Type
7S TOUR
Number of doors
4
Wheelbase
3302 mm 130 in
Track: Front
1422 mm 56 in
Track: Rear
1422 mm 56 in
Kerb weight
1703 kg 3754 lb
Bore
88.90 mm
Cylinders
S-6
Displacement
5 litre4968 cc(303.166 cu in)
Fuel system
1 Rayfield carburettor
Maximum power
72 PS (71 bhp) (52.9 kW)@ 2600 rpm
Specific output
14.3 bhp/litre0.23 bhp/cu in
Manufacturer
National
Main bearings
3
Coolant
Water
Bore/stroke ratio
0.67
Unitary capacity
828 cc/cylinder
Aspiration
Normal
Compressor type
N/A
Intercooler
None
Catalytic converter
N
Power-to-weight
41.69 bhp/ton
Engine location
Front
Engine alignment
Longitudinal
Drive
RWD
Steering
worm & gear
Suspension
front
Tyres: Front
32 x 4½
Tyres: Rear
32 x 4½
Transmission
3 speed manual
Top gear ratio
1.00
Final drive ratio
4.08
RAC rating
29.4
year
1921
National Sextet touring car with a V-12 engine and the Jackson Six were popular vehicles at the 20th annual show.