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Armstrong Siddeley logo

Armstrong Siddeley 18 Mk II

(1925 model)

Brief specs of 1925 Armstrong Siddeley 18 Mk II

petrol (gasoline) 6-cylinder 12-valve straight (inline) engine, OHV (overhead valve, I-head), 2872 cm3 / 175.3 cu in / 175.3 cu in, rear wheel drive, 106 km/h / 66 mph / 66 mph top speed

units: metric UK US

Basic (general) data

Marque (make)Armstrong SiddeleyIssued from1925
Model18 Mk IIIssued until
Serie18Number made
Model familyBody construction
Model codeBody designation
ManufacturerArmstrong SiddeleyCountryUK

Bodywork

Base platformNumber of doors
Bodywork typeNumber of seats
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

Length4267 mm / 168.0 in / 168.0 inTotal (curb) weight
Width1727 mm / 68.0 in / 68.0 inDry weight
HeightLoad capacity
Wheelbase3277 mm / 129.0 in / 129.0 inGross (max.) weight
Track frontTowing weight
Track rearWeight distribution (front)
Ground clearanceFuel capacity
Length/wheelbase ratio1.3  

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 constructionBore73.0 mm / 2.87 in / 2.87 in
Fuelpetrol (gasoline)Stroke114.3 mm / 4.50 in / 4.50 in
Fuel detailsBore/Stroke ratio0.64
Fuel supply1 Claudel-Hobson carbEngine displacement2872 cm3 / 175.3 cu in / 175.3 cu in
Engine Main bearingsUnitary capacity478.67 cm3/cylinder / 29.210 cu in/cylinder / 29.210 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio
SumpMax. output power at
AspirationnaturalMax. torque at
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)
CoolantwaterSpecific output
Catalytic converternoSpecific torque

Transmission

Transmission typeNumber of gears
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio5

Performance

Acceleration 0-50 mph (80 km/h)Top (maximal) speed106 km/h / 66 mph / 66 mph
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio
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, Cantilevernt
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 18 Mk II

Infobox

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