Austin Big Seven Data
(CRV - Sixlite and CRW - Forlite Models)

Already the Big Seven has become a firm favourite in the small car market, its lively performance, comfort and economy, being chiefly responsible.

The latest Big Seven incorporates a number of improvements including a new method of rear spring anchorage giving extra stability, while the bodywork is now equipped with running boards (introduced July 1938) and, on de luxe models, a steel-panel sliding roof.  These features add to the appearance and provide greater protection.

The engine of the Big Seven, with its counter-balanced crankshaft, inclined valves, and downdraught carburation, is one of the most lively and efficient small units yet produced, and for a combination of performance and accommodation with extreme economy, the Big Seven has no  equal.  High averages without fatigue, or pleasant pottering about are equally within the capabilities of this Austin.

The Big Seven range offers the choice of two- or four-door saloons, with or without a sliding roof.

From Publication No.1677/2


Dimensions Full car length 11ft 2in (3,404mm);
Full car width 4ft 6in (1,371mm); 
Height 5ft 4in (1,625mm);
Wheelbase 7ft 3½in (2,223mm);
Track front 3ft 7in (1,095mm), rear 3ft 9in (1,143mm);
Ground clearance 5¾in (146mm);
Turning circle 36ft 0in (10,973mm).
Engine Four-cylinder water cooled with detachable head.
Bore 2.235in (56.77mm), Stroke 3.5in (88.9mm);  3 main bearings.
Cubic capacity 900cc
Brake horsepower 25 at 4,000 rev.  RAC rating 7.99hp
Ignition: Coil.
Oil circulation: By full pressure gear pump.
Oil capacity (sump) 5 pints.
Cooling: Thermo-syphon with film radiator and fan. 
Cooling system capacity 13 pints.
There is a spring-loaded valve in top tank to prevent overflow by splash.
Crankshaft bearings; Three, steel-backed white metal.
Starter Electrical with cable control to switch.
Clutch Flexible single plate, spring loaded, the plate carrying the friction rings.
Gearbox Four speeds forward, and a reverse. The top, third and second gears have synchromesh engagement, which ensures smooth, noiseless gear changes to suit varying speeds. 
First gear is a low one to be used when starting with full load, up an incline, or manoeuvring the car in an awkward place.
The ratios of engine to road wheels are: top 5.125 to 1; third, 8.51 to 1; second, 13.53 to 1, and first 22.4 to 1; reverse 28.8 to 1. 
Ball bearings throughout. 
Oil capacity 1½ pints.
Rear Axle Three-quarter-floating, with differential and torque tube.  Ball bearings and thrusts throughout. 
Final drive by shaft and helical bevel. 
Oil capacity 7/8 pint.
Springs Semi-elliptical transverse spring in front.
Quarter elliptics at rear.
Friction shock absorbers are fitted to front and rear.
Brakes Girling wedge and roller on all four wheels with individual adjustment.
Wheels Pressed steel spoke.  One spare wheel with tyre. 
Tyres 4.75 x 16 (E.L.P.) Dunlop.
Controls Ball change-speed gear lever, and brake lever, mounted centrally. 
Foot control for dip-and-switch headlights. 
Foot accelerator.
Fuel Feed Six gallon (26½ litres) tank at rear. 
Fuel supply by A.C. pump.
Lighting By belt-driven fan ventilated dynamo, with 6-volt battery and compensated voltage control.
Bodywork Separate front seats for driver and passenger with easy individual, adjustment.  Rear seat to carry two adults or three children. 
Ample tool accommodation. 
Spare wheel and tyre. 
Equipment includes illuminated instruments, electric horn, speedometer, automatic return direction indicators, electric windscreen wiper, driving mirror and licence holder.
Luggage Platform Maximum permissible load, 56lbs.


Tools and Accessories

Double open-ended spanners:
3/16" x ¼" ; 5/16" and 3/8" ; 7/16" and ½".
Box spanner 3/16" x ¼" and tommy bar.
Spanner for tappet screw.
Combination pliers.
Sparking plug and tappet clearance gauge.
Ignition gauge and screwdriver.
Ignition key.
Lifting jack, with handle.
Tyre Levers.
Tyre pump.
Wheel brace.
Starting handle.
Grease gun complete.
Envelope containing Austin literature.

Jack handle is stored under rear seat cushion.

This list is subject to modification from time to time.


From Handbook of the Austin Big Seven Publication No 1523D, September 1938.
The Austin Motor Co Ltd., Birmingham, Longbridge.


See also:

The Big Seven Lubrication Chart

The Big Seven (4 door) Wiring Diagram

The Big Seven (2 door) Wiring Diagram

Austin Big Seven Handbooks

Notes on Big Seven Maintenance etc.

Austin Big Seven - Maintenance Data

Austins Introduce a Big Seven  From The Light Car, July 16, 1937.

Austin Big Seven Saloon   From The Motor August 3 1937.

The Austin Big Seven 2door (Forlite)   From Practical Motorist, July 16 1938.

The Austin Big Seven   From The Light Car, January 7, 1938.  


Also relevant to the Big Seven are:

Lucas RF 95 Control Unit (RF 95 Regulator/Cut-out)

Renewing Timing Chains