BMW M50
BMW M50 engine | |
---|---|
![]() Post-September 1992 version (M50TU) | |
Overview | |
Manufacturer | BMW |
Production | 1990–1996 |
Layout | |
Configuration | DOHC straight-6 |
Chronology | |
Predecessor | BMW M20 |
Successor | BMW M52 |
The BMW M50 is a straight-6 DOHC petrol engine which was produced from 1990 to 1996. It was released in the E34 520i and 525i, to replace the M20 engine.[1]
In September 1992, the M50 was upgraded to the M50TU ("technical update"), which added variable valve timing to the intake camshaft (called single VANOS by BMW).[2]
The M50 began to be phased out following the introduction of the M52 engine in 1994.
The E36 M3 is powered by the S50 engine series, which is a high output version of the M50.
Design
![](../I/m/BMW_E34_Touring_Lazurblau_1993_4.jpg)
A significant advance over its M20 predecessor, the M50 features dual overhead camshaft (DOHC) with 4 valves per cylinder (the M20 has a single overhead camshaft with 2 valves per cylinder), coil-on-plug ignition, a knock sensor and a lightweight plastic intake manifold.[3] Both engines use an iron block with an aluminum alloy head.[4] The redline is 6,500 rpm (except for S50 models), the same as the final version of the M20.
The location of the oil pan (sump) varies according to the model the M50 is installed in. It is in the front on the E34 5 Series (like the M20),[5] whereas it is in the rear on the E36 3 Series.[6]
Models
Engine | Displacement | Power | Torque | Bore | Stroke | Years |
---|---|---|---|---|---|---|
M50B20 | 1,991 cc (121 cu in) | 110 kW (148 bhp) @ 6000 rpm | 190 N⋅m (140 lb⋅ft) @ 4700 rpm | 80mm (3.1in) | 66mm (2.6in) | 1990-1992 |
M50B20TU | 110 kW (148 bhp) @ 5900 rpm | 190 N⋅m (140 lb⋅ft) @ 4200 rpm | 80mm (3.1in) | 66mm (2.6in) | 1992-1996 | |
M50B24TU | 2,394 cc (146 cu in) | 138 kW (185 bhp) @ 5900 rpm | 240 N⋅m (177 lb⋅ft) @ 4200 rpm | 84mm (3.3in) | 72mm (2.8in) | 1992-1996 |
M50B25 | 2,494 cc (152 cu in) | 141 kW (189 bhp) @ 6000 rpm | 245 N⋅m (181 lb⋅ft) @ 4700 rpm | 84mm (3.3in) | 75mm (3.0in) | 1990-1992 |
M50B25TU | 141 kW (189 bhp) @ 5900 rpm | 250 N⋅m (184 lb⋅ft) @ 4200 rpm | 84mm (3.3in) | 75mm (3.0in) | 1992-1996 | |
S50B30 (Euro-spec) | 2,990 cc (182 cu in) | 213 kW (286 bhp) @ 7400 rpm | 350 N⋅m (258 lb⋅ft) @ 3250 rpm | 86mm (3.4in) | 86mm (3.4in) | 1992-1996 |
S50B30US (US-spec) | 179 kW (240 bhp) @ 6000 rpm | 305 N⋅m (225 lb⋅ft) @ 4250 rpm | 86mm (3.4in) | 86mm (3.4in) | 1993-1995 | |
S50B32 | 3,201 cc (195 cu in) | 236 kW (316 bhp) @ 7400 rpm | 350 N⋅m (258 lb⋅ft) @ 3250 rpm | 91mm (3.58in) | 86.4mm (3.4in) | 1995-1996 |
M50B20
The 1,991 cc (121 cu in) M50B20 was introduced with the 1990 520i. It has an 80 mm (3.1 in) bore and 66 mm (2.6 in) stroke and produces 110 kW (150 PS). The compression ratio is 10.5:1.[7]
Applications:
M50B20TU
The M50B20 was updated with single VANOS in 1992. Peak torque became available at 4200 rpm.[7] It produces 110 kW (150 PS) at 5900 rpm and 190 N⋅m (140 lb⋅ft) at 4200 rpm. The compression ratio was raised to 11.0:1.
Applications:
M50B24TU
This is a 2.4 L engine used in the Thailand and Oceania markets.[8] It is based on the 2.5 L M50B25TU with the stroke reduced to 72 mm (2.8 in) and produces 138 kW (185 hp) (188 PS) at 5900 rpm and 240 N⋅m (177 lb⋅ft) at 4200 rpm. The compression ratio was 10.5:1.
Applications:
M50B25
The 2,494 cc (152 cu in) M50B25 was introduced with the 1990 525i and 525ix. It has an 84 mm (3.3 in) bore and 75 mm (3.0 in) stroke and produces 141 kW (189 hp) (192 PS) at 6000 rpm and 245 N⋅m (181 lb⋅ft) at 4700 rpm.[7] The compression ratio is 10.0:1.
Applications:
M50B25TU
The M50B25 was updated with single VANOS in 1992, resulting in peak torque becoming available at 4200 rpm. It produces 141 kW (189 hp) (192 PS) at 5900 rpm and 250 N⋅m (184 lb⋅ft) at 4200 rpm.[7] The compression ratio was increased to 10.5:1.
