BMW M88

Source: Wikipedia, the free encyclopedia.

BMW M88 engine
Petrol
Chronology
PredecessorNone
SuccessorBMW S38

The

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]

The M88 was produced alongside the

SOHC
engine which is based on the M88/1; this is sometimes referred to as the M90.

Design

BMW engineers used a

individual throttle bodies
.

The construction is an aluminium

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 code Power Torque Years Note
M88 204 kW (277 PS; 273 hp)
at 6,500 rpm		 330 N⋅m (243 lb⋅ft)
at 5,000 rpm		 1978-1981 BMW M1
M88/1 346 kW (470 PS; 464 hp)
at 9,000 rpm		 390 N⋅m (288 lb⋅ft)
at 7,000 rpm		 1979-1980 Gr.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] 1979-1981 Gr. 5 turbo
M88/3 210 kW (286 PS; 282 hp)
at 6,500 rpm		 340 N⋅m (251 lb⋅ft)
at 4,500 rpm		 1983–1989 M635 CSi, M5, 745i (South Africa only)
M30B35LE/M90 160 kW (218 PS; 215 hp)
at 5,200 rpm		 304 N⋅m (224 lb⋅ft)
at 4,000 rpm		 1978–1982 SOHC

M88

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:

  • 1978-1981 M1

M88/1

For the BMW M1

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:

  • BMW M1 Group 5 page
    )

M88/3

M88/3 iteration used in the E24 M635CSi and E28 M5.

The M88/1 engine was modified for use in the

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,

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:

  • 1979-1981
    M535i
  • 1978-1982
    635CSi
  • 1978-1982
    735i

See also

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

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. ^ a b "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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