BMW M50#S50B30US

File:BMW E34 Touring Lazurblau 1993 4.jpg

A significant advance over its M20 predecessor, the M50 features dual overhead camshaft (DOHC) with four 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.{{cite web|title=BMW M50 M52 M54 Engines|url=http://www.unixnerd.demon.co.uk/m50.html|website=www.unixnerd.demon.co.uk|access-date=2015-11-03|archive-date=2018-09-27|archive-url=https://web.archive.org/web/20180927162926/http://www.unixnerd.demon.co.uk/m50.html|url-status=dead}} Both engines use an iron block with an aluminum alloy head.{{cite web |url=http://autospeed.com/cms/title_The-BMW-Six-Cylinder-Guide/A_2948/article.html |title=The BMW Six Cylinder Guide |website=www.autospeed.com |access-date=2012-06-24 |archive-url=https://web.archive.org/web/20120329195446/http://autospeed.com/cms/title_The-BMW-Six-Cylinder-Guide/A_2948/article.html |archive-date=2012-03-29 |url-status=dead }} The redline is 6,500 rpm for the M50B25 and 6,750 rpm for the M50B20 (7,000 rpm 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),{{cite web|title=5' E34 525i Short Engine|url=http://www.realoem.com/bmw/en/showparts?id=HD61-EUR-01-1995-E34-BMW-525i&diagId=11_0031|website=www.realoem.com|accessdate=28 September 2017}} whereas it is in the rear on the E36 3 Series.{{cite web|title=3' E36 325i Short Engine|url=http://www.realoem.com/bmw/en/showparts?id=CB31-EUR-03-1990-E36-BMW-325i&diagId=11_1295|website=www.realoem.com|accessdate=28 September 2017}}

File:BMW M50 engine in BMW-Museum in Munich, Bayern.JPG

The {{cvt|1991|cc|cuin|1}} M50B20 was introduced with the 1990 520i. It has a bore of {{cvt|80|mm|in|2|abbr=on}}, a stroke of {{cvt|66|mm|in|2|abbr=on}} and produces {{cvt|110|kW|PS hp|0}}. The compression ratio is 10.5:1.{{cite web|url=http://www.bmwheaven.com/database/engine.php?type=M50 |archive-url=https://archive.today/20130118090934/http://www.bmwheaven.com/database/engine.php?type=M50 |url-status=dead |archive-date=January 18, 2013 |title=Engine specifications- M50 |website=www.bmwheaven.com}}

Applications:

• 1990-1992 E34 520i
• 1991-1995 E36 320i

The M50B20 was updated with single VANOS in 1992. Peak torque became available at 4,200 rpm. It produces {{cvt|110|kW|PS hp|0}} at 5,900 rpm and {{cvt|190|Nm|lb·ft}} at 4,200 rpm. The compression ratio was raised to 11.0:1.

Applications:

• 1992-1994 E36 320i
• 1992-1996 E34 520i

This is a {{cvt|2394|cc|cuin|1}} engine used in the Thailand and Oceanian markets.{{cite book|last1=Hudock|first1=Greg|title=BMW E - Series Restoration Bible|date=14 October 2012|publisher=Brooklands Books|isbn=9781855209701|page=8-6|url=https://books.google.com/books?id=Wm6hFEwj6CsC&dq=bmw%20m50b24&pg=SA8-PA6}} It is based on the {{cvt|2494|cc|L|1}} M50B25TÜ with the stroke reduced to {{cvt|72|mm|in|2|abbr=on}} and produces {{cvt|138|kW|PS hp|0}} at 5,900 rpm and {{cvt|240|Nm|lb·ft}} at 4,200 rpm. The compression ratio is 10.5:1.