Applications:
S50
BMW S50 engine | |
---|---|
![]() | |
Overview | |
Manufacturer | BMW |
Production | 1992–1999 |
Layout | |
Configuration | DOHC straight-6 |
Chronology | |
Predecessor | None |
Successor | BMW S54 |
The S50 is the high performance version of the M50 which was used in the E36 M3, replacing the four-cylinder BMW S14 engine used in the E30 M3. Like the M50, the S50 has an iron block and aluminum head with four valves per cylinder.
S50B30
The S50B30 is a 2,990 cc (182 cu in) higher output version of the M50 which powered the E36 M3, except in the United States. In Canada, BMW officially imported 45 M3s produced in late 1993 with the S50B30 engine.[9][10]
The S50B30 produces 210 kW (282 hp), has a bore of 86 millimetres (3.4 in), a stroke of 86 millimetres (3.4 in) and a compression ratio of 10.8:1.[11][12] The redline is 7,600 rpm. The S50 has an individual throttle body for each cylinder, variable valve timing (called "VANOS" by BMW) on the intake camshaft, Motronic M3.3 engine management and redesigned intake and exhaust systems.[9]
The limited edition "M3 GT" model from 1995 produced 220 kW (295 hp).[9] It had different camshafts and a redesigned sump and oil pump.
Applications:
- 1992-1995 E36 M3 (except for US)
S50B30US
In the United States, the 1994-1995 M3 is powered by a 3.0 L tuned version of the M50 which produces 179 kW (240 hp).[9][13] This engine was based on the M50B25TU and uses the same compression ratio,[9] but uses a different crankshaft, connecting rods, and pistons. The bore is 86 mm (3.4 in), stroke is 86 mm (3.4 in) and the redline is 6,500 rpm.[14]
In 1996, the S50B30US was replaced by the 3.2 L S52 (in the United States and Canada only).[15]
Applications:
- 1994-1995 E36 M3 (US only)
S50B32
In 1996, the S50B32 replaced the S50B30 (except in Canada and the United States, where the S52 engine was used instead).[16] Power output increased to 321 PS (316.6 bhp; 236.1 kW) at 7400 rpm and 350 N⋅m (258.1 lb⋅ft) at 3250 rpm of torque.[17] [18] and the displacement increased to 3,201 cc (3.2 L; 195.3 cu in), due to an increased stroke of 91 mm (3.58 in) and a slight increase in bore to 86.4 mm (3.40 in).[19]
Variable valve timing is fitted to both camshafts and a secondary oil pick-up was added (from the "M3 GT" version of the S50B30).[20] The compression ratio is 11.3:1 and the redline is 7,400 rpm.[21] Engine management is provided by a Siemens MSS50, with 3 knock sensors.
Applications:
- 1996-1999 E36 M3 (except Canada and the United States)
- 1996-1999 Z3 M Coupe and M Roadster (except Canada and the United States)
See also
References
- ↑ "BMW 5 Series E34 History and Characteristics". www.bmwguide.net. Retrieved 27 October 2017.
- ↑ "BMW M50 engine". www.usautoparts.net. Archived from the original on 2012-05-12.
- ↑ "BMW M50 M52 M54 Engines". www.unixnerd.demon.co.uk.
- ↑ "The BMW Six Cylinder Guide". www.autospeed.com.
- ↑ "5' E34 525i Short Engine". www.realoem.com. Retrieved 28 September 2017.
- ↑ "3' E36 325i Short Engine". www.realoem.com. Retrieved 28 September 2017.
- 1 2 3 4 "Engine specifications- M50". www.bmwheaven.com.
- ↑ Hudock, Greg. BMW E - Series Restoration Bible. Brooklands Books. p. 8-6. ISBN 9781855209701.
- 1 2 3 4 5 "BMW M Registry - FAQ E36 M3 3.0". www.bmwmregistry.com.
- ↑ "1 of 45: 1994 BMW M3 Canadian Edition". www.germancarsforsaleblog.com. Retrieved 29 September 2017.
- ↑ "BMW E36 3 Series Coupe M3 Specs". www.ultimatespecs.com. Retrieved 1 October 2017.
- ↑ "1993 BMW M3 E36". www.carfolio.com.
- ↑ "Engine specifications- S50 B30 US". www.bmwheaven.com.
- ↑ "1994 BMW E36 3 Series Coupe M3 Automatic (US spec)". www.ultimatespecs.com.
- ↑ "E36 M3 coupe model selection- March 1996 in US spec". www.realoem.com.
- ↑ "1995-1999 BMW M3". www.motortrend.com.
- ↑ "1997 BMW M3 Coupé specifications". www.automobile-catalog.com. Retrieved June 18, 2018.
- ↑ "BMW E36 3-series Coupé specs". www.specs4bmw.com. Archived from the original on 2015-12-24.
- ↑ "Engine specifications- S50B32 Euro". www.bmwheaven.com.
- ↑ "FAQ E36 M3 3.2". www.bmwmregistry.com. Retrieved 1 October 2017.
- ↑ "BMW M Registry - FAQ E36/8 M coupe". www.bmwmregistry.com.
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