le Mans".
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