Toyota Celica RA20 GT2000 group 2 (1976)
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Home » Rally Cars » Toyota Celica RA20
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1971: Toyota Celica TA22
1972: Toyota Celica RA20
1978: Toyota Celica RA40 GT2000
1988: Toyota Celica ST165 GT4
1992: Toyota Celica ST185 4WD Turbo
1994: Toyota Celica ST205 GT4
Development level
Group 4
Group 2

Specifications

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Torque settings

18R-G Cylinder head 7.2-8.8kgm (52.1-63.7ftlb) Camshaft bearing cap 1.6-2.2kgm (12-15ftlb) Camshaft timing gear 7.0-8.0kgm (50.6-57.9ftlb) Camshaft drive gear 6.0-7.0kgm (43.4-50.6ftlb) Intake manifold 1.0-1.6kgm (7.2-11.6ftlb) Exhaust manifold 3.5-4.5kgm (25.3-32.6ftlb) Crankshaft bearing cap 10.0-11.0kgm (72.3-79.6ftlb) Connecting rod cap 6.4-7.0kgm (46.3-50.6ftlb) Oil pan 1.0-1.6kgm (8-12ftlb) Crankshaft pulley 8.2-8.8kgm (59.3-63.7ftlb)

Common settings

Bore x Stroke 88.5x80mm Displacement 1968cc Inlet valve clearance - hot 0.20mm (0.008") Exhaust valve clearance - hot 0.36mm (0.014") Timing 18R 10° BTDC at 600rpm Timing 18R-C auto 5° BTDC at 650rpm Timing 18R-C manual 5° BTDC at 750rpm Timing 18R-E 10° BTDC at 850rpm Timing 18R-G(R) auto 5° BTDC at 1000rpm Timing 16R manual 7° BTDC at 700rpm Timing 16R auto 7° BTDC at 750rpm Timing 16R-B 10° BTDC at 800rpm Firing order 1-3-4-2 Idle speed 750 ± 50 rpm Fast idle speed 2600 ± 200 rpm Manifold vacuum at idle 420mm Hg (16.5" Hg) Compression - standard 11.5kg/cm² (163.1psi) Compression - minimum 9.0kg/cm² (127.8psi) Compression - max difference between cylinders 1.0kg/cm² (14.2psi) Spark plug 18R Denso W20EP, NGK BP6ES Spark plug 18R-G(R) Denso W20EX, NGK BP6EZ Spark plug gap 18R 0.7mm-0.8mm (-0.03") Spark plug gap 18R-G(R) 0.9mm-1.0mm Max spark plug lead resistance 25kOhm Distributor heel gap 0.45mm Distributor damping spring gap 0.1-0.4mm (0.004"-0.168") Dwell angle 50°-54° Dwell variation 3° Ignition timing 7° BTDC/750±50rpm

