|BMW M88 engine|
|Block material||Cast iron|
|Valvetrain||DOHC (M88) |
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 M90 is a SOHC engine which is based on the M88/1.
BMW engineers used DOHC valvetrain on a production engine for the first time on the M88, with the camshafts driven by a single-row timing chain. Kugelfischer fuel injection was used with individual throttle valves and the distinctive six individual throttle bodies.
|M88||277 PS (204 kW; 273 hp)
at 6,500 rpm
|330 N⋅m (243 lb⋅ft)
at 5,000 rpm
|M88/1||470 PS (346 kW; 464 hp)
at 9,000 rpm
|390 N⋅m (288 lb⋅ft)
at 7,000 rpm
|M88/2||up to 850 PS (630 kW; 840 hp)
at 9,000 rpm
|1979-1981||Gr. 5 turbo|
|M88/3||286 PS (210 kW; 282 hp)
at 6,500 rpm
|340 N⋅m (251 lb⋅ft)
at 4,500 rpm
|1983–1989||M635 CSi, M5|
|M90||218 PS (160 kW; 215 hp)
at 5,200 rpm
|304 N⋅m (224 lb⋅ft)
at 4,000 rpm
- 1978-1981 M1
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 470 PS (350 kW; 460 hp) in Procar specifications. This version had forged pistons, sharper camshafts, bigger valves, as well as oil cooling for the transmission and rear differential.
- 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 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 (900 hp).
- Group 5 racing cars
The M88/1 engine was modified for use in the E24 M635CSi and E28 M5 and was known as the M88/3. The Kugelfischer fuel injection was replaced with Bosch Motronic producing 210 kW (286 PS; 282 hp) at 6,500 rpm and 340 N⋅m (251 lbf⋅ft) at 4,500 rpm. It has a compression ratio of 10.5:1.
The M90 engine is a lower performance SOHC engine that was based on the M88/1. It utilizes the same block from the M88 and maintains the same bore and stroke, but borrows its head from the BMW M30 engine family. Different years of M90 engines used both Bosch Motronic and Bosch L-Jetronic engine management systems. 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.
The M90 sold in Europe and most other markets (except North America) used a compression ratio of 9.3:1, did not have a catalytic converter and produced 160 kW (215 hp).
- BMW S14 - Four-cylinder engine based on the M88
- "The Story of 40 Years BMW M ‒ The BMW M1". www.gtspirit.com. Retrieved 13 December 2018.
- "Top 5 Great BMW Engines - mydriftfun.com". www.mydriftfun.com. 11 May 2017. Retrieved 13 December 2018.
- "1984 BMW 745i E23 5-Speed manual M88 engined SA model road test". www.drive-my.com. Retrieved 2 December 2018.
- "BMW M88 and S38 M-Tech 24 Valve Six Cylinder Engines". www.unixnerd.demon.co.uk. Retrieved 2 December 2018.
- "Archived copy". Archived from the original on 2012-07-13. Retrieved 2012-08-15.CS1 maint: archived copy as title (link)
- "The BMW Six Cylinder Guide". www.autospeed.com.
- "Archived copy". Archived from the original on 2013-10-23. Retrieved 2012-08-15.CS1 maint: archived copy as title (link)
|M88 / M90||S38>>|
|Production of previous model continues in parallel|