AC Cobra Mark III
|Production||1965 to 1967|
|Engine||427 cu in (7.0 L) V8 and 4.7 L (289 cu in)|
|Power||345 b.h.p. at 4,600 r.p.m.|
|Wheelbase||8 ft. (96 in.)|
|Length||14 ft. 6 in. (174 in.)|
|Width||5 ft. 7 in. (67 in.)|
|Height||4 ft. 3 in. (51 in.)|
|Top Speed||150 m.p.h.|
The AC Cobra Mark III was built in Britain from 1965 to 1967 with 4.7 L (289 cu in) V8 engine also some with 427 cu in (7.0 L) V8 .
By 1965 and Shelby began to drop the 7-litre Ford engine into an even thrther revised chassis. The basic min tube frame remained but the tubes grew bigger; still more important was the introduction of twin wishbone and coil-spring suspension at each corner replacing the transverse leaf springs. With Ford brain power behind Shelby, the installation
successful. but few were sold in Europe. With the termination of the A.C.Shelby contract and the sale of the name Cobra to Ford, A.C. were left a more than adequate chassis for the 4.7-litre engine: the same chassis, lengthened. provides the basis for the Frua bodied 42S convertible, a superb car in the luxury tradition of A.C.
The AC Cobra Mark III was built until 1967 The engine a V.8 high performance unit manufactured by Ford Motor Co. of America. The front suspension comprises twin wishbones by highly specialised thin wall casting techniques developed by Ford America to reduce weight. Identical to 428 Convertible, but wheelbase 6 in shorter. The new car also had wide wings and a larger radiator opening for cooling.
Traditional British sports body constructed in 16- and 18-gauge aluminium; leather trim, with carpets to choose. Demountable hood and tonneau; large luggage boot; fuel tank 15 Imp. gal.; spare wheel under luggage locker; maximum speed 150 m.p.h. Dimensions: weight 2,282 lb.; length 13 ft., width 5 ft. 8 in, height'4 ft. 1 in, with soft top erected; wheelbase 7 ft. 6 in., track, front 4 ft. 7 in., rear 4 ft. 6 in.
Inside Carpets are fitted to the floor and transmission tunnel and the seats are upholstered in leather; the door locks at the rear of the panel are operated by a simple leather pull-strap and you have to open the sidescreen and pull the strap to undo the door from the outside. There is a number of instruments on display, The wheel spokes obscure the lower edges of the speedometer and rev-counter the horn operation,a bar in the back of the indicator stalk. There is no padding on the painted metal facia top and its flat surface reflects on to the screen. There is a glove locker on the facia but the rest of the luggage has to go in the boot on top of the spare wheel with 3.9 cu.ft. of luggage space.
The soft hood is held on top of the screen by two pins in the centre which slide into a channel, and at the edges by over-centre clips. Press studs hold it down round the base of the hood, and there is a rubber sealing strip inside; tensioning is provided by a hoop hinged to the main arch. The fabric and the side screens fit into a bag.and takes around two minutes to put back up.Visibility is good with the soft top; the screen pillars are thin and there is plenty of clear sheet in the fabric. With the hood up there are few draughts until you move the sliding sidescreen forward, which is necessary in traffic. On the move you can get cold air in by ram effect at foot level; this is controlled by knobs at either end of the facia. For hot air you have to use the two-speed fan since the system is a recirculatory one; there are flaps at foot level and the screen outlets demist the screen quite quickly.
From 1953, the two-seater body has basically similar with a revised nose coming with the Zephyr engine option and ever wider wing flares along with an ever wider track. With 271 bhp in 21cwt of car, the 289 is extremely fast The unit is extremely tractable and it has an excellent gearbox. Although the cornering attitude of the car is largely dictated by the throttle at road speeds, the way the power is put through to the road, particularly on wet surfaces, is quite remarkable. it is not too impractical but a 15 mpg thirst and frequent servicing might put one off using it as a every day car. You are unlikely ever to get better than about 17 mpg which gives a usable range on the 15-gallon tank of about 220 miles.l
Engine: V.8 built by the Ford Motor Co. of America, 7,016 c.c. along with a high-performance engine also available, providing 400 bhp with single 4-barrel 780 CFM Holley carburettor. at 5,750 r.p.m. at extra cost.
Capacity 4,727 c.c. (289 cu. in.) with bore and stroke (4.00 x 2.87 (101.6 x 72.9 mm.) ,crankshaft carried on 4 main bearings, lead bronze bearing shells to mains and big ends, compression ratio 11:1, 4-choke Holley carburettor, 270 b.h.p. at 5,850 r.p.m. with 6,500 as recommended maximum; lubrication by pressure pump to bearings; aluminium pistons; Salisbury limited slip differential 3.54 ratio, Borg Warner 4-speed all synchromesh gearbox, ratios 2.20, 1.66, 1.31, 1.00; chassis, suspension, steering and brakes, identical to 428 Convertible, but wheelbase 6 in. shorter.
The gearbox has such excellent ratios and the short stubby gear lever. The pedals are well placed for heel-and-toeing and there is room for the left foot beside the clutch. resting on a piece of floor.The heavy clutch with a long travel itself grips smoothly and well but its long travel more final
drives are Salisbury 4HU with limited-slip differential.
