Ariel Square Four (4G:1936-48MkI:1949-53MkII:1953-58)

Make Model: Ariel Square Four 4G 1000, Mark I, Mark II


Year: 4G: 1936 – 48 Mk I: 1949 – 53 Mk II: 1953 – 58
Production: 4G: 4 288 Mk I: 3 922 Mk II: 3 828
Engine: Four stroke, vertical square four, OHV, 8 valves
Capacity: 997 cc / 60.8 cu in
Bore x Stroke: 65 x 78 mm
Cooling System: Air cooled
Compression Ratio: 6.0:1
Exhaust: Mk I, Mk II: 2 x 2-into-1
Induction: SU carburetor
Starting: Kick start
Max Power: F4 G, Mk I: 26 kW / 35 hp @ 5500 rpm Mk II: 34 kW / 45 hp @ 5500 rpm
Transmission: 4-Speed
Final Drive: Chain
Frame: Single down tube
Front Suspension: Telescopic fork
Rear Suspension: Plunger-link spring
Front Brakes: Drum
Rear Brakes: Drum
Wheels: Steel, laced wire spokes
Dimensions: Length: 2100 mm / 82 in
Wheelbase: 1422 mm / 56 in

Dry Weight: 4G: 211 kg / 465 lbs Mk I: 197 kg / 435 lbs Mk II: 193 lg: 425 lbs
Fuel Capacity: 23 L / 6.0 US gal
Top Speed: 4G: 141 km/h / 87 mph Mk I: 145 km/h / 90 mph Mk II: 160 km/h / 100 mph


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