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This is original, contemporary technical data, including key differences:

ENGINE

Capacity
1558 cc (95.1cu in)
Type
Twin overhead camshaft
No of cylinders
4
Bore
82.55mm
Stroke
72.7mm
Compression ratio
10.3:1 (9.5:1 Federal)
Firing order
1-3-4-2 (No 1 at timing end)
Oil pressure (hot)
35/40lbs.sq. in
Distributor contact breaker gap
.014/.016in (.35/.40mm)
Performance
 
    Max BHP (net) @ rpm
126 @ 6500
    Emission
113 @ 6500
    Max torque @ rpm
113 lbs ft (15.622kg m) @ 5500
Cylinder head identification
N or H (S Federal)
Cylinder head depth
4.598/4.603 in (11.68/11.69 cm)
Max permissible metal removal
.010 in (.254mm)
Valve timing
 
    Inlet opens
26º BTDC
    Inlet closes
66º BTDC
    Exhaust opens
66º BTDC
   Exhaust closes
26º BTDC
Valve head diameter, inlet
1.560/1.566 in (39.624/39.776 mm)
Weber Carburettor 40 DCOE 31
 
Choke
33mm
Main jet
120
Air corrector jet
155
Accelerator pump jet
35
Dellorto Carburettor DHLA 40
 
Choke
33mm
Main jet
120 (135 European emission)
Main air corrector
130 (200 European emission)
Accelerator pump jet
35
Idling jet
50.02 (47L European emission)
Starter jet
70
Needle valve
150.33
Air trumpet length
42mm
Front – part number
Q026 S 0710W
Rear – part number
Q026 S 0711W
Ignition timing (static)
 
    Weber & Dellorto carburettors
12º BTDC
    Zenith-Stromberg (Federal)
12º BTDC
    Zenith-Stromberg (other territories)
9º BTDC
Sparking plugs - Type
 
    Weber & Dellorto carburettors
Champion N7Y
    Zenith-Stromberg (Federal)
Autolite AG.32
    Zenith-Stromberg (Federal above 85 mph)
Champion N7Y
    Zenith-Stromberg (other territories)
Champion N7Y
Sparking plugs - Gap
 
    Non-exhaust emission
.020/.023in (.508/.584mm)
    Exhaust emission
.025in (.635mm)
Valve clearances
 
    Inlet
.005/.007in (.127/.177mm)
    Exhaust
.009/.011in (.228/.279)
 
GEARBOX (TRANSMISSION)
Gearbox ratios (synchromesh on all forward gears)
 
    Top
1.000
    Third
1.397
    Second
2.010
    First
2.972
    Reverse
3.324
Rear axle ratio
3.55 or 3.77
Road speed per 1000 rpm in top
 
    3.77 final drive
17.62 mph (28.35 kph)
    3.55 final drive
18.50 mph (29.77 kph)
 
FRONT SUSPENSION
Front wheel toe-in
3/16th in (4.8mm) to 1/16th in (1.6mm)
Camber angle
0º to + 1º
Castor angle
3º to +/- 30º
Swivel pin inclination
9º to +/- 30º
 
REAR SUSPENSION
Rear wheel toe-in
3/16th in (4.8mm) to zero
Camber angle
1º to 0º
 
WHEELS AND TYRES
Wheels - Type
Pressed steel Lotus knock -on
    Size
4 ½ J
Tyres
 
 
Firestone F100 or Cavallino Sport 200
 
Goodyear G800
 
Dunlop SP Sport
    Size
155x13   (80 Profile)
Pressure (cold) – at speeds below 100mph
 
    Front
18lbs sq in (1.27 kg cm)
    Rear
23lbs sq in (1.62 kg cm)
Pressure (cold) – sustained speed over 100mph
 
    Front
24lbs sq in (1.69 kg cm)
    Rear
29lbs sq in (2.04 kg cm)
 
DIMENSIONS
Wheelbase
84in (213.4cm)
Track (at wheel hub)
 
    Front
47 3/32in (119.6cm)
    Rear
47 1/16in (119.5cm)
Overall
 
    Length
145in (368.3cm)
    Width
56in (142.2cm)
    Height
 
        Coupe
46 1/2in (118.0cm)
       Convertible
45 1/2in (115.6cm)
Design ground clearance
6in (15.2cm)
Turning circle
33ft 6in (10.2m)
Average kerb weight (unladen)
 
    Coupe
1550lbs (703kg)
    Convertible
1540lbs (698.5kg)
 
CAPACITIES
Fuel tank
9 ¼ gallons (11 US galls, 42 litres)
Engine (with filter) oil
7 ½ pints (9 US pints, 4 litres)
Gearbox oil
1 ¾ pints (2.1 US pints, .99 litres)
Rear axle oil
2 pints (2.4 US pints, 1.2 litres)
Cooling system (with heater)
14 pints (16.8 US pints, 7.9 litres)
Battery (negative earth)
12 volt 39 amp hr
 
SERVICING
First after sales service
500 miles (800 km)
A service
3000 miles (5000 km)
B service
6000 miles (10,000 km)
A service
9000 miles (15000 km)
C service
12000 miles (20,000 km)
And so on