Mitsubishi Colt Galant A50 group 2 (1970)
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1970: Mitsubishi Colt Galant A50
1988: Mitsubishi Galant E39A VR4

GTO history

Specifications

MR: 850 units built
Click here for 1.4 lt street version
Click here for Hardtop
Engine service

1597cc
158hp

Group 1 2 1 2 1
Homologation number 5346 and 5426 5426 1/1V 5464 5468 5485 1653 5346 4/3V and
5468 1/1V
Homologation start 1/4/1970 and 1/10/1971 1/10/1971 1/4/1972 1/7/1972 1/12/1972 1/7/1973 1/8/1973
Homologation end 31/12/1980 31/12/1981 31/12/1978 31/12/1980 and
31/12/1981
Model Colt Galant GTO A53C and A52/A53 (4 door) Colt Galant GTO-MR A53C Chrysler Dodge Colt A53HUL2 Colt Galant Hard Top A53H Colt Galant GTO A55C Colt Galant Hard Top 1700 A55H GSR
Engine Type 4G32 4G32-1-90A 4G32 4G35 4G32
Bore x Stroke (mm) 76.9 x 86.0 79.0 x 86.0 76.9 x 86.0
Capacity (cc) 1597 1686 1597
Compression 8.5:1 9.5:1 8.5:1 9.5:1
Valves SOHC, I38, E31 DOHC, I41, E36 SOHC, I38, E31
Aspiration 1 x Mikuni 28-32 DIDSA 2 x Mikuni 40 PHH 1 x Mikuni 28/32 DIDTA-13 2 x Mikuni 28-32 DIDSA 2 x Mikuni 28-32 DIDSA or
28-32 DIDTA
Power output 100 HP @ 6300 rpm 124 HP @ 6800 rpm 100 HP @ 6300 rpm 115 HP @ 6500 rpm 110 HP @ 6700 rpm
Torque 14.0 kgm @ 4000 rpm 14.5 kgm @ 5000 rpm 14 kgm @ 4000 rpm 15.2 kgm @ 4500 rpm 14.2 kgm @ 4800 rpm
Engine
Main bearings 5 of 57mm. 1653: 58 mm diameter. Big end bearings journal 45mm big end bearing 48mm diameter, aluminium piston 34 mm (MR: 36mm and 5464: 32mm, 4G35: 33mm) compression height. Piston rings 2/2/4mm, piston pin 19mm diameter
Materials block: cast iron, 87.5 mm bore spacing cylinderhead: cross flow aluminium alloy with hemispherical combustion chambers
Cams/valves single overhead camshaft (SOHC), chain driven 2 valves/cyl. - 8 valves total, 38 mm inlet valve diameter, 31 mm exhaust valve diameter
Ignition electronic, firing order 1-3-4-2, 12V battery
Cooling system jacketed watercooled with pump, radiator, 320 mm diameter-4 blades (A53: 325mm diameter-6 blades and 5464: 330mm diameter-6 blades, 4G35: 340mm diameter-7blades) fan and thermostat 6 lt, Dodge Colt: 6.6 lt
Lubrication system wet sump 4 lt
Transmission
Type rear wheel drive Mitsubishi, 4 or 5 speed manual gearbox
Gearbox ratios constant: 1.706/1 (29/17)
1st: 3.53/1 (31/15)
2nd: 2.19/1 (27/21)
3rd: 1.44/1 (22/26)
4th: 1.00/1
R: 3.87/1 (34/15 x 15/15)
Dodge Colt, only this gearbox		 constant: 1.556/1 (28/18)
1st: 3.22/1 (31/15)
2nd: 2.00/1 (27/21)
3rd: 1.43/1 (23/25)
4th: 1.00/1
R: 3.53/1 (34/15 x 15/15)		 Group 2: constant: 1.55/1 (31/20)
1st: 3.20/1 (33/16)
2nd: 2.04/1 (29/22)
3rd: 1.27/1 (23/28)
4th: 1.00/1
5th: 0.85/1 (18/33)
R: 3.72/1 (36/10 x 16/15)		 1973: constant: 1.238/1 (26/21)
1st: 3.24/1 (34/13)
2nd: 1.96/1 (30/19)
3rd: 1.34/1 (26/24)
4th: 1.00/1
5th: 0.85/1 (20/29)
R: 3.08/1 (37/19 x 19/15)		 1973: constant: 1.136/1 (25/22)
1st: 2.97/1 (34/13)
2nd: 1.79/1 (30/19)
3rd: 1.33/1 (27/23)
4th: 1.00/1
5th: 0.85/1 (21/28)
R: 2.80/1 (37/19 x 19/15)
Diffrential ratio 3.89/1 (35/9), 4.22/1 (38/9) hypoid spiral bevel gears rear differential
Clutch dry single plate 202mm diameter, MR: 217mm
Chassis-body
Type steel monocoque Mitsubishi A53C/A55C (GTO), A53H/A55H, Chrysler 6H23-K25 (1972 Coupe), Chrysler 6H23-K45 (1975 Coupe) chassis. 2 door coupe or 4 door saloon bodyshell. Group 2: extended wheel arches
Front suspension mcpherson strut with lower A wishbone, coil springs, telescopic shock absorbers and anti roll bar
Rear suspension live axle with leaf springs and telescopic shock absorbers. MR: with 2 small upper 45o longitudinal radius arms
Steering system recirculating ball (no servo) 3.5 turns lock to lock
Brakes front solid discs 239 mm diameter with 2 piston caliper 48.1 mm piston diameter. Rear drums 228mm diameter with 1 double piston caliper 19 mm piston diameter. 5468 & 1653: rear drums 203mm diameter with 1 double piston caliper 20.6mm diameter
1653: front solid discs 229 mm diameter with 1 piston caliper 51.1 mm diameter		 dual circuit with vacuum servo
Dimensions
length: 4.125 m (162.3") width: 1.580 m (62.2"), group 2: +100 mm height: 1.330 m (53.3")
wheelbase: 2.420 m (95.3") front track: 1.290 m (50.6") rear track: 1.290 m (50.6")
Rims - tires 4J or 4.5J x 13"
Weight 855-865 kg, A55C: 885 kg, A55C: 915 kg
Fuel tank 45 lt. A55C: 55 lt

