Ariel 4G Square Four Mark II 1955 - Specifications & Review
Article Complete Info
| Articleid | 133114 |
|---|---|
| Category | Allround |
| Make | Ariel |
| Model | 4G Square Four Mark II |
| Year | 1955 |
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. |
| Fuelsystem | Carburettor. SU MC2 carburettor with air cleaner |
| Gearbox | 4-speed |
| 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
| Dryweight | 193.0 kg (425.5 pounds) |
|---|---|
| Fuelcapacity | 16.00 litres (4.23 gallons) |
| Oilcapacity | 3.40 litres (0.22 quarts) |
| Overalllength | 2,083 mm (82.0 inches) |
| Powerweightratio | 0.2332 HP/kg |
About Ariel 4G Square Four Mark II 1955
Introducing the 1955 Ariel 4G Square Four Mark II
The 1955 Ariel 4G Square Four Mark II stands as a distinguished member of the mid-20th century motorcycle renaissance, capturing the essence of British engineering and style. Revered for its innovative design and powerful performance, the "Squariel," as it affectionately became known, was engineered for enthusiasts seeking an all-rounder that could grace both the open road and city streets. With a legacy rooted in the craftsmanship of Edward Turner, this motorcycle is not only a machine but a piece of history, embodying the spirit of an era when motorcycles were more than just a mode of transportation—they were a lifestyle.
Engine Performance and Riding Characteristics
At the heart of the 4G Square Four Mark II lies a robust 995cc square four-cylinder engine, delivering a commendable 45 horsepower at 5,500 RPM. This unique engine configuration results in a smooth, refined power delivery that is not only exhilarating but also remarkably manageable, offering a top speed of 160 km/h (99.4 mph). The 6.0:1 compression ratio and air-cooled design enhance the engine's performance while keeping maintenance straightforward. Riders will appreciate the seamless shifts offered by the four-speed gearbox, coupled with the responsive chain final drive that provides a direct connection to the road. This motorcycle is a delight for those who crave a spirited ride without sacrificing comfort and control.
Key Features and Technology
What sets the 1955 Ariel 4G Square Four Mark II apart is its distinctive engineering and attention to detail. The redesigned cylinder head features four separate exhaust pipes that not only enhance aesthetics but also improve exhaust flow, resulting in a more efficient engine. The full cradle frame offers excellent rigidity, further complemented by the oil-damped telescopic front forks and plunger-link rear suspension, ensuring a plush ride over various terrains. With a generous fuel capacity of 16 liters, this motorcycle is ready for long rides, while its classic red and chrome color scheme adds a touch of elegance. The kick starter mechanism is a nod to the traditionalist, connecting riders with a nostalgic start-up experience.
Pros and Cons
Pros:
- Innovative Engine Design: The square four-cylinder configuration provides a unique blend of smooth power delivery and distinctive sound.
- Comfortable Ride: The advanced suspension system ensures a comfortable experience, even on longer journeys.
- Classic Aesthetic: The stunning red and chrome finish captures the timeless appeal of mid-century motorcycles, making it a beautiful collector's item.
Cons:
- Weight: At 193 kg (425.5 pounds), the bike may feel heavier compared to modern motorcycles, which could affect handling for some riders.
- Kick Start Only: The absence of an electric starter may be a drawback for those accustomed to modern conveniences, especially in challenging conditions.
- Limited Parts Availability: As a classic model, sourcing replacement parts may be more challenging compared to contemporary bikes, requiring dedicated enthusiasts to keep it running smoothly.
In conclusion, the 1955 Ariel 4G Square Four Mark II is a captivating blend of performance, design, and heritage, making it an essential for any motorcycle enthusiast's collection. Whether you're tearing down country roads or showcasing it at vintage bike shows, this motorcycle promises a ride filled with character and charm.