Engines

Group 1
Homologation number 5437 5437, 5576 and 5636 and transfer group A
Homologation start 1/1/1972 1/1/1972, 1/10/1974, 2/8/1976
Homologation end 31/12/1981
Model RA20 1900 GT 2000: RA21 (5437), RA25 Liftback (5576), RA23/RA28 (5636)
Engine Type Toyota 8R Toyota 18R Toyota 18R-G since 1/10/1973
Bore x Stroke (mm) 86.0 x 80.0 88.5 x 80.0
Capacity (cc) 1858 cc 1968
Compression 9.0:1 8.5:1 9.4-9.7:1
Cylinderhead cast iron with "wedge" shape combustion chamber aluminium alloy with hemishperical combustion chamber
Valves SOHC, I43, E34 SOHC, I41, E36 DOHC, I45, E37
Aspiration 1 x AISAN 8R 1 x AISAN 18R 2 x Mikuni 18R-G
Spark plugs Denso W20EP, NGK BP6ES Denso W20EX, NGK BP6EZ
Power output 100 HP @ 5500 rpm 105 HP @ 5500 rpm 145 HP @ 6400 rpm
Torque 15 kgm @ 3600 rpm 16 kgm @ 3800 rpm 18 kgm @ 5200 rpm
Years active 1972-1977
Engine
Type Toyota 18R-G, straight 4cyl, 4 stroke, petrol engine located front longitudinal
Capacity 1998 cc WRC: 1998 cc
Bore x Stroke (mm) 89.0 mm x 80.0
Compression ratio 11.5:1
Output power - torgue 180 HP @ 6800 rpm 220 Nm @ 5000 rpm
Main bearings forged steel crankshaft with 5 main bearings 60mm diameter big end bearing internal diameter 53mm, aluminium alloy piston with 40 mm piston compression height. 18R-G: 46 mm piston compression height
Materials block: cast iron cylinderhead: aluminium alloy with hemishperical combustion chamber
Cams/valves double overhead camshaft (DOHC), chain driven 2 valves/cyl. - 8 valves total. 45mm inlet valve diameter, 37mm exhaust valve diameter. 1 coil springs per valve
Aspiration natural, 2 x Mikuni 18R-G carburetor
Ignition electronic, firing order 1-3-4-2. Spark plugs: Denso W20EX, NGK BP6EZ
Cooling system jacketed watercooled with pump, radiator, 360 mm diameter-6 blades fan and thermostat. 1975: 380 mm x 6 blades 7.4 lt, 18R-G: 8.5 lt
Lubrication system wet sump, 1973, group 2: dry sump 4.3 lt. 1973: dry sump with 8.4 lt
Transmission
Type rear wheel drive Toyota W50 or P51, 5 or 4 speed manual gearbox
Gearbox ratios constant: 1.435/1 (30/19)
1st: 3.579/1 (34/15)
2nd: 2.081/1 (29/22)
3rd: 1.397/1 (23/26)
4th: 1.00/1
R: 4.399/1 (39/31 x 31/14)
1975: constant: 1.45/1 (29/20)
1st: 3.29/1 (34/15)
2nd: 2.04/1 (31/22)
3rd: 1.39/1 (25/26)
4th: 1.00/1
5th: 0.85/1 (20/34)
R: 4.04/1 (39/31 x 31/14)
1975: constant: 1.348/1 (31/23)
1st: 3.53/1 (34/13)
2nd: 2.05/1 (32/21)
3rd: 1.40/1 (29/28)
4th: 1.00/1
5th: 0.86/1 (21/33)
R: 3.76/1 (39/31 x 31/14)
1977 group 2, W50: constant: 1.45/1 (29/20)
1st: 2.26/1 (28/18)
2nd: 1.51/1 (27/26)
3rd: 1.18/1 (22/27)
4th: 1.00/1
5th: 0.88/1 (20/33)
R: 4.04/1 (39/31 x 31/14)
1977 group 2, P51: constant: 1.16/1 (29/25)
1st: 2.63/1 (34/15)
2nd: 1.64/1 (31/22)
3rd: 1.21/1 (26/25)
4th: 1.00/1
5th: 0.86/1 (23/31)
R: 3.23/1 (39/31 x 31/14)
Diffrential ratio 3.70/1 (37/10), 1975: 3.91/1 (43/11), 4.88/1 (39/8),
1976: 3.73/1 (41/11), 4.56/1 (41/9)
1977, group 2: 5.13/1 (41/8), 5.38/1 (43/8)
hypoid spiral bevel gears rear differential. 1973: limited slip differential
Clutch dry single plate 210mm diameter.
1973, group 2: twin plate 184 mm diameter.
1976, single plate 227 mm diameter
Chassis-body
Type steel monocoque RA23 or RA28 chassis of Toyota A platform. 2 door hardtop coupe (RA23) or liftback (RA28 and RA25) bodyshell. Group 2: front and rear plastic spoiler, extended wheel arches
Front suspension mcpherson strut with lower wishbone, coil springs, telescopic shock absorbers and anti roll bar
Rear suspension live axle with 4 longitudinal radius links, coil springs and telescopic shock absorbers
Steering system recirculating ball (no servo) 3.5 turns lock to lock. 1973, group 2: 3 turns
Brakes Front solid disc 228 mm diameter with 1 piston caliper 47.6 mm piston diameter. Rear drums 229 mm diameter with 1 double piston caliper 17.5 mm piston diameter. 1978, group 2: rear ventilated disc 230 mm diameter with 2 piston calipers 41.3 mm piston diameter dual circuit with vacuum servo
Dimensions
length: 4.215 m (165.9") width: 1.620 m (63.8"), group 2: +100 mm height: 1.290 m (50.8")
wheelbase: 2.425 m (95.5") front track: 1.280 m (50.4") rear track: 1.285 m (50.6")
Rims - tires 4.5J or 5J x 13", 1976, RA23/28: 5.5J x 14"
Weight 930-980 kg
Fuel tank 50-58 lt

Results in WRC

Races

Works team: Team Toyota

Season
Entry Rally event
Driver
Codriver
Team M.C SVE KEN GRE MAR POR FIN S.R TdC RAC
Ove Andersson
Arne Hertz
works eng ine
Hannu Mikkola
Jean Todt
works distri butor
Jean-Pierre Mari
de Susini
18th*
Roger Touquet
Micheline Touquet-Escavi
dnf
F-J Galgani
R Dominici
dnf
Teruo Katsuta
Kiroki Uchiyama
dnf*
Stewart Morgan
Geoff Jennings
dnf*
Statistics
Others starts/finishes 7/1 3/1 4/0

*Group 1 entries


Drawings

Suspension

suspension.gif Source
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