Applications:

• 1993-1995 E36 325iA/2.4
• 1992-1996 E34 525iA/2.4

The {{cvt|2494|cc|cuin|1}} M50B25 was introduced with the 1990 525i and 525ix. It has a bore of {{cvt|84|mm|in|2|abbr=on}}, a stroke of {{cvt|75|mm|in|2|abbr=on}} and produces {{cvt|141|kW|PS hp|0}} at 6,000 rpm and {{cvt|245|Nm|lb·ft}} at 4,700 rpm. The compression ratio is 10.0:1.

Applications:

• 1990-1992 E34 525i, 525ix
• 1991-1992 E36 325i, 325is

The M50B25 was updated with single VANOS in 1992, resulting in peak torque becoming available at 4,200 rpm. It produces {{cvt|141|kW|PS hp|0}} at 5,900 rpm and {{cvt|250|Nm|lb·ft}} at 4,200 rpm. The compression ratio was increased to 10.5:1.

Applications:

• 1993-1995 E36 325i, 325is
• 1992-1996 E34 525i, 525ix

{{unreferenced section|date=September 2021}}

In 1993, BMW Individual created a concept of BMW E34 530iX called Enduro Touring. Only one car was produced, having an up-sized variant of M50B25TÜ engine. Bore and stroke was increased and the total displacement of 3.0 was achieved. The power and torque both increased to {{cvt|181|kW|PS hp|0}} and {{cvt|316|Nm|lb·ft}} respectively.

{{Infobox automobile engine

|name=BMW S50 engine

|image=BMW M3 Evo Coupe E36 - Flickr - The Car Spy (5).jpg

|production=1992–2000{{cite web |title=BMW S50B32 automotive engine |url=https://bmw-grouparchiv.de/research/detail/index.xhtml?id=3943301 |website=bmw-grouparchiv.de |accessdate=18 June 2019}}

|configuration= Straight-6

|valvetrain =DOHC, with VVT

|head =Aluminium

|block =Cast iron

|predecessor= None

|successor=BMW S54

|fueltype=Petrol

|displacement={{cvt|2990|cc|cuin|0|lk=on}}
{{cvt|3201|cc|cuin|0|lk=on}}

| bore = {{cvt|86|mm|abbr=on}}
{{cvt|86.4|mm|abbr=on}}

| stroke = {{cvt|85.8|mm|abbr=on}}
{{cvt|91|mm|abbr=on}}

}}

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.

In the United States, a less powerful engine called the "S50B30US" was used, which shares more in common with the regular M50 engine than the other S50 versions.

The S50B30 was used in most countries, except for the United States.{{efn|In 1993, BMW Canada officially imported 45 M3 coupes with the S50B30 engine.{{cite web|title=1 of 45: 1994 BMW M3 Canadian Edition|url=http://germancarsforsaleblog.com/1-of-45-1994-bmw-m3-canadian-edition/|website=www.germancarsforsaleblog.com|date=18 August 2016 |accessdate=29 September 2017}}}} The S50B30 produces {{cvt|210|kW|PS hp|0}}, has a bore of {{cvt|86|mm|in|2}}, a stroke of {{cvt|85.8|mm|in|2}} and a compression ratio of 10.8:1.{{cite web|title=BMW E36 3 Series Coupe M3 Specs|url=https://www.ultimatespecs.com/car-specs/BMW/154/BMW-E36-3-Series-Coupe-M3.html|website=www.ultimatespecs.com|accessdate=1 October 2017}}{{cite web|title=1993 BMW M3 E36|url=http://www.carfolio.com/specifications/models/car/?car=54967|website=www.carfolio.com}} The redline is 7,200 rpm. The S50 has an individual throttle body for each cylinder, single-VANOS (variable valve timing on the intake camshaft), Bosch Motronic M3.3 engine management and redesigned intake and exhaust systems.{{cite web |title=BMW S50 in all its glory |url=https://drive-my.com/en/tech/item/1965-bmw-s50-in-all-its-glory.html |website=www.drive-my.com |date=30 October 2014 |accessdate=15 December 2018 |language=en-gb}}

The limited edition "M3 GT" model from 1995 produced {{cvt|220|kW|PS hp|0}}.{{cite web|title=BMW M Registry - FAQ E36 M3 3.0|url=http://www.bmwmregistry.com/model_faq.php?id=14|website=www.bmwmregistry.com}} It had different camshafts and a redesigned sump and oil pump.

