BMW M70
| BMW M70 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | BMW |
| Production | 1988–1996 |
| Layout | |
| Configuration | V12 |
| Chronology | |
| Predecessor | None |
| Successor | BMW M73 |
The BMW M70 is a V12 SOHC piston engine which was BMW's first production V12[1] and was produced from 1988-1996.
Design
The M70 was essentially derived from two M20 straight-6 engines joined at a 60 degree angle.[2] The engine has the bore and stroke as the M20,[3] also the M70 has two Motronic ECUs (one for each cylinder bank).[4]
The compression ratio is 8.8:1, stroke is 75 mm (3.0 in) and bore is 84 mm (3.3 in).[5]
Models
| Engine | Displacement | Power | Torque | Redline | Year |
|---|---|---|---|---|---|
| M70B50 | 4,988 cc (304 cu in) | 220 kW (300 hp) @ 5200 | 450 N⋅m (330 lb⋅ft) @ 4100 | 6000 | 1988 |
| S70B56 | 5,576 cc (340 cu in) | 280 kW (380 hp) @ 5300 | 550 N⋅m (410 lb⋅ft) @ 4000 | 1992 | |
| S70/2 | 6,064 cc (370 cu in) | 461 kW (618 hp) @ 7400 | 650 N⋅m (480 lb⋅ft) @ 4000 | 7500 | 1992 |
| S70/3 | 5,990 cc (366 cu in) | 448 kW (601 hp) @ 7500 | 651 N⋅m (480 lb⋅ft) @ 5600 | 7500 | 1997 |
M70B50
Applications:
S70
The first engine named S70 was an enlarged version of the M70 fitted to the 850CSi.
S70B56
This is a 5,576 cc (340 cu in) variant of the M70 engine.[6] With 1,510 units produced, this is the lowest production BMW engine to date.[7]
Applications:
- 1992–1996 E31 850CSi
S70/2
Among the improvements over the other M70/S70 engines, the S70/2 features 4 valves per cylinder and variable valve timing (called dual-VANOS by BMW).[8]
Applications:
- 1993-1998 McLaren F1
- 1998–1999 BMW V12 LM
- 1999–2000 BMW V12 LMR
- 1995-1996 Chevrolet Impala 6.1 V12
References
- ^ http://www.usautoparts.net/bmw/models/e32.htm
- ^ http://autospeed.com.au/cms/title_2004-Engine-Epic-BMW-Engines/A_2107/article.html
- ^ http://www.carfolio.com/specifications/models/car/?car=14322
- ^ http://www.wokke.de/Chiptuning/Chip_Installation.htm
- ^ http://www.carfolio.com/specifications/models/car/?car=14322
- ^ http://www.bmwheaven.com/database/engine.php?type=Motorsport#/167
- ^ http://www.8coupe.com/Production/WorldwideShipments/S70850CSi19921996.aspx
- ^ http://www.audiosignal.co.uk/McLarenF1.html
External links
- http://bmwe32.masscom.net Johan & Sean's E32 Page - Homepage containing detailed DIY and engine rebuild information for the M70 engine as well as links to official BMW AG engine specs and component descriptions.
- http://www.audiosignal.co.uk/McLarenF1.html Information on McLaren F1 engine