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Napier 8 G20

(1900 model)

Brief specs of 1900 Napier 8 G20

petrol (gasoline) 2-cylinder 4-valve straight (inline) engine, OISE (overhead inlet, side exhaust valve), 2436 cm3 / 148.7 cu in / 148.7 cu in

units: metric UK US

Basic (general) data

Marque (make)NapierIssued from1900
Model8 G20Issued until
Serie8Number made
Model familyBody construction
Model codeBody designation


Base platformNumber of doors
Bodywork typeNumber of seats
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

LengthTotal (curb) weight1143 kg / 2520 lb / 2520 lb
WidthDry weight
HeightLoad capacity
Wheelbase2153 mm / 84.8 in / 84.8 inGross (max.) weight
Track front1257 mm / 49.5 in / 49.5 inTowing weight
Track rear1257 mm / 49.5 in / 49.5 inWeight distribution (front)
Ground clearanceFuel capacity
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 Typestraight (inline) Total number of valves4
Engine ManufacturerNapierValves per cylinder2
Engine constructionBore101.6 mm / 4.00 in / 4.00 in
Fuelpetrol (gasoline)Stroke152.4 mm / 6.00 in / 6.00 in
Fuel detailsBore/Stroke ratio0.67
Fuel supply1 Napier carbEngine displacement2436 cm3 / 148.7 cu in / 148.7 cu in
Engine Main bearingsUnitary capacity1218.00 cm3/cylinder / 74.327 cu in/cylinder / 74.327 cu in/cylinder
Cam DesignOISE (overhead inlet, side exhaust valve)Compression 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 driveTop gear (drive) ratio
  Final gear (drive) ratio


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 alignment
SteeringSteering details
Turns lock-to-lockTurning circle
Suspension frontLive axle, Semi-elliptic leaf springsSuspension rearLive axle,E Leaf spring
Wheels frontWheels rear
Tyres frontTyres rear
Brakes frontBrakes rear
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Napier 8 G20


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