Info
Alfa Romeo GTA 1300 Junior
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Production | 1968 to 1975 |
Class | Sports car |
Body style | 2-door coupe |
Engine | 1.3 L straight-4 |
Wheel base | 92.52 in, 2,350 mm |
Overall length | 160.63 in, 4,080 mm |
Overall width | 62.20 in, 1,580 mm |
Overall height | 51.77 in, 1,315 mm |
Ground cleance | 4.72 in, 120 mm |
Top Speed | Production: 108.7 mph, 175 km/h Autodelta: 130.5 mph, 210 km/h. |
The GTA 1300 Junior was a sports car built from 1968 to 1975 by Alfa Romeo.
History
The GTA 1300 Junior had a 1300 cc engine that was based on the 1600 engine but with a short stroke crankshaft. The GTA Junior in stradale form did not have many of the light weight features of the 1600 GTA, such as the plastic windows, magnesium engine components and alloy wheels. At start the engine produced 96 PS (71 kW; 95 hp) but was soon raised to 110 PS (81 kW; 110 hp). Autodelta prepared fuel injected racing cars had 165 PS (121 kW; 163 hp). 450 GTA Juniors were produced.
In June 1968, Alfa Romeo decided to replace the Sprint GTA with its successor, with a lower displacement but equally successful, the GTA 1300 Junior, which was built until 1975.
The car is the evolution of the 1600 with the addition of the brake booster and a new 1290 cm³ engine which in the road version delivers 96 HP at 6000 rpm and 12.1 Kgm at 5000 rpm but because it has a short stroke of 67.5 mm it was therefore capable of turning to much higher performance. The aesthetic changes were limited to new decals instead of the small triangular sticker with a green four-leaf clover on the front fenders, a large four-leaf clover and a stripe on the sides, a large snake on the hood and the sticker with the official name on the trunk in white on red body and green on white body. The rims remained in sheet steel as on the GT Junior.
In addition, Autodelta decided to homologate and market the version developed for competitions, equipped with a 145 HP engine at 7200 rpm and 14 kgm at 6500 rpm with Weber 45 DCOE carburettors and enlarged fiberglass mudguards placed on Dunlop Racing tires on rims with 9 "channel together with all the necessary precautions to race just after leaving the dealer. With the adoption of the" narrow "cylinder head (valves angled to each other in a" V "of 45 °) with single ignition and in 1971 the indirect mechanical injection power supply, the power increased to 150-160 hp and in 1974 even to 170-180 hp on the few examples equipped with a 16-valve cylinder head and dry sump oil system.
- PERFORMANCE
engine capacity 78.72 cu in, 1,290 cu cm
max speed 108.7 mph, 175 km/h
max power (SAE): 110 hp at 6,000 rpm
max torque (SAE): 96 1b ft, 13.3 kg m at 5,000 rpm
specific power: 85.3 hp/l
max speeds: 27.3 mph, 44 km/h in 1st gear; 46 mph, 74 kn
in 2nd gear; 67 mph, 108 km/h in 3rd gear; 90.7 mph, 146 km/h in 4th gear; 108 mph, 175 km/h in 5th gear - Autodelta, special version
Autodelta comp engine
max power (SAE) 160 hp at 7,800 rpm
specific power 124 hp/l
max speed 130.5 mph, 210 km/h.
Technical
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Alfa Romeo GTA 1300 Junior Technical details and specifications (1968-1975)
ENGINE
location front, 4 stroke
cylinders: 4, vertical, in line
bore and stroke: 3.07 x 2.66 in, 78 x 67.5 mm
engine capacity: 78.72 cu in, 1,290 cu cm
compression ratio: 9
cylinder block: light alloy, wet liners
cylinder head: light alloy, hemispherical combustion chambers
crankshaft bearings: 5;
valves: 2 per cylinder, overhead, Vee-slanted, thimble tappets
camshafts: 2, overhead
lubrication: gear pump, full flow filter
carburation: 2 Weber 45 DCOE 14 horizontal twin barrel carburettors
fuel feed: 2 electric pumps
cooling system: water
TRANSMISSION:driving wheels: rear
clutch: single dry plate
gearbox: mechaical 5 plus reverse
gearbox synchromes all
gearbox ratiosI 2.540, II 1.700, III 1.260, IV 1, V 0.860, rev 3.010
gear lever location: central
final drive: hypoid bevel
axle ratio: 4.555BRAKES
disc (diameter 10.51 in, 267 mm), servoELECTRICAL EQUIPMENT
voltage: 12 V
battery: 24 Ah
generator type:
dynamo, 300 W
ignition distributors: 2STEERING
recirculating ball or worm and roller
turns of steering wheel lock
turning circle (between walls): 35.1 ft, 10.7 mCHASSIS
type integral
front suspension: independent, wishbones, coil springs, anti-roll bar, telescopic dampers
rear suspension: rigid axle, trailing lower radius arms, upper transverse vee radius arm, coil springs, anti-roll bar, telescopic dampers.DIMENSIONS AND WEIGHT
wheel base: 92.52 in, 2,350 mm
front track 52.13 in, 1,324 mm
rear track: 50.16 in, 1,274 mm
overall length: 160.63 in, 4,080 mm
overall width: 62.20 in, 1,580 mm
overall height: 51.77 in, 1,315 mm
ground cleance: 4.72 in, 120 mm© Motor car History
Service
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Alfa Romeo GTA 1300 Junior Maintenance and Service Guide (1968-1975)
Fuel type: 98-100 oct petrol
Engine oil change: 10.91 imp pt, 13.11 US pt, 6.2 1, SAE 20W-40, change every 3,700 miles, 6,000 km
Lubricating system capacity: 11.79 imp pt, 14.16 US pt
Cooling system capacity: 13.20 imp pt, 15.85 US pt
Gearbox oil: 2.82 imp pt, 3.38 US pt, 1.6 1, SAE 90 EP, change every 11,200 miles, 18,000 km
Final drive oil: 2.11 imp pt, 2.54 US pt. 1.2 1, SAE 90 EP, change every 11,200 m 18,000 km
Greasing: every 3,700 miles, 6,000 km, 3 points
Tappet clearances: 0.019-0.020 in, 0.47-0.50 mm, exhaust 0.020-0.022 in, 0.52-0.55 mm
Valve timing: opens 36°50' before tdc and closes 60°50' after bdc, exhaust opens 54°10' before bdc and closes 30°10' after tdc
Normal tyre pressure: front 24 psi, 1.7 atm, 26 psi, 1.8 atm.
Width of rims: 5.5 in
Tyres: 165 x 15
Fuel tank capacity: 10.1 imp gal, 12.1 US gal© Motor car History
Maintenance
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