Applications:

• 1992-1995 E36 M3 (except for U.S.)

In the United States, the 1994-1995 model years of the E36 M3 are powered by the S50B30US, a {{cvt|2990|cc|cuin|1|abbr=on}} engine which produces {{cvt|179|kW|PS hp|0}}.{{cite web|title=Engine specifications- S50 B30 US|url=http://www.bmwheaven.com/database/engine.php?type=Motorsport#/222|website=www.bmwheaven.com}} This engine is more closely related to the standard M50 engine and has the same compression ratio as the M50B25TÜ, but uses a different camshafts, crankshaft, connecting rods, and pistons. The bore is {{cvt|86|mm|in|2}}, the stroke is {{cvt|85.8|mm|in|2}} and the redline is 7,000 rpm.{{cite web|title=1994 BMW E36 3 Series Coupe M3 Automatic (US spec)|url=http://www.ultimatespecs.com/car-specs/BMW/14580/BMW-E36-3-Series-Coupe-M3-Automatic-%28US-spec%29.html|website=www.ultimatespecs.com}}

In 1996, the S50B30US was replaced by the BMW S52 engine (in the United States and Canada only).{{cite web|title=E36 M3 coupe model selection- March 1996 in US spec|url=http://www.realoem.com/bmw/enUS/select?product=P&archive=1&series=E36&body=Cou&model=M3&market=USA&prod=19960300&engine=S52|website=www.realoem.com}}

Applications:

• 1994-1995 E36 M3 (U.S. only)

In 1995, the S50B32 replaced the S50B30 in world markets.{{efn|United States and Canada received the BMW S52 instead.{{cite web|title=1995-1999 BMW M3|url=http://www.motortrend.com/buyersguide/preowned/112_0302_1995_1999_bmw_m3/|website=www.motortrend.com}}}} Power output increased to {{cvt|236|kW|PS hp|0}}{{cite web |title=BMW M3 Coupé, 321 PS (E36) |url=https://bmw-grouparchiv.de/research/detail/index.xhtml?id=3931554 |website=bmw-grouparchiv.de |access-date=4 January 2021}} and the displacement increased to {{cvt|3201|cc|L cuin|1|order=flip}}, due to an increased stroke of {{cvt|91|mm|in|2|abbr=on}} and a slight increase in bore to {{cvt|86.4|mm|in|abbr=on}}.{{cite web|title=Engine specifications- S50B32 Euro|url=http://www.bmwheaven.com/database/engine.php?type=Motorsport#/166|website=www.bmwheaven.com}}

The S50B32 has double-VANOS (variable valve timing on both camshafts) and a secondary oil pick-up was added.{{cite web|title=FAQ E36 M3 3.2|url=http://www.bmwmregistry.com/model_faq.php?id=15|website=www.bmwmregistry.com|accessdate=1 October 2017}} The compression ratio is 11.3:1 and the redline is 7,600 rpm.{{cite web|title=BMW M Registry - FAQ E36/8 M coupe|url=http://www.bmwmregistry.com/model_faq.php?id=17|website=www.bmwmregistry.com}} Engine management is the Siemens MSS50, with 3 knock sensors.

Applications:

• 1995-1999 BMW M3 (E36) (except Canada and the United States)
• 1996-2000 BMW M Coupé and M Roadster (except Canada and the United States)

• BMW engines

{{notelist}}

{{Reflist|30em}}

{{BMW automotive petrol engines: 1980s to 2000s}}

M50

Category:Straight-six engines

Category:Gasoline engines by model