Chrysler Dodge Colt

Dimensions
length: 4.059 m (159.8") width: 1.570 m (61.8") height: 1.370 m (54.1")
wheelbase: 2.413 m (95.0") front track: 1.285 m (50.6") rear track: 1.285 m (50.6")
Rims - tires 4J x 13"
Weight 918 kg
Fuel tank 50 lt

4G32-1-90A

Engine Transmission Model 4G32-1-90A
Number and arrangements of Cylinders 4 in-line longitudinal
Method of cooling Water
Operation cycles 4
Combustion chamber type semi-spherical
Valve Arrangement Double overhead valve type
Bore and Stroke 76.9 x 86
Total Displacement 1597
Compression ratio 9.5:1
Compression pressure 125psi @ 250rpm
Maximum output 125ps @ 6800rpm
Overall dimensions 616 x 615 x 666 mm (L x H x W)
Engine weight with accessories 142 kg
Crankshaft
Main bearings 56.980/57.000mm, run clearance 0.015-0.070mm
tunnel 61.000/61.020mm diameter.
Big end bearings journal 44.991/45.000mm, run clearance 0.010-0.060mm
big end bearing 48.000/48.020mm mm diameter
end play 0.050-0.170mm
camshaft end play 0.075-0.150mm
camshaft journal diameter 34mm
Piston type solid
Valves
intake length 105.9mm
Exhaust length 102.5mm
Intake stem dia. 8mm
Exhaust stem dia. 8mm
No. of piston rings 2 (compression) 1 (oil rings), 2/2/4mm thickness
Valve timing Intake opens – B.T.D.C. 32º
Valve timing Intake closes – A.B.D.C. 52º
Valve timing Exhaust opens – B.B.D.C. 52º
Valve timing Exhaust closes – A.T.D.C. 32º
Valve Clearance Intake – 0.30mm, (0.20mm hot)
Valve Clearance Exhaust – 0.30mm (0.25mm hot)
No-load speed rpm 800 to 850
Starting method Starting motor type
Blow-by gas removing system Closed
Ignition method Battery ignition
Ignition timing 18º B.T.D.C. @ 800 rpm
Firing order 1-3-4-2
Ignition coil type TB63
Distributor type TVG- 4CR
Performance of spark advancer Centrifugal type – 0º/500rpm, 16º/2000rpm
Performance of spark advancer Vacuum type – 0º/40mmHg, 20º/160mmHg
Spark plugs Type – BP6ES (NGK)
Spark plugs Thread – 14mm
Spark plugs Plug Gap – 0.7 to 0.8mm
Carburettor Type – Solex type with idle limiter
Carburettor Model – 40PHH
Carburettor Gas valve diameter – 40mm
Carburettor Venturi diameter – 32mm
Carburettor Choke type – Manual choke type
Fuel pump Electromagnetic type
Oil pump type Geared pump type
Oil capacity 5.0 litre

Torque values
LOCATION FT. LB.
Main brg.caps 36-39
Rod brg.caps 23-25
Cyl. head bolts 59
Cam sprocket bolt 36-43
Crank pulley bolt 80-94
Flywheel bolt 94-101 mounting
Flywheel housing
Manifold bolt & nut 10-14
Oil pan bolt 4.3-5.8
Oil pan drain plug 43-57
Oil pump bolt 11-13
Rocker arm nut
Rckr.shaft brckt.bolt
Timing cover
Spark plug 15-22
Water outlet bolt
Water pump bolt
Wtr.pmp.pulley bolt

Results in WRC

Races

Season
Entry Rally event
Driver
Codriver		 Team M.C SVE KEN MAR GRE A S.R USA RAC
Entry list
S. Harvey (Dodge Colt) dnf
'Dimi'
'Andy'		 dnf*
Jim Doidge (Dodge Colt)
Harry Ward III		 Samida Racing 5th
Tom Samida (Dodge Colt)
Brian Fox		 Samida Racing dnf* tie rod
Paul McLennan (Dodge Colt)
Tom Grimshaw		 Samida Racing tie rod
Total points
()		 6 6
Statistics
Others starts/finishes 6/1 3/0 3/1

*Group 1 entries

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page revision: 92, last edited: 27 Dec 2019 02:23
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