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Alfa Romeo RL Super Sport Castagna

(1925 model)

Brief specs of 1925 Alfa Romeo RL Super Sport Castagna

4-door 5-seater drophead coupé (convertible coupé), petrol (gasoline) 6-cylinder 12-valve straight (inline) engine, OISE (overhead inlet, side exhaust valve), 2994 cm3 / 182.7 cu in / 182.7 cu in, 61.9 kW / 83.0 hp / 83.0 hp @ 3600 rpm / 3600 rpm / 3600 rpm, manual 4-speed transmission, rear wheel drive, 130 km/h / 81 mph / 81 mph top speed

units: metric UK US

Basic (general) data

Marque (make)Alfa RomeoIssued from1925
ModelRL Super Sport CastagnaIssued until
SerieRLNumber made304
Model familyBody construction
Model codeBody designation
ManufacturerFiat GroupCountryIT,BR,ZA


Base platformNumber of doors4
Bodywork typedrophead coupé (convertible coupé)Number of seats5
Bodywork designerCastagnaCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

Length4450 mm / 175.2 in / 175.2 inTotal (curb) weight1600 kg / 3527 lb / 3527 lb
Width1870 mm / 73.6 in / 73.6 inDry weight
Height1630 mm / 64.2 in / 64.2 inLoad capacity
Wheelbase3140 mm / 123.6 in / 123.6 inGross (max.) weight
Track front1440 mm / 56.7 in / 56.7 inTowing weight
Track rear1440 mm / 56.7 in / 56.7 inWeight distribution (front)
Ground clearanceFuel capacity
Length/wheelbase ratio1.42  


Drag coefficient (Cd, Cx, Cw)Frontal area (A)2.59 m2 / 27.9 sq ft / 27.9 sq ft (est.)
Aerodynamic coefficient (Cd×A)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)


Engine CodeTotal number of cylinders6
Engine Typestraight (inline) Total number of valves12
Engine ManufacturerAlfa RomeoValves per cylinder2
Engine constructioncast iron blockBore76.0 mm / 2.99 in / 2.99 in
Fuelpetrol (gasoline)Stroke110.0 mm / 4.33 in / 4.33 in
Fuel detailsBore/Stroke ratio0.69
Fuel supply2 Ze carbsEngine displacement2994 cm3 / 182.7 cu in / 182.7 cu in
Engine Main bearingsUnitary capacity499.00 cm3/cylinder / 30.451 cu in/cylinder / 30.451 cu in/cylinder
Cam DesignOISE (overhead inlet, side exhaust valve)Compression ratio5.5 : 1
SumpMax. output power61.9 kW / 83.0 hp / 83.0 hp at 3600 rpm / 3600 rpm / 3600 rpm
AspirationnaturalMax. torque at
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)24.8 kW / 33.2 hp / 33.2 hp (est.)
CoolantwaterSpecific output20.7 kW/l / 0.454 bhp/cu in / 0.454 bhp/cu in
Catalytic converternoSpecific torque


Transmission typemanualNumber of gears4
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio


Acceleration 0-50 mph (80 km/h)Top (maximal) speed130 km/h / 81 mph / 81 mph
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio51.9 kW/ton / 39.3 bhp/ton / 39.3 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


Engine locationfrontEngine alignmentlongitudinal
SteeringSteering details
Turns lock-to-lockTurning circle
Suspension frontLive axle, Leaf springSuspension rearLive axle, Leaf spring
Wheels frontWheels rear
Tyres front5.50 x 19Tyres rear5.50 x 19
Brakes frontdrumBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Alfa Romeo RL Super Sport Castagna


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