Type
2S FHC
Number of doors
2
Wheelbase
2261 mm 89 in
Track: Front
1143 mm 45 in
Track: Rear
1219 mm 48 in
Length
3658 mm 144 in
Width
1524 mm 60 in
Height
1372 mm 54 in
Length:wheelbase ratio
1.62
Ground clearance
191 mm 7.5 in
Kerb weight
431 kg 950 lb
Fuel capacity
20.5 litres 4.5 UK Gal 5.4 US Gal
Bore
70.00 mm
Cylinders
S-2
Displacement
0.6 litre646 cc(39.421 cu in)
Compression ratio
6.50:1
Fuel system
1 Am carb
Maximum power(Net)
35.5 PS (35.0 bhp) (26.1 kW)@ 5700 rpm
Specific output
54.2 bhp/litre0.89 bhp/cu in
Maximum torque(Net)
49.0 Nm (36 ft?�·lb) (5 kgm)@ 3750 rpm
bmep
953.2 kPa (138.2 psi)
Specific torque
75.85 Nm/litre
Manufacturer
BSA
Coolant
Air
Bore/stroke ratio
0.83
Unitary capacity
323 cc/cylinder
Aspiration
Normal
Compressor type
N/A
Intercooler
None
Catalytic converter
N
Power-to-weight
81.21 bhp/ton
Engine location
Rear
Engine alignment
Unknown
Drive
RWD
Suspension
front I.CS.
Brakes F/R
Dr/Dr
Transmission
3M
Top gear ratio
1.00
Final drive ratio
4.90
RAC rating
6.1
year
1955
The Fairthorpe Atom Mark III is classed as a Small / Economy Cars by the majority of its drivers.