Citroen DS21 group 2 (1966)
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Home » Rally Cars » Citroen DS21
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1970: Citroen DS21
1973: Citroen DS23
1974: Citroen CX2200
1977: Citroen CX2400 GTi

Specifications

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Click here for Electronic Fuel Injection version
Click here and here and here for street carburetor version

Group/Class 2 Homologation number: 5030, 5338 and 1583
Years active 1966-1973 Homologation start: 1/1/1966, 1/4/1970 and 1/1/1970
Homologation end: 1/1/1966, 1/4/1970 and 1/1/1970
Engine
Type Citroen DX2 (with carburetor), or DX3 (with injection), straight 4cyl, 4 stroke located front longitudinal behind front axle
Capacity 2175 cc WRC: 2175 cc
Bore x Stroke (mm) 90.0 x 85.5
Compression ratio 8.75:1, 9.0:1
Output power - torgue 109 HP @ 5500 rpm
1969: 115 HP @ 5750 rpm
1970 inj: 130 HP @ 5500 rpm
185 HP / 5500 rpm
18 kgm @ 3500 rpm
1969: 17.4 kgm @ 4000 rpm
1970 inj: 20 kgm @ 4000 rpm
24.7 kgm (242 Nm) / 3600 rpm
Main bearings forged steel crankshaft with 5 main bearings 64 mm diameter, big end bearings journal diameter 53.5mm steel connecting rod length between centers 160 mm, big end bearing tunnel diameter 57.7mm, aluminium alloy piston with 62.3 mm compression height, 1969: 65 mm (for 9.0:1) compression height
Materials block: cast iron cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers
Cams/valves overhead valves with pushrods and rockers (OHV), chain driven side camshaft 2 valves/cyl. - 8 valves total. 47 mm inlet valve diameter, 1969: 49 mm inlet valve diameter, 39 mm exhaust valve diameter. 2 coil springs per valve
Aspiration natural, DX2: x Weber 28/36 DDE carburetor, 1969: 1 x Weber 28/36 DLE or 28/36 DLEA1, or Solex 28/36 SFIF
DX3: Bosch D-Jetronic multipoint fuel injection
Ignition electronic, firing order 1-3-4-2
Cooling system jacketed watercooled with pump, radiator, 306 mm diameter-8 blades fan and thermostat 10.8 lt, 1970: 13 lt
Lubrication system wet sump 4.5 lt, 1969: 5 lt
Transmission
Type front wheel drive Citroen, 4 or 5 speed manual gearbox
Gearbox ratios 1st: 3.25/1 (39/12)
2nd: 1.941/1 (33/17) or 2nd: 1.833/1 (33/18)
3rd: 1.273/1 (28/22) or 1.207/1 (35/29)
4th: 0.852/1 (23/27)
R: 3.417/1 (41/22x22/12)
1969: R: 3.154/1 (41/22 x 22/13)
1971: 1st: 3.25/1 (39/12)
2nd: 1.941/1 (33/17)
3rd: 1.321/1 (37/28)
4th: 0.970/1 (32/33)
5th: 0.784/1 (29/37)
R: 3.154/1 (41/22x22/13)
1971: 1st: 3.25/1 (39/12)
2nd: 1.833/1 (33/18)
3rd: 1.206/1 (35/29)
4th: 0.852/1 (23/27)
5th: 0.757/1 (28/37)
R: 3.154/1 (41/22x22/13)
Diffrential ratio 4.857/1 (34/7), 4.375/1 (35/8) helical gears limited slip front differential
Clutch dry single disc, 225 mm disc diameter
Chassis-body
Type steel monocoque mounted on twin longeron main frame MA chassis with roll-cage. 4 door saloon steel bodyshell with steel bumbers
Front suspension upper and lower transverse arms with anti-dive geometry, hydropneumatic spring/damper units, anti-roll bar
Rear suspension trailing arms, hydropneumatic spring/damper units, anti-roll bar
Steering system rack and pinion with hydraulic servo assistance 3.5 turns lock to lock, 1969: 3.25 turns
Brakes front solid disks 300mm diameter with 2 piston calipers and 60 mm piston diameter, rear drums 255 mm diameter and 1 double piston caliper and 18mm piston diameter dual circuit with servo, adjustable ratio split front to rear
Dimensions
length: 4.838 m (190.5") width: 1.816 m (71.5") height: 1.470 m (57.9")
wheelbase: 3.125 m (123.0") front track: 5J: 1.500 m (59.1") or 5.5J: 1.516 m (59.7) rear track: 5J: 1.300 m (51.2") or 5.5J: 1.316 m (51.8)
Rims - tires steel rims 5" or 5.5" x 15" Michelin XAS 180 x 380 or 185-HR15
Weight 1250 kg front/rear distribution 65%-35%
Fuel tank 65 lt
Drag coefficient 0.38

Results in WRC

Races

Season
Entry Rally event
Driver
Codriver
Team M.C SVE
Entry list
S.R KEN A GRE RAC
entry list
Noël Pouderoux
R. Vincent
14th
Guy Verrier
Francis Murac
18th
Henri Ido Marang
Didier Nithart
26th
Jean-Luc Salomon
Saintigny
acci dent
Jean-Claude Ogier
Lucette Pointet-Ogier
brakes
Marcus Bryde
Aage Braein
dnf
Lavalle
Praty
dnf
Panah-Izadi
Genoc
dnf
Calcagno
GianMarco Cerchio
dnf
Viglietta
Pellizzeri
dnf*
Richard Bochnicek
Sepp-Dieter Kernmayer
11th
Wolfgang Petzl
Werner Schulz
dnf ?
Statistics
Others starts/finishes 12/4 8/3 2/1 1/0

*Group 1 entries


arton85.jpg Source
DS 21 Proto chassis court
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1966-ds21-1.jpg Source
1966 model

Drawings

1966-Citroen-DS-21-PALLAS-ikonoto-blueprint-poster-BB.jpg Source

Engine

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003g.jpg Source
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Suspension

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initialdave.com-01.jpg Source
Citroen DS19 Hydropneumatic suspension
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Pivot_Drawing.jpg Source
pumpsectional.jpg Source
Hydraulic pump for hydropneumatic suspension
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