 Source |
Development chain 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 |
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Table of Contents
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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 compression height. 18R-G: 46 mm 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 |
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| 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
| 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
Source