Lotus Seven Register - Series Four Page

LOTUS SEVEN REGISTER

the web site for the

Seven made by Lotus between 1957 and 1973

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Series Four Page

~ Original Specifications ~

WHEN PRODUCED:
Circa March 1970 to August 1973 then by Caterham Cars.

CHASSIS NUMBER SEQUENCE:
S4/2650 to S4/331(?). Left hand drive cars had the prefix 'LBS4' or 'LS4'

NUMBERS PRODUCED:
66? plus 37 by Caterham Cars.

CHASSIS:
Mild steel tubular structure with fabricated stressed steel side panels and front section.

BODY:
Pigmented glass fibre bonded centre section bolted to chassis. Seperate front wings and front hinged bonnet.

FRONT SUSPENSION:
Pressed steel double wishbone with coil spring damper units plus anti-rollbar.

REAR SUSPENSION:
'Live' axle located by leading and trailing links, lateral location by wishbones, coil spring damper units control ride.

STANDARD ENGINES AND GEARBOXES:
1600cc. FORD 2255E overhead valve engine with crossflow head and Weber 32DFM twin choke progressive down-draught carburettor in standard tune (GT Cortina) developing 84bhp at 5,500rpm. Compression 9.0:1. Ford semi-close ratio 4-speed all synchromesh gearbox and Ford gearknob. 2.97:1, 2.01:1, 1.40:1, 1:1, Reverse 3.32:1.

1558cc. LOTUS TWIN-CAM engine with twin 40DCOE Weber carburettors in standard Special Equipment tune (115bhp) as an optional extra using the same gearbox and as above but the Lotus-Holbay version (126bhp)

REAR AXLE:
Ford 'live' rear axle with 3.77:1 ratio.

BRAKES:
Front are Girling (Triumph Spitfire) hydraulically operated 9" disc type. Rear are hydraulically operated 8 1/2" - 9" drums. Mechanical handbrake.

STEERING:
Rack and pinion, 2 3/4 turns lock to lock, collapsible column, 13" alloy spoke wheel with PVC rim.

WHEELS AND TYRES:
5 1/2" x 13" pressed steel 'bolt-on' rims with chromium plated hub-caps. 5 1/2" x 13" light alloy 'bolt-on' rims (Brand Lotus) at extra cost. All with either 165 x 13 Dunlop SP Sport or Goodyear G800 radial tyres as standard.

ELECTRICS:
12 volt negative earth battery located in the boot. [Extract from a Lucas Catalogue]

INSTRUMENTS:
(All by Smiths.) Speedometer, Tachometer, Oil Pressure Guage, Water Temperature Guage, Ammeter and Fuel Guage.

TRIM:
Black pile carpets and black ventilated interior trim, seat squabs and back rest.

MISCELLANEOUS:
7 1/2 gallon steel fuel tank.

EX-WORKS PRICES (from factory ephemera):
Circa 1970/1 - Seven GT Basic (Ford 225E powered) - Ł945.00
Circa 1970/1 - Seven S/E De Luxe (Ford 225E powered) - Ł995.00
Circa 1970/1 - Seven Holbay Clubman (Ford 225E Holbay powered) - Ł1295.00
Circa 1970/1 - Seven Twin Cam (Lotus Ford Twin Cam powered) - Ł1245.00

EXTRAS:
On All Models: Screen Washer; Heater; Air Horns; Repeater Flashers; Roll Over Bar; Tonneau Cover; Seat Belts; Tool Kit; Light Alloy Wheels by Lotus (Brand Lotus?); Hardtop.

DIMENSIONS:
Overall Length 146.3", Overall Width 60.5", Overall Height (Top of Hood) 44", Overall Height (Top of Screen) 41.5", Front Track 48.8", Rear Track 51.5", Ground Clearance 6.5".

WEIGHT:
Laden 1310lbs. (Twin-Cam Version).