B
ody and chassi developments that started some years ago made it´s debut this year. An average of 60kg/132 lbs was reduced from the body, giving a total weight of 1430 kg for all models. The modifications not only made the car lighter, but also a lot stronger. BMW had spent a lot of time (and money) in laboratory simulations and crash tests that finally resulted in the completely reworked and stronger body shell.
Chassis engineering
The most noticeable changes to the chassis was a new front and rear end adopted from the 5-series (that got the same setup a year earlier). The front end got a full double link suspension and the rear end got a new 13° trailing arm layout with an additional top mounted link. All toghether it was a package that improved the road-holding quite significant.
Further news on the chassis was that the ABS breaks that had been optional since 1979 now become standard for all 635 CSi models, but still goes as option for 628. It was a standard for all models since September 1984.
New engine for 635 CSi
The somewhat overbored 3453cc engine for the 635 CSi was found to have some service problems, this was also the reason why BMW developed a new engine for the 635 CSi.
The new engine was developed from the 3210cc unit found in 633 CSi. It had the same 86 mm stroke but a new 92 mm bore, giving a total of 3430cc.
The power and torque remained the same as it's precursor, thanks to a new version of the DME unit and a higher (10:1) compression ratio. The new DME had a new graph to control the warm-up cold start phase and the idling speed was reduced by 50 rpm.
All this, together with a standard overdrive five speed gearbox reduced the fuel consumption about 15%.
Interior
The interior was reworked with a new three spoke steering wheel, a new dash layout including a Service Interval Indicator (SII) , electric fuel economy indicator , new layout of the Check Control system.
Standard in 635 CSi but optional in other models was a new 10 function On-board computer (OBC).
Exterior
The exterior was left almost unchanged, most noticeable was that the fog lamps where integrated with the front end panelwork, on the 628/633 CSi that is. The 635 CSi still had the fog lamps mounted in front of the front spoiler.
633 CSi no longer available in Europe
The 633 CSi was still in production, mainly for Japan and USA, but it was not available in Europe.
6-Series in USA
1982, was when the US received the later style intake manifold with the 3.2/3.5 casting. The interior and exterior were not updated until 1983.
Production numbers for 1982
|
Model
|
Units
|
|
628 CSi
|
613
|
|
628 CSi A
|
266
|
|
628 CSi RHD
|
53
|
|
628 CSi A RHD
|
179
|
|
633 CSi USA
|
1102
|
|
633 CSi A USA
|
933
|
|
633 CSi A Japan
|
299
|
|
635 CSi
|
2400
|
|
635 CSi A
|
1009
|
|
635 CSi RHD
|
165
|
|
635 CSi A RHD
|
574
|
|
Total:
|
7593
|
|
Source: Bmwcoupe.nu
