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Armstrong Siddeley Star Sapphire

(1958 model)

Brief specs of 1958 Armstrong Siddeley Star Sapphire

4-door 5-seater sedan (saloon), petrol (gasoline) 6-cylinder 12-valve straight (inline) engine, OHV (overhead valve, I-head), 3990 cm3 / 243.5 cu in / 243.5 cu in, 108.1 kW / 145.0 hp / 145.0 hp @ 4250 rpm / 4250 rpm / 4250 rpm, 312.0 N·m / 230.1 lb·ft / 230.1 lb·ft @ 2000 rpm / 2000 rpm / 2000 rpm, automatic 3-speed transmission, rear wheel drive, 160 km/h / 99 mph / 99 mph top speed

units: metric UK US

Basic (general) data

Marque (make)Armstrong SiddeleyIssued from1958
ModelStar SapphireIssued until
SerieStar SapphireNumber 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)5290 l / 186.81 cu ft / 186.81 cu ftMax. cargo capacity (volume)

Dimensions & Weight

Length4930 mm / 194.1 in / 194.1 inTotal (curb) weight1778 kg / 3920 lb / 3920 lb
Width1880 mm / 74.0 in / 74.0 inDry weight
Height1575 mm / 62.0 in / 62.0 inLoad capacity
Wheelbase2896 mm / 114.0 in / 114.0 inGross (max.) weight
Track front1470 mm / 57.9 in / 57.9 inTowing weight
Track rear1460 mm / 57.5 in / 57.5 inWeight distribution (front)
Ground clearance216 mm / 8.5 in / 8.5 inFuel capacity73 l / 16.0 UK gal / 19.2 US gal
Length/wheelbase ratio1.7  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)2.52 m2 / 27.1 sq ft / 27.1 sq ft (est.)
Aerodynamic coefficient (Cd×A)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Engine

Engine CodeTotal number of cylinders6
Engine Typestraight (inline) (Inline, 6 cylinder)Total number of valves12
Engine ManufacturerArmstrong-SiddeleyValves per cylinder2
Engine constructionBore97.0 mm / 3.82 in / 3.82 in
Fuelpetrol (gasoline)Stroke90.0 mm / 3.54 in / 3.54 in
Fuel detailsBore/Stroke ratio1.08
Fuel supply2 Ze carbsEngine displacement3990 cm3 / 243.5 cu in / 243.5 cu in
Engine Main bearingsUnitary capacity665.00 cm3/cylinder / 40.581 cu in/cylinder / 40.581 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio7.5 : 1
SumpMax. output power108.1 kW / 145.0 hp / 145.0 hp at 4250 rpm / 4250 rpm / 4250 rpm
AspirationnaturalMax. torque312.0 N·m / 230.1 lb·ft / 230.1 lb·ft at 2000 rpm / 2000 rpm / 2000 rpm
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)15.1 kW / 20.3 hp / 20.3 hp (est.)
CoolantwaterSpecific output27.1 kW/l / 0.595 bhp/cu in / 0.595 bhp/cu in
Catalytic converternoSpecific torque78.2 N·m/l / 0.68 lb·ft/cu in / 0.68 lb·ft/cu in

Transmission

Transmission typeautomaticNumber of gears3
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio3.77

Performance

Acceleration 0-50 mph (80 km/h)11.30 s / 11.30 s / 11.30 sTop (maximal) speed160 km/h / 99 mph / 99 mph
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio81.5 kW/ton / 61.8 bhp/ton / 61.8 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
Steeringrack & pinion PASSteering details
Turns lock-to-lock3.8Turning circle11.6 m / 38.1 ft / 38.1 ft
Suspension frontIndependent, Wishbone (A-arm, control arm), Coil springsSuspension rearLive axle, Semi-elliptic leaf springs
Wheels frontWheels rear
Tyres frontTyres rear
Brakes frontdiscBrakes reardisc
Brake diameter frontBrake diameter rear
Brakes detailsservo-assistedBraked area

Technical specifications and performance data of Armstrong Siddeley Star Sapphire

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