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Alfa Romeo 20/30 HP ES Sport

(1921 model)

Brief specs of 1921 Alfa Romeo 20/30 HP ES Sport

4-door 5-seater sedan (saloon), petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, side valves (flathead, L-block, L-head), 4750 cm3 / 289.9 cu in / 289.9 cu in, 50.0 kW / 67.1 hp / 67.1 hp @ 2600 rpm / 2600 rpm / 2600 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 from1921
Model20/30 HP ES SportIssued until
Serie20Number made124
Model familyBody construction
Model codeBody designation
ManufacturerFiat GroupCountryIT,BR,ZA

Bodywork

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

Dimensions & Weight

Length4700 mm / 185.0 in / 185.0 inTotal (curb) weight1200 kg / 2646 lb / 2646 lb
Width1780 mm / 70.1 in / 70.1 inDry weight
Height1700 mm / 66.9 in / 66.9 inLoad capacity
Wheelbase2800 mm / 110.2 in / 110.2 inGross (max.) weight
Track front1450 mm / 57.1 in / 57.1 inTowing weight
Track rear1450 mm / 57.1 in / 57.1 inWeight distribution (front)
Ground clearanceFuel capacity
Length/wheelbase ratio1.68  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)2.57 m2 / 27.7 sq ft / 27.7 sq ft (est.)
Aerodynamic coefficient (Cd×A)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Engine

Engine CodeTotal number of cylinders4
Engine Typestraight (inline) Total number of valves8
Engine ManufacturerAlfa RomeoValves per cylinder2
Engine constructioncast iron blockBore102.0 mm / 4.02 in / 4.02 in
Fuelpetrol (gasoline)Stroke130.0 mm / 5.12 in / 5.12 in
Fuel detailsBore/Stroke ratio0.78
Fuel supply1 Ze carbEngine displacement4750 cm3 / 289.9 cu in / 289.9 cu in
Engine Main bearingsUnitary capacity1187.50 cm3/cylinder / 72.466 cu in/cylinder / 72.466 cu in/cylinder
Cam Designside valves (flathead, L-block, L-head)Compression ratio4.5 : 1
SumpMax. output power50.0 kW / 67.1 hp / 67.1 hp at 2600 rpm / 2600 rpm / 2600 rpm
AspirationnaturalMax. torque at
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)20.0 kW / 26.8 hp / 26.8 hp (est.)
CoolantwaterSpecific output10.5 kW/l / 0.231 bhp/cu in / 0.231 bhp/cu in
Catalytic converternoSpecific torque

Transmission

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

Performance

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 ratio55.8 kW/ton / 42.3 bhp/ton / 42.3 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
  Range

Chassis

Engine locationfrontEngine alignmentlongitudinal
SteeringSteering details
Turns lock-to-lockTurning circle
Suspension frontLive axle, Leaf springSuspension rearLive axle, Leaf spring
Wheels frontWheels rear
Tyres front820 x 120Tyres rear820 x 120
Brakes frontBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Alfa Romeo 20/30 HP ES Sport

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