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Napier 40/50

(1919 model)

Brief specs of 1919 Napier 40/50

4-door 5-seater sedan (saloon), petrol (gasoline) 6-cylinder 12-valve straight (inline) engine, SOHC (single overhead camshaft), 6105 cm3 / 372.5 cu in / 372.5 cu in, 61.1 kW / 81.9 hp / 81.9 hp @ 2000 rpm / 2000 rpm / 2000 rpm, manual 4-speed transmission, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)NapierIssued from1919
Model40/50Issued until
Serie40Number made
Model familyBody construction
Model codeBody designation


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

Dimensions & Weight

Length4572 mm / 180.0 in / 180.0 inTotal (curb) weight1880 kg / 4145 lb / 4145 lb
WidthDry weight
HeightLoad capacity
Wheelbase3480 mm / 137.0 in / 137.0 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 capacity
Length/wheelbase ratio1.31  


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 cylinders6
Engine Typestraight (inline) Total number of valves12
Engine ManufacturerNapierValves per cylinder2
Engine constructionBore101.6 mm / 4.00 in / 4.00 in
Fuelpetrol (gasoline)Stroke127.0 mm / 5.00 in / 5.00 in
Fuel detailsBore/Stroke ratio0.8
Fuel supply1 Napier-SU carbEngine displacement6105 cm3 / 372.5 cu in / 372.5 cu in
Engine Main bearings7Unitary capacity1017.50 cm3/cylinder / 62.092 cu in/cylinder / 62.092 cu in/cylinder
Cam DesignSOHC (single overhead camshaft)Compression ratio
SumpMax. output power61.1 kW / 81.9 hp / 81.9 hp at 2000 rpm / 2000 rpm / 2000 rpm
AspirationnaturalMax. torque at
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)24.4 kW / 32.8 hp / 32.8 hp (est.)
CoolantwaterSpecific output10.0 kW/l / 0.220 bhp/cu in / 0.220 bhp/cu in
Catalytic converternoSpecific torque


Transmission typemanualNumber of gears4
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio3.3


Acceleration 0-50 mph (80 km/h)Top (maximal) speed
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio43.6 kW/ton / 33.0 bhp/ton / 33.0 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, Semi-elliptic leaf springsSuspension rearLive axle, Cantilevernt
Wheels frontWheels rear
Tyres front895 x 135Tyres rear895 x 135
Brakes frontBrakes rear
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Napier 40/50


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