BMW M88

Last updated

BMW M88 engine
Bmw m88.jpg
Overview
Manufacturer BMW
Also called
  • BMW M30B35LE
  • BMW M90
Production1978–1989
Layout
Configuration Straight-6
Displacement 3.5 L (3,453 cc)
Cylinder bore 93.4 mm (3.7 in)
Piston stroke 84 mm (3.3 in)
Cylinder block material Cast iron
Cylinder head material Aluminium
Valvetrain DOHC (M88)
SOHC (M30B35LE/M90)
Combustion
Fuel type Petrol
Chronology
PredecessorNone
Successor BMW S38

The BMW M88 is a straight-6 DOHC petrol engine which was produced from 1978 to 1989. It is based on the DOHC version of the BMW M49 engine, which was used in the BMW 3.0CSi racing cars. [1] [2] [3]

Contents

The M88 was produced alongside the BMW M30 engine, as the higher performance engine. In North America up until 1989, the BMW S38 engine was used instead of the M88. In 1989, an updated version of the S38 became the worldwide replacement for the M88. The M30B35LE is a SOHC engine which is based on the M88/1; this is sometimes referred to as the M90.

Design

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. [4] Kugelfischer fuel injection [5] was used with individual throttle valves [6] and the distinctive six individual throttle bodies.

The construction is an aluminium cylinder head and a cast iron block. [7] [8] The bore is 93.4 mm (3.68 in) and the stroke is 84.0 mm (3.31 in), resulting in a displacement of 3,453 cc (210.7 cu in).

Versions

Engine codePowerTorqueYearsNote
M88204 kW (277 PS; 273 hp)
at 6,500 rpm		330 N⋅m (243 lb⋅ft)
at 5,000 rpm		1978-1981BMW M1
M88/1346 kW (470 PS; 464 hp)
at 9,000 rpm		390 N⋅m (288 lb⋅ft)
at 7,000 rpm		1979-1980Gr.4 Procar
M88/2 [9] [10] up to 625–735 kW (850–1,000 PS; 838–986 hp)
at 9,000 rpm		847–1,017 N⋅m (625–750 lb⋅ft) at 7,000 rpm [11] 1979-1981Gr. 5 turbo
M88/3210 kW (286 PS; 282 hp)
at 6,500 rpm		340 N⋅m (251 lb⋅ft)
at 4,500 rpm		1983–1989M635 CSi, M5, 745i (South Africa only)
M30B35LE/M90160 kW (218 PS; 215 hp)
at 5,200 rpm		304 N⋅m (224 lb⋅ft)
at 4,000 rpm		1978–1982SOHC

M88

M88/1 with some parts replaced with Plexiglas for display purposes BMW M1 Ausstellungsmotor.jpg
M88/1 with some parts replaced with Plexiglas for display purposes

The M88 was the original iteration of the engine and was fitted to the BMW M1. It produces 277 PS (204 kW; 273 hp) at 6,500 rpm and 330 N⋅m (240 lb⋅ft) at 5,500 rpm. A dry sump is used. [12]

Applications:

M88/1

For the BMW M1 Procar single-make series, the M88 engine was bored out marginally to reach 3,498 cc (3.5 L). This racing version, called the M88/1, met the Group 4 regulations. This race engine produced 350 kW (480 PS; 470 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:

M88/2

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 3,191 cc (3.2 L), which with the 1.4 turbo factor placed it in the 4.5-liter class. This race engine produced up to 670 kW (910 PS; 900 hp). [13]

Applications:

M88/3

M88/3 iteration used in the E24 M635CSi and E28 M5. BMW M88 3 Auspuffseite.JPG
M88/3 iteration used in the E24 M635CSi 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. [14] The Kugelfischer fuel injection was replaced with Bosch Motronic producing 210 kW (290 PS; 280 hp) at 6,500 rpm and 340 N⋅m (250 lb⋅ft) at 4,500 rpm. [15] 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. [16]

Applications:

M30B35LE

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. [5] 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 160 kW (220 PS; 210 hp).

Applications:

See also

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References

  1. ↑ "The Story of 40 Years BMW M ‒ The BMW M1". gtspirit.com. Retrieved 13 December 2018.
  2. ↑ "Top 5 Great BMW Engines". mydriftfun.com. 11 May 2017. Archived from the original on 15 December 2018. Retrieved 13 December 2018.
  3. ↑ "M Division's Greatest Competition Engines – Infernal Combustion". Infernalco.co. 20 March 2018. Retrieved 31 May 2021.
  4. ↑ Horatiu Boeriu (24 May 2012). "Chris Harris Drives the E28 BMW M5". Bmwblog.com. Retrieved 31 May 2021.
  5. 1 2 "M1 Technology". Projectm1.com. Retrieved 31 May 2021.
  6. ↑ "Engine FAQ". Bimmerforums.com. 23 August 2009. Retrieved 31 May 2021.
  7. ↑ "1984 BMW 745i E23 5-Speed manual M88 engined SA model road test". drive-my.com. 16 March 2016. Retrieved 2 December 2018.
  8. ↑ "BMW M88 and S38 M-Tech 24 Valve Six Cylinder Engines". unixnerd.demon.co.uk. Retrieved 2 December 2018.
  9. ↑ "Issue #07".
  10. ↑ "From M121 to P48: An overview of the evolution of BMW Turbo engines in motor racing".
  11. ↑ "Spicer Horsepower and Torque Calculator".
  12. ↑ "The BMW Six Cylinder Guide". autospeed.com.
  13. ↑ "Car Lust: BMW M1". Archived from the original on 13 July 2012. Retrieved 15 August 2012.
  14. ↑ "BMW World - BMW M Parts Series". Archived from the original on 23 October 2013. Retrieved 15 August 2012.
  15. ↑ "FAQ E24 M635CSi + M6". BMW M Registry. Retrieved 31 May 2021.
  16. ↑ "FAQ E23 745i SA (M88)". BMW M Registry. Retrieved 31 May 2021.
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