Ariel 4G Square Four Mark II 1957 - Specifications & Review
Article Complete Info
| Articleid | 281340 |
|---|---|
| Category | Allround |
| Make | Ariel |
| Model | 4G Square Four Mark II |
| Year | 1957 |
Chassis, Suspension, Brakes & Wheels
| Frametype | Full cradle |
|---|---|
| Frontbrakes | Expanding brake (drum brake) |
| Frontbrakesdiameter | 178 mm (7.0 inches) |
| Frontsuspension | Oil damped telescopic fork |
| Fronttyre | 3.25-19 |
| Rearbrakes | Expanding brake (drum brake) |
| Rearbrakesdiameter | 203 mm (8.0 inches) |
| Rearsuspension | Plunger-link spring |
| Reartyre | 4.00-18 |
| Wheels | Wire spoked. Dunlop tyres. |
Engine & Transmission
| Borexstroke | 65.0 x 78.0 mm (2.6 x 3.1 inches) |
|---|---|
| Compression | 6.0:1 |
| Coolingsystem | Air |
| Displacement | 995.00 ccm (60.71 cubic inches) |
| Enginedetails | Square four cylinder |
| Enginetype | Double twin cylinder arranged as a square. |
| Fuelconsumption | 3.04 litres/100 km (32.9 km/l or 77.38 mpg) |
| Fuelsystem | Carburettor. SU MC2 carburettor with air cleaner |
| Gearbox | 4-speed |
| Greenhousegases | 70.5 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Lubricationsystem | Dry sump with dual oil pump. |
| Power | 45.00 HP (32.8 kW)) @ 5500 RPM |
| Topspeed | 160.0 km/h (99.4 mph) |
| Transmissiontypefinaldrive | Chain |
| Valvespercylinder | 2 |
Other Specifications
| Coloroptions | Red/chrome |
|---|---|
| Comments | Also called ´Squariel´. Designed by Edward Turner. Mark II has separate barrels, a re-designed cylinder head with four separate exhaust pipes from two cast-aluminium manifolds and a rocker-box combined with the inlet manifold. |
| Light | 7.5 inch, 30 Watt headlamp. |
| Starter | Kick |
Physical Measures & Capacities
| Fuelcapacity | 18.93 litres (5.00 gallons) |
|---|---|
| Groundclearance | 140 mm (5.5 inches) |
| Oilcapacity | 3.40 litres (0.22 quarts) |
| Overalllength | 2,184 mm (86.0 inches) |
| Overallwidth | 686 mm (27.0 inches) |
| Weightincloilgasetc | 197.3 kg (435.0 pounds) |
About Ariel 4G Square Four Mark II 1957
Introducing the 1957 Ariel 4G Square Four Mark II
The 1957 Ariel 4G Square Four Mark II, affectionately known by enthusiasts as the “Squariel,” is a striking example of mid-20th century British motorcycle engineering. Positioned in the allround category, it was aimed at riders seeking both performance and versatility. Designed by the renowned Edward Turner, this motorcycle not only turned heads with its unique square four engine configuration but also captivated riders with its blend of style and practicality. With its classic red and chrome finish, the 4G Square Four Mark II stands as a timeless symbol of the era, appealing to both collectors and those nostalgic for the golden age of motorcycling.
At the heart of the Squariel lies a robust 995cc square four-cylinder engine, generating a respectable 45 horsepower at 5,500 RPM. This power translates into a top speed of 160 km/h (99.4 mph), allowing riders to experience exhilarating performance on the open road. The engine's design, featuring a compression ratio of 6.0:1 and a dual-valve setup per cylinder, provides a smooth and responsive ride. Paired with a 4-speed gearbox and chain final drive, the Ariel 4G delivers a pleasant balance of power and efficiency, boasting an impressive fuel consumption rate of just 3.04 liters per 100 km (77.38 mpg). Riders can expect a spirited performance, whether navigating city streets or enjoying a long countryside cruise.
The 1957 model showcases innovative engineering that was ahead of its time. The redesigned cylinder head features separate barrels, allowing for effective heat dissipation and improved performance. The inclusion of four distinct exhaust pipes enhances airflow, ensuring that the engine runs efficiently. The full cradle frame offers stability and comfort, complemented by an oil-damped telescopic front fork and a plunger-link spring rear suspension that absorbs road imperfections. Safety is not overlooked, as the expanding drum brakes—measuring 178 mm in the front and 203 mm in the rear—provide reliable stopping power. With a fuel capacity of 18.93 liters, riders can embark on longer journeys without the constant need for refueling.
#### Pros and Cons of the 1957 Ariel 4G Square Four Mark II
Pros:
- Unique Engine Design: The square four-cylinder configuration not only enhances performance but also gives the motorcycle a distinctive character.
- Excellent Fuel Efficiency: With a consumption rate of 77.38 mpg, the Squariel is economical for both city commuting and longer rides.
- Comfortable Ride: The combination of a well-designed suspension and a full cradle frame ensures a smooth and comfortable riding experience.
Cons:
- Weight: At 197.3 kg (435.0 pounds), the motorcycle may feel heavy for some riders, especially in tight maneuvers.
- Kick Start Only: The lack of an electric starter might deter some modern riders accustomed to convenience.
- Limited Availability of Parts: As a vintage model, sourcing replacement parts can be a challenge, potentially affecting maintenance and restoration efforts.
In summary, the 1957 Ariel 4G Square Four Mark II is a remarkable blend of style, performance, and historical significance, making it a coveted piece for motorcycle enthusiasts and collectors alike. Its unique features and innovative engineering make it not just a means of transportation, but a cherished link to the rich legacy of British motorcycling.