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Twenty-one/Twenty-five Series II/III 1936-9

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The picture shows a 1938 Series III Twenty-five saloon

Twenty-one and Twenty-five Series III

Engine
 
Twenty-one
Twenty-five

Number of cylinders

6
6
Bore mm
75
82
Stroke mm
110
110
Capacity cc
2916
3485
Valves
side
RAC hp rating
20.92
25.01
CR
 
BHP
 
90.3
at rpm
 
3800
Coolant
water
Carburation
SU
Dimensions
Wheelbase
10'1"
Track
48"
Length
15'11"
16'0"
Width
5'10"
5'10"
Weight cwt
30
31
Front suspension
half elliptic
Rear suspension
half elliptic
Axle ratio
4.54
4.45
Tyre size
600 x 17
Performance
0 to 50 mph secs
 
14.8
standing quarter secs
 
 
Fuel consumption mpg
 
16-20
Maximum speed
 
77
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