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Maxwell Model A Junior Runabout

(1904 model)

Brief specs of 1904 Maxwell Model A Junior Runabout

2-seater roadster, petrol (gasoline) 2-cylinder 4-valve flat (horizontally opposed, boxer) engine, 1647 cm3 / 100.5 cu in / 100.5 cu in, 7.5 kW / 10.1 hp / 10.1 hp, manual 2-speed transmission, rear wheel drive, 56 km/h / 35 mph / 35 mph top speed

units: metric UK US

Basic (general) data

Marque (make)MaxwellIssued from1904
ModelModel A Junior RunaboutIssued until
SerieModel ANumber made
Model familyBody construction
Model codeBody designation


Base platformNumber of doors
Bodywork typeroadsterNumber of seats2
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

LengthTotal (curb) weight499 kg / 1100 lb / 1100 lb
WidthDry weight
HeightLoad capacity
Wheelbase2083 mm / 82.0 in / 82.0 inGross (max.) weight
Track front1422 mm / 56.0 in / 56.0 inTowing weight
Track rear1422 mm / 56.0 in / 56.0 inWeight distribution (front)
Ground clearanceFuel capacity38 l / 8.3 UK gal / 10.0 US gal
Length/wheelbase ratio  


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


Engine CodeTotal number of cylinders2
Engine Typeflat (horizontally opposed, boxer) Total number of valves4
Engine ManufacturerMaxwellValves per cylinder2
Engine constructionBore101.6 mm / 4.00 in / 4.00 in
Fuelpetrol (gasoline)Stroke101.6 mm / 4.00 in / 4.00 in
Fuel detailsBore/Stroke ratio1
Fuel supplyEngine displacement1647 cm3 / 100.5 cu in / 100.5 cu in
Engine Main bearingsUnitary capacity823.50 cm3/cylinder / 50.253 cu in/cylinder / 50.253 cu in/cylinder
Cam DesignCompression ratio
SumpMax. output power7.5 kW / 10.1 hp / 10.1 hp at
AspirationnaturalMax. torque at
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)3.0 kW / 4.0 hp / 4.0 hp (est.)
CoolantwaterSpecific output4.5 kW/l / 0.100 bhp/cu in / 0.100 bhp/cu in
Catalytic converternoSpecific torque


Transmission typemanualNumber of gears2
Wheel driverear wheel driveTop gear (drive) ratio
  Final gear (drive) ratio


Acceleration 0-50 mph (80 km/h)Top (maximal) speed56 km/h / 35 mph / 35 mph
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio20.0 kW/ton / 15.2 bhp/ton / 15.2 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 frontSuspension rear
Wheels frontWheels rear
Tyres front28 x 3Tyres rear28 x 3
Brakes frontBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Maxwell Model A Junior Runabout


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