Ariel 4G Square Four Mark II 1958 - Specifications & Review
Article Complete Info
| Articleid | 604210 |
|---|---|
| Category | Allround |
| Make | Ariel |
| Model | 4G Square Four Mark II |
| Year | 1958 |
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) |
|---|---|
| Clutch | Dry, 3-plate |
| 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 | Deep red |
|---|---|
| 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. Sidecar option. |
| 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 1958
Introducing the 1958 Ariel 4G Square Four Mark II
The 1958 Ariel 4G Square Four Mark II, affectionately known as the "Squariel," stands as a testament to the innovative engineering and stylish design of mid-20th century motorcycles. Positioned in the all-rounder category, this motorcycle seamlessly blends performance with practicality, appealing to riders who appreciate both spirited performance and everyday usability. Designed by the illustrious Edward Turner, the Mark II model introduced enhancements over its predecessor, making it a coveted classic among enthusiasts and collectors alike. With its deep red finish and distinctive square four-cylinder configuration, the Ariel 4G is not just a motorcycle; it's a piece of history that commands attention on and off the road.
Engine Performance and Riding Characteristics
At the heart of the Ariel 4G Square Four is a robust 995 cc square four-cylinder engine, delivering a commendable 45 horsepower at 5,500 RPM. This powertrain, coupled with a 4-speed gearbox and a chain final drive, propels the motorcycle to a top speed of 160 km/h (99.4 mph), making it a formidable performer on the open road. The air-cooled engine features a compression ratio of 6.0:1, ensuring a balanced mix of power and efficiency while consuming a frugal 3.04 liters per 100 km (77.38 mpg). Riders will appreciate the smooth, refined delivery of power paired with a comfortable riding posture, making long-distance journeys a pleasurable experience. The bike's weight, at 197.3 kg (435 pounds), strikes a fine balance, providing stability without compromising agility.
Key Features and Technology
The engineering prowess of the 1958 Ariel 4G is highlighted by its unique design elements and advanced technology for its time. The Mark II features a full cradle frame that enhances rigidity and stability, crucial for confident handling in various riding conditions. Its suspension system combines an oil-damped telescopic fork at the front with a plunger-link spring at the rear, ensuring a smooth ride over uneven terrain. The braking system, featuring drum brakes with a sizable 203 mm rear diameter, offers reliable stopping power. Additionally, the separate barrels and redesigned cylinder head with four exhaust pipes exemplify the cutting-edge design that set the Squariel apart from its contemporaries. For those looking to expand their riding experience, a sidecar option was also available, making the 4G an ideal choice for leisurely rides with a companion.
Pros and Cons
Pros:
- Unique Engine Design: The square four-cylinder engine not only delivers impressive performance but also offers a distinctive aesthetic that stands out.
- Fuel Efficiency: With an impressive fuel consumption rate, the 4G Square Four allows for longer rides without frequent stops at the pump.
- Comfortable Riding Position: The ergonomics of the bike make it suitable for both short trips and long-distance rides, catering to a wide range of riding preferences.
