Ariel Square Four 4G 1000, Mark I, Mark II (1936-48) vs Ariel Arrow Super Sport 250 (1961-62)
Comparison technical specifications
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| Make: | Ariel | Ariel |
| Model: | Square Four 4G 1000, Mark I, Mark II | Arrow Super Sport 250 |
| Years: | 1936-48 | 1961-62 |
| Engine: | Four stroke, vertical square four, OHV, 8 valves | Two stroke, parallel twin |
| Capacity: | 997 cc / 60.8 cu in | 247 cc / 15.1 cu in |
| Bore x Stroke: | 65 x 78 mm | 54 x 54 mm |
| Cooling System: | Air cooled | Air cooled |
| Compression Ratio: | 6.0:1 | 10:1 |
| Exhaust: | Mk I, Mk II: 2 x 2-into-1 | 2-into-2 |
| Induction: | SU carburetor | 1-1/16 in Amal 376 carburettor |
| Starting: | Kick start | Kick |
| Max Power: | F4 G, Mk I: 26 kW / 35 hp @ 5500 rpm Mk II: 34 kW / 45 hp @ 5500 rpm | 14.9 kW / 20 hp 2 6500 rpm |
| Transmission: | 4-Speed | 4-Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Telescopic fork | Trailing link fork |
| Rear Suspension: | Plunger-link spring | Swing arm, twin shock absorbers/dampers |
| Front Brakes: | Drum | Drum, 6 in, leading shoe |
| Rear Brakes: | Drum | Drum, 6 in, leading shoe |
| Wheels: | Steel, laced wire spokes | Steel, laced wire spokes |
| Wheelbase: | 1422 mm / 56 in | 1300 mm / 51 in |
| Dry Weight: | 4G: 211 kg / 465 lbs Mk I: 197 kg / 435 lbs Mk II: 193 lg: 425 lbs | 132 kg / 290 lbs |
| Fuel Capacity: | 23 L / 6.0 US gal | 13.6 L / 3.6 US gal |
| Top Speed: | 4G: 141 km/h / 87 mph Mk I: 145 km/h / 90 mph Mk II: 160 km/h / 100 mph | 126 km/h / 78 mph |