Austin Seven Opal 1937-39 specifications

Engine
4 Cylinder in line
Bearings: 3
Bore : 56mm
Stroke: 76 mm
Displacement: 747cc
Valves: 8, side
Compression ratio: 6to1
Carburation: Zenith 26VA
Power output: 17bhp at 3,800rpm

Ignition
6 volt coil,
14mm Champion L10 plugs

Performance
Maximum speed: 50.8 mph
Acceleration: 0-50 mph 58 secs
Overall fuel consumption: 45 mpg

Construction
Steel body on A-frame chassis

Transmission
Rear wheel drive
Clutch: single, dry plate
Gearbox: 4-speed, synchro on top 3
Rear wheel drive
Ratios: Top 5.25, 3rd 8.73,
2nd 13.85 1st 22.94 &
reverse 29.49 to 1
Propellar Shaft: torque tube
Rear axle: three quarter floating spiral bevel

Brakes
Mechanical, 7in drums

Steering
Worm and sector

Suspension
Front: Semi eliptic tranverse leaf
Rear: quarter eliptic leaf
Shock absorbers: friction type

Wheels & Tyres
17in Magna detachable wire
400 x 17in crossply

Dimensions & Weight
Wheelbase: 6ft 9in
Track - front: 3ft 4in
Track - rear: 4ft 7in
Overall length: 10ft 7in
Overall width: 4ft 3in
Overall height: 5ft 3in
Ground clearance: 6in
Turning circle: Left 38ft 2in
Kerb weight: 1358 lbs
Tank capacity: 5 gallons
Sump capacity: 4 pints