BMW M88#Versions

BMW engineers used a DOHC valvetrain on a production engine for the first time on the M88, with the camshafts driven by a single-row timing chain.{{cite web|author=Horatiu Boeriu |url=http://www.bmwblog.com/2012/05/24/chris-harris-drives-the-e28-bmw-m5/ |title=Chris Harris Drives the E28 BMW M5 |publisher=Bmwblog.com |date=24 May 2012 |accessdate=31 May 2021}} Kugelfischer fuel injection was used with individual throttle valves{{cite web|url=http://www.bimmerforums.com/engine_faq.php |title=Engine FAQ |publisher=Bimmerforums.com |date=23 August 2009 |accessdate=31 May 2021}} and the distinctive six individual throttle bodies.

The construction is an aluminium cylinder head and a cast iron block.{{cite web |title=1984 BMW 745i E23 5-Speed manual M88 engined SA model road test |url=https://drive-my.com/en/blogs/entry/1984-bmw-745i-e23-5-speed-manual-m88-engined-sa-model-road-test.html |website=drive-my.com |date=16 March 2016 |access-date=2 December 2018 |language=en-gb}}{{cite web |title=BMW M88 and S38 M-Tech 24 Valve Six Cylinder Engines |url=http://www.unixnerd.demon.co.uk/s38.html |website=unixnerd.demon.co.uk |access-date=2 December 2018}} The bore is {{convert|93.4|mm|in|2|abbr=on}} and the stroke is {{convert|84.0|mm|in|2|abbr=on}}, resulting in a displacement of {{convert|3453|cc|cuin|1|abbr=on}}.

File:BMW M1 Ausstellungsmotor.jpg

The M88 was the original iteration of the engine and was fitted to the BMW M1. It produces {{cvt|277|PS|kW hp}} at 6,500 rpm and {{cvt|330|Nm|lbft}} at 5,500 rpm. A dry sump is used.{{cite web|title=The BMW Six Cylinder Guide|url=http://www.autospeed.com/cms/article.html?&title=The-BMW-Six-Cylinder-Guide&A=2948|website=autospeed.com}}

Applications:

• 1978-1981 M1

For the BMW M1 Procar single-make series, the M88 engine was bored out marginally to reach {{convert|3498|cc|L|1|abbr=on}}. This racing version, called the M88/1, met the Group 4 regulations. This race engine produced {{cvt|350|kW|PS hp}} in Procar specifications. This version had forged pistons, sharper camshafts, bigger valves, as well as oil cooling for the transmission and rear differential.

Applications:

• 1979-1980 Procar BMW M1

For Group 5 racing, the M88 engine was turbocharged and became known as the M88/2. It was downsleeved and had a shorter stroke to displace {{convert|3191|cc|L|1|abbr=on}}, which with the 1.4 turbo factor placed it in the 4.5-liter class. This race engine produced up to {{cvt|670|kW|PS hp}}.{{cite web |url=http://www.carlustblog.com/2012/05/bmw-m1.html |title=Car Lust: BMW M1 |access-date=15 August 2012 |url-status=dead |archive-url=https://web.archive.org/web/20120713005747/http://www.carlustblog.com/2012/05/bmw-m1.html |archive-date=13 July 2012 }}

Applications:

• Group 5 racing cars (BMW M1 Group 5 page)

File:BMW_M88_3_Auspuffseite.JPG and E28 M5.]]

The M88/1 engine was modified for use in the E24 M635CSi and E28 M5 and was known as the M88/3.{{cite web |url=http://www.usautoparts.net/bmw/models/m_series_history.htm |title=BMW World - BMW M Parts Series |access-date=15 August 2012 |url-status=dead |archive-url=https://web.archive.org/web/20131023232703/http://www.usautoparts.net/bmw/models/m_series_history.htm |archive-date=23 October 2013 }} The Kugelfischer fuel injection was replaced with Bosch Motronic producing {{cvt|210|kW|PS hp}} at 6,500 rpm and {{cvt|340|Nm|lbft}} at 4,500 rpm.{{cite web|url=http://www.bmwmregistry.com/model_faq.php?id=5 |title=FAQ E24 M635CSi + M6 |publisher=BMW M Registry |accessdate=31 May 2021}} It has a compression ratio of 10.5:1.

The M88/3 was also fitted to the South African BMW 745i, due to packaging problems with the turbocharged M102 engine which was used in other markets.{{cite web|url=http://www.bmwmregistry.com/model_faq.php?id=4 |title=FAQ E23 745i SA (M88) |publisher=BMW M Registry |accessdate=31 May 2021}}

Applications:

• 1983-1989 E24 M635CSi
• 1984-1987 E28 M5
• 1984-1987 E23 745i (South Africa only)

The M30B35LE is a lower performance, two-valve, SOHC version of the M88/1 engine, also known as the M90. It utilizes the same block as the M88 and maintains the same bore and stroke, but borrows its head from the BMW M30 engine family. Depending on year, this engine uses either Bosch Motronic or Bosch L-Jetronic as its engine management system.{{cite web|url=http://www.projectm1.com/index_files/Technology.htm |title=M1 Technology |publisher=Projectm1.com |accessdate=31 May 2021}}

Typically identified by a white L painted on the block behind the oil filter housing and coolant water passages on the side of the block.

As sold in Europe and most other markets (except North America), this engine used a compression ratio of 9.3:1, did not have a catalytic converter, and produced {{cvt|160|kW|PS hp}}.

Applications:

• 1979-1981 E12 M535i
• 1978-1982 E24 635CSi
• 1978-1982 E23 735i

• BMW S14 - Four-cylinder engine based on the M88

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{{BMW automotive petrol engines: 1960s to 1980s}}

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M88

Category:World Sportscar Championship engines

Category:Straight-six engines

Category:Gasoline engines by model