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Armstrong Siddeley 25

(1937 model)

Brief specs of 1937 Armstrong Siddeley 25

4-door 5-seater sedan (saloon), petrol (gasoline) 6-cylinder 12-valve straight (inline) engine, OHV (overhead valve, I-head), 3670 cm3 / 224.0 cu in / 224.0 cu in, 63.4 kW / 85.0 hp / 85.0 hp @ 3500 rpm / 3500 rpm / 3500 rpm, Wilson pre-selector 4-speed transmission, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)Armstrong SiddeleyIssued from1937
Model25Issued until
Serie25Number made
Model familyBody construction
Model codeBody designation
ManufacturerArmstrong SiddeleyCountryUK

Bodywork

Base platformNumber of doors4
Bodywork typesedan (saloon)Number of seats5
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

Length4724 mm / 186.0 in / 186.0 inTotal (curb) weight1930 kg / 4255 lb / 4255 lb
Width1753 mm / 69.0 in / 69.0 inDry weight
HeightLoad capacity
Wheelbase3124 mm / 123.0 in / 123.0 inGross (max.) weight
Track front1448 mm / 57.0 in / 57.0 inTowing weight
Track rear1448 mm / 57.0 in / 57.0 inWeight distribution (front)
Ground clearance140 mm / 5.5 in / 5.5 inFuel capacity73 l / 16.0 UK gal / 19.2 US gal
Length/wheelbase ratio1.51  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)
Aerodynamic coefficient (Cd×A)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Engine

Engine CodeTotal number of cylinders6
Engine Typestraight (inline) Total number of valves12
Engine ManufacturerArmstrong-SiddeleyValves per cylinder2
Engine constructionBore82.5 mm / 3.25 in / 3.25 in
Fuelpetrol (gasoline)Stroke114.3 mm / 4.50 in / 4.50 in
Fuel detailsBore/Stroke ratio0.72
Fuel supply1 SU carbEngine displacement3670 cm3 / 224.0 cu in / 224.0 cu in
Engine Main bearingsUnitary capacity611.67 cm3/cylinder / 37.326 cu in/cylinder / 37.326 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio
SumpMax. output power63.4 kW / 85.0 hp / 85.0 hp at 3500 rpm / 3500 rpm / 3500 rpm
AspirationnaturalMax. torque at
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)25.4 kW / 34.0 hp / 34.0 hp (est.)
CoolantwaterSpecific output17.3 kW/l / 0.380 bhp/cu in / 0.380 bhp/cu in
Catalytic converternoSpecific torque

Transmission

Transmission typeWilson pre-selectorNumber of gears4
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio4.36

Performance

Acceleration 0-50 mph (80 km/h)Top (maximal) speed
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio44.0 kW/ton / 33.4 bhp/ton / 33.4 bhp/ton
Acceleration 0-100 km/hFuel consumption, City (urban)
Acceleration 0-100 mph (160 km/h)Fuel consumption, Road (extra-urban)
Acceleration 80-120 km/h (50-70 mph) in topFuel consumption, Mixed (combined)
Standing ¼mile time Fuel consumption, Euro
Standing kilometer time CO2 emissions
  Range

Chassis

Engine locationfrontEngine alignmentlongitudinal
SteeringSteering details
Turns lock-to-lockTurning circle
Suspension frontLive axle, Semi-elliptic leaf springsSuspension rearLive axle, Semi-elliptic leaf springs
Wheels frontWheels rear
Tyres frontTyres rear
Brakes frontBrakes rear
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Armstrong Siddeley 25

Infobox

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