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M635CSi M6
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Produced
April 1984 – February 1989.
Engine
In-line 6-cylinder, iron block and aluminium DOHC 24-valve cylinder head. 
93.4 x 84mm, 3,453cc, compression ratio 10.5:1
.Bosch L Jetronic fuel injection.
286bhp at 6,500rpm, (260bhp with catalyst)
251lb.ft at 4,500rpm (243lb.ft with catalyst).
Transmission
Front engine, rear drive.  Final drive 3.73:1 or 3.91:1,
25% limited-slip differential
Gear ratios
1st 3.51;
2nd 2.08;
3rd 1.35;
4th 1.00;
5th 0.81:1.
Suspension
IFS, coil springs, MacPherson struts, lower wishbones, anti-roll bar. 
IRS, coil springs, semi-trailing arms, telescopic dampers, anti-roll bar
steering
Recirculating-ball steering (16.9:1) ratio), power assisted. 
brakes
Servo-assisted 300mm / 11.8in vented front discs,
272mm / 10.7in solid rear discs.
Wheels & Tyres
Alloy 165 x 390mm wheels with 220/55 VR390 tyres
or
210 x 415 wheels with 240 / 45 VR415 tyres (from September 87):
Standard 245 / 45 VR415 tyres).
Body
2-door coupe in steel.
Dimensions
Length 4,755mm / 187.2in, wheelbase 2,625mm / 103.3in, width 1,725mm / 67.9in, height 1,353mm / 53.2in, kerb weight 1,510kg / 3,329lb.
Number produced
5,855
UK retail price
£32,195 in 1985.
Performance Figures
Quoted bhp                          286
Maximum (mph)                   150
0-30mph (sec)                      2.4
0-40mph                               3.5
0-50mph                               4.6
0-60mph                               6.0
0-70mph                               7.9
0-80mph                               9.9
0-90mph                             12.1
0-100mph                           15.1
0-110mph                           18.4
0-120mph                           22.5
Standing ¼ mile                  14.6
50-70mph (top)                     9.3
Overall mpg                        20.6
Kerb weight (kg)               1,570
Source / date
Autocar        1/89