Key Specifications

Spec	Value
Production Years	1976-1989
Manufacturer	Bayerische Motoren Werke AG
Assembly	Dingolfing, Germany
Body Style	2-door pillarless coupe
Layout	Front engine, rear-wheel drive
Platform	BMW E24
Designer	Paul Bracq
Wheelbase	2,626 mm
Overall Length	4,755 mm
Overall Width	1,725 mm
Overall Height	1,354 mm
Front Track	1,430 mm
Rear Track	1,462 mm
Kerb Weight	1,420-1,560 kg (varies by model)
Fuel Tank Capacity	70 L
Boot Capacity	410 L
Drag Coefficient	0.39
Weight Distribution	52:48 front:rear (635CSi), 51:49 (M635CSi)
Total Production	~86,216 units

Engine Specifications

M30B28, 630CS (1976-1979)

Spec	Value
Configuration	Inline 6, SOHC, 12-valve
Displacement	2,788 cc
Bore x Stroke	86.0 mm x 80.0 mm
Compression Ratio	9.0:1
Power	136 kW (185 hp) @ 5,800 rpm
Torque	260 Nm (192 lb-ft) @ 4,000 rpm
Fuel System	Solex 4A1 four-barrel carburettor
Ignition	Breakerless electronic
Valvetrain Drive	Single-row timing chain
Redline	6,200 rpm
Engine Oil Capacity	5.5 L (with filter)

M30B32, 633CSi (1976-1984)

Spec	Value
Configuration	Inline 6, SOHC, 12-valve
Displacement	3,210 cc
Bore x Stroke	89.0 mm x 86.0 mm
Compression Ratio	9.3:1
Power	143 kW (197 hp) @ 5,500 rpm
Torque	286 Nm (211 lb-ft) @ 4,300 rpm
Fuel System	Bosch L-Jetronic (early) / Bosch Motronic (from 1982)
Ignition	Breakerless electronic / Motronic integrated
Valvetrain Drive	Single-row timing chain
Redline	6,200 rpm
Engine Oil Capacity	5.5 L (with filter)

M30B34, 635CSi (1978-1989)

Spec	Value
Configuration	Inline 6, SOHC, 12-valve
Displacement	3,430 cc
Bore x Stroke	92.0 mm x 86.0 mm
Compression Ratio	9.3:1 (L-Jetronic) / 10.0:1 (Motronic)
Power	160 kW (218 hp) @ 5,200 rpm
Torque	310 Nm (229 lb-ft) @ 4,000 rpm
Fuel System	Bosch L-Jetronic (1978-1982) / Bosch Motronic 1.0/1.3 (1982-1989)
Ignition	Motronic integrated (from 1982)
Valvetrain Drive	Single-row timing chain
Redline	6,200 rpm
Engine Oil Capacity	5.5 L (with filter)

M88/3, M635CSi (1984-1989)

Spec	Value
Configuration	Inline 6, DOHC, 24-valve
Displacement	3,453 cc
Bore x Stroke	93.4 mm x 84.0 mm
Compression Ratio	10.5:1
Power	210 kW (286 hp) @ 6,500 rpm
Torque	340 Nm (251 lb-ft) @ 4,500 rpm
Fuel System	Bosch ML-Jetronic with mechanical injection
Ignition	Bosch electronic
Valvetrain	Bucket-and-shim, chain driven DOHC
Individual Throttle Bodies	6 x individual throttle butterflies
Redline	6,900 rpm
Engine Oil Capacity	6.0 L (with filter)

S38B35, M6 (US market, 1987-1989)

Spec	Value
Configuration	Inline 6, DOHC, 24-valve
Displacement	3,453 cc
Bore x Stroke	93.4 mm x 84.0 mm
Compression Ratio	9.8:1
Power	190 kW (256 hp) @ 6,500 rpm
Torque	330 Nm (243 lb-ft) @ 4,500 rpm
Fuel System	Bosch Motronic 1.2
Ignition	Motronic integrated
Valvetrain	Bucket-and-shim, chain driven DOHC
Individual Throttle Bodies	6 x individual throttle butterflies
Redline	6,900 rpm
Engine Oil Capacity	6.0 L (with filter)

Transmission Specifications

Manual Gearbox, Getrag 265 (5-speed)

Spec	Value
Type	5-speed manual, synchromesh all gears
1st Gear	3.83:1
2nd Gear	2.20:1
3rd Gear	1.40:1
4th Gear	1.00:1
5th Gear	0.81:1
Reverse	4.23:1
Oil Type	MTF-1 or Redline MT-90 (GL-4)
Oil Capacity	1.2 L

Automatic Gearbox, ZF 4HP22 (4-speed)