PERFORMANCE: 289 cu in
- Fuel consumption: 19 ml imp gal, 15.8 ml us gal
- Max speed: 150 mph, 241.5 kmlh
- Max power (SAE): 270 hp at 5,750 rpm
- Max torque (SAE): 312 1b ft, 43.1 kg m at 3,400 rpm
- Max engine rpm: 7,000
- Specific power: 57 hp/l
- Power weight ratio: 7.9 lb/hp, 3.6 kg/hp
- Acceleration standing 1/4-mile 14 sec, 0—50 mph (O—80 km/h) 4 sec
AC Cobra Mark III Technical details and specifications (1965-1967)
ENGINE: 289 cu in
4 stroke; cylinders: 8, Vee-slanted at 90° aluminium pistons
bore and stroke: 4 X 2.87 in, 101.6 x 72.9 mm
engine capacity: 289 cu in, 4,735.84 cu cm
compression ratio: 11
cylinder block: cast iron
cylinder head: cast iron
crankshaft bearings: 5
valves: 2 per cylinder, overhead, in line, push-rods and rockers
camshafts: 1 , at centre of Vee
lubrication: rotary pump, full flow filter
carburation: 1 Ford downdraught 4-barrel carburettor
fuel feed: mechanical pump
cooling system: water, electric fan
ENGINE: (428 cu. in.)
bore and stroke of 4.13x3.98in.(104.9x 101.1mm.),
power 345 b.h.p. at 4,600 r.p.m.
compression ratio 10.25:1
4-choke Ford carburettor
lubrication by pressure pump to bearings
aluminium alloy pistons
Borg Warner 4-speed all synchromesh gearbox
driving wheels: rear
clutch: single dry plate
gearbox: ratios 1st 2.20 2nd 1.661, 3rd 1.311, 4th 1
gear lever location: central
final drive: hypoid bevel, Salisbury limited slip differential
axle ratio: 3.540.
front suspension: independent, wishbones, coil spring telescopic dampers
rear suspension: independent, wishbones, coil springs, traling radius arms, telescopic dampers.
turns of steering wheel lock to lock: 2.60.
turning circle (between walls) 34 ft, 10.4 m
disc (front diameter 11.75 in, 298 mm, rear 10.50 in, 267 mm)
area rubbed linings: total 580 sq in, 3,741 sq cm.
voltage: 12 V
battery: 57 Ah
generator type: altinator, 360 W
ignition distributor: Ford
DIMENSIONS AND WEIGHT
wheel base: 90 in, 2,286 mm
front track: 55 1,397 mm; rear track: 54 in, 1,372 mm
overall length: 156 in, 3,962 mm
over width: 68 in, 1,727 mm
overall height: 49 in, 1,245 mm
ground clearance: 6 in 152 mm
dry weight: 2,150 1b, 975 kg
distribution of weight: 51.5% front axle, 48.2 rear axle
© Motor car History
AC Cobra Mark III Maintenance and Service Guide (1965-1967)
The bonnet is retained by two top catches at the rear and hinges at the front end; it is easy to lift and is propped open by a single rod with a rubber tipped end. all the parts on the V 8 are easily accessible.The 289 needs servicing every 2,000 miles a comprehensive toolkit is provided. The jack has to fit under the chassis tubes or under the wishbones, but with a flat tyre there is little room to get it under.
Every 2.000 miles:
change engine oil, grease drive shaft joints, grease drive shaft splines, grease prop. shaft joints, check master cylinder reservoirs.
Every 4.000 miles:
change differential oil, change gearbox oil, grease steering pinion bearing, oil distributor. oil accelerator shaft, grease down and grovel underneath. handbrake nipples, oil carburetter linkages.
Every 10,000 miles:
inspect front and rear hub bearings and grease sparingly, oil dynamo front bearing, grease steering gaiter ends. Oc-
casionally oil wiper arm pivots, grease battery terminals, oil locks and hinges.
289 cu in
Fuel: 100 oct petrol
Engine sump oil: 9 imp 10.78 US pt, 5.1 1, SAE 20 (winter) 30 (summer), change every 2,000 miles, 3,200 kmh
Total lubricating system capacity: 10 imp pt, 12.05 US pt
Gearbox oil: 2.50 imp pt, 2.96 US pt, 1.4 1, SAE 90, change every 4,000 miles, 6 000km
Final drive oil: 2.50 imp pt, 2.96 US pt, 1.4 1, SAE 90, change every 4,000 m 6,400 km
Cooling system capacity: 18 imp pt, 21.56 US pt
Greasing: every 2,500 miles, 4,000 km, 9 points
Tappet clearances: inlet 0.018 in, 0.46 mm hot, exhaust 0.018 in, 0.46 mm hot
Valve timing: inlet opens 46° before tdc and closes 84° after bdc, exhaust opens 94° before bdc and closes 36°after tdc
Normal tyre pressure: front 26 psi, 1.8 atm, rear 28 psi, 2 atm.
Width of rims: 6" tyres 185 x 15
Fuel tank capacity: 15 imp gal, 17.9 US gal
Carrying capacity: 353 1b, 160 kg
© Motor car History
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