BMW M88
Template:Use dmy dates Template:Infobox automobile engine
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.<ref name="gtspirit.com">Template:Cite web</ref><ref name="mydriftfun.com">Template:Cite web</ref><ref>Template:Cite web</ref>
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.<ref>Template:Cite web</ref> Kugelfischer fuel injection<ref name=projectM1 /> was used with individual throttle valves<ref>Template:Cite web</ref> and the distinctive six individual throttle bodies.
The construction is an aluminium cylinder head and a cast iron block.<ref>Template:Cite web</ref><ref>Template:Cite webTemplate:Dead link</ref> The bore is Template:Convert and the stroke is Template:Convert, resulting in a displacement of Template:Convert.
Versions
| Engine code | Power | Torque | Years | Note |
|---|---|---|---|---|
| M88 | Template:Cvt at 6,500 rpm |
Template:Convert at 5,000 rpm |
1978-1981 | BMW M1 |
| M88/1 | Template:Cvt at 9,000 rpm |
Template:Convert at 7,000 rpm |
1979-1980 | Gr.4 Procar |
| M88/2<ref>Template:Cite web</ref><ref>Template:Cite web</ref> | up to Template:Cvt at 9,000 rpm |
Template:Convert at 7,000 rpm<ref>Template:Cite web</ref> | 1979-1981 | Gr. 5 turbo |
| M88/3 | Template:Cvt at 6,500 rpm |
Template:Convert at 4,500 rpm |
1983–1989 | M635 CSi, M5, 745i (South Africa only) |
| M30B35LE/M90 | Template:Cvt at 5,200 rpm |
Template:Convert at 4,000 rpm |
1978–1982 | SOHC |
M88
The M88 was the original iteration of the engine and was fitted to the BMW M1. It produces Template:Cvt at 6,500 rpm and Template:Cvt at 5,500 rpm. A dry sump is used.<ref>Template:Cite web</ref>
Applications:
- 1978-1981 M1
M88/1
For the BMW M1 Procar single-make series, the M88 engine was bored out marginally to reach Template:Convert. This racing version, called the M88/1, met the Group 4 regulations. This race engine produced Template:Cvt 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
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 Template:Convert, which with the 1.4 turbo factor placed it in the 4.5-liter class. This race engine produced up to Template:Cvt.<ref name=carlust>Template:Cite web</ref>
Applications:
- Group 5 racing cars (BMW M1 Group 5 page)
M88/3
The M88/1 engine was modified for use in the E24 M635CSi and E28 M5 and was known as the M88/3.<ref>Template:Cite web</ref> The Kugelfischer fuel injection was replaced with Bosch Motronic producing Template:Cvt at 6,500 rpm and Template:Cvt at 4,500 rpm.<ref>Template:Cite web</ref> 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.<ref>Template:Cite web</ref>
Applications:
Template:Anchor 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.<ref name=projectM1>Template:Cite web</ref> 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 Template:Cvt.
Applications:
See also
- BMW S14 - Four-cylinder engine based on the M88