Spec	Value
Type	4-speed torque converter automatic
1st Gear	2.73:1
2nd Gear	1.56:1
3rd Gear	1.00:1
4th Gear	0.73:1
Reverse	2.09:1
Fluid Type	Dexron III ATF
Fluid Capacity	5.0 L (drain and fill) / 9.0 L (total)

Final Drive

Model	Ratio	Type
633CSi (manual)	3.25:1	Open
633CSi (auto)	3.25:1	Open
635CSi (manual, early)	3.25:1	Open (LSD optional)
635CSi (manual, late)	3.07:1	Open (LSD optional)
635CSi (auto)	3.25:1	Open
M635CSi	3.25:1	25% limited-slip

Performance Specifications

Model	0-100 km/h	Top Speed	Standing 400m
630CS	9.7 sec	205 km/h	17.0 sec
633CSi (manual)	8.7 sec	215 km/h	16.3 sec
633CSi (auto)	10.0 sec	208 km/h	17.1 sec
635CSi (manual, Motronic)	7.4 sec	222 km/h	15.4 sec
635CSi (auto, Motronic)	8.8 sec	215 km/h	16.5 sec
M635CSi (manual)	6.4 sec	255 km/h	14.7 sec

Fuel Consumption (ADR Combined Cycle)

Model	Urban	Highway	Combined
630CS	16.5 L/100km	9.5 L/100km	12.5 L/100km
633CSi	16.0 L/100km	9.0 L/100km	12.0 L/100km
635CSi (Motronic)	15.5 L/100km	8.5 L/100km	11.5 L/100km
M635CSi	18.0 L/100km	10.0 L/100km	13.5 L/100km

Suspension Specifications

Front Suspension

Spec	Value
Type	MacPherson strut with coil springs
Anti-roll Bar	24 mm (standard) / 26 mm (M635CSi)
Dampers	Twin-tube hydraulic (standard) / Bilstein monotube (M635CSi)

Rear Suspension

Spec	Value
Type	Semi-trailing arm with coil springs
Anti-roll Bar	16 mm (standard) / 18 mm (M635CSi)
Dampers	Twin-tube hydraulic (standard) / Bilstein monotube (M635CSi)

Brake Specifications

Spec	Standard (635CSi)	M635CSi
Front	Ventilated disc, 286 x 22 mm	Ventilated disc, 300 x 28 mm
Rear	Solid disc, 272 x 10 mm	Ventilated disc, 284 x 20 mm
Front Caliper	Single-piston sliding	Four-piston fixed (ATE)
Rear Caliper	Single-piston sliding	Single-piston sliding
Servo	Vacuum assisted	Vacuum assisted
ABS	Optional from 1985 (Bosch ABS 2)	Standard

Wheels and Tyres

Model	Standard Wheels	Standard Tyres
630CS / 633CSi	14 x 6.5" alloy	195/70HR14
635CSi (early)	14 x 6.5" alloy	195/70HR14
635CSi (late)	16 x 7.0" alloy (Style 5)	205/55VR16
M635CSi	16 x 7.5" alloy (M-System)	225/50VR16

Electrical System

Spec	Value
Battery	12V, 80Ah
Alternator	Bosch 80A (standard) / 90A (M635CSi)
Starter Motor	Bosch 1.4 kW
Headlights	H4 halogen (4-lamp system)
Fuel Pump	Bosch electric, in-tank (injection models)

Interior Dimensions

Spec	Value
Front Headroom	960 mm
Rear Headroom	900 mm
Front Legroom	1,050 mm
Rear Legroom	800 mm
Front Shoulder Room	1,400 mm
Rear Shoulder Room	1,350 mm

Fluid Capacities

Fluid	Capacity	Specification
Engine Oil (M30)	5.5 L (with filter)	15W-40 mineral or 10W-40 semi-synthetic
Engine Oil (M88)	6.0 L (with filter)	10W-60 full synthetic
Coolant	11.5 L	BMW Blue (ethylene glycol) 50:50 with distilled water
Manual Gearbox	1.2 L	MTF-1 or GL-4 75W-90
Automatic Gearbox	5.0 L (drain/fill)	Dexron III ATF
Differential	1.2 L	75W-90 GL-5 (LSD: add friction modifier)
Power Steering	1.0 L	Dexron III ATF or CHF 11S
Brake Fluid	1.0 L (system)	DOT 4
Fuel Tank	70 L	98 RON unleaded

Production Numbers by Model

Model	Years	Approximate Production
630CS	1976-1979	3,691
628CSi	1979-1987	868
633CSi	1976-1984	20,929
635CSi	1978-1989	54,873
M635CSi	1984-1989	5,855
Total	1976-1989	~86,216