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Roamer 4-75 E

(1926 model)

Brief specs of 1926 Roamer 4-75 E

4-door 5-seater touring car (tourer), petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, 5584 cm3 / 340.8 cu in / 340.8 cu in, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)RoamerIssued from1926
Model4-75 EIssued until
Serie4-75Number made
Model familyBody construction
Model codeBody designation


Base platformNumber of doors4
Bodywork typetouring car (tourer)Number of seats5
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

LengthTotal (curb) weight
WidthDry weight
HeightLoad capacity
Wheelbase3251 mm / 128.0 in / 128.0 inGross (max.) weight
Track frontTowing weight
Track rearWeight distribution (front)
Ground clearanceFuel capacity76 l / 16.7 UK gal / 20.0 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 CodeG ITotal number of cylinders4
Engine Typestraight (inline) Total number of valves8
Engine ManufacturerRochester DuesenbergValves per cylinder2
Engine constructionBore108.0 mm / 4.25 in / 4.25 in
Fuelpetrol (gasoline)Stroke152.4 mm / 6.00 in / 6.00 in
Fuel detailsBore/Stroke ratio0.71
Fuel supply1 Stromberg carburettorEngine displacement5584 cm3 / 340.8 cu in / 340.8 cu in
Engine Main bearings3Unitary capacity1396.00 cm3/cylinder / 85.189 cu in/cylinder / 85.189 cu in/cylinder
Cam DesignCompression 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 typeNumber of gears
Wheel driverear wheel driveTop gear (drive) ratio
  Final gear (drive) ratio4.45


Acceleration 0-50 mph (80 km/h)Top (maximal) speed
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


Engine locationfrontEngine alignmentlongitudinal
SteeringSteering details
Turns lock-to-lockTurning circle
Suspension frontSuspension rear
Wheels frontWheels rear
Tyres front33 x 4.5Tyres rear33 x 4.5
Brakes frontBrakes rear
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Roamer 4-75 E


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