| MODEL | ARIEL MK1 SQUARE FOUR 1949 |
| Year | 1949 |
| Engine Type | — |
| Displacement / Capacity | 997 cc |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | 29.8 kW / 40 hp @ 5800 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | Carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | Expanding brake (drum), 178 mm / 7 in |
| Rear Brakes | Expanding brake (drum), 203 mm / 8 in |
| DIMENSION SPECS | |
| Overall Length | 2100 mm / 82.7 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1422 mm / 56 in |
| Ground Clearance | — |
| Dry Weight | 193 kg / 425.5 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 4-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 23 Litres / 6.1 US gal |
| Fuel Consumption | — |
| Top Speed | — |
A second database listing of the Ariel Square Four Mark I, with the same years as the 4G Square Four Mark I entry. The sheet gives the 997 cc OHV engine capacity, chain drive and drum brakes, but no further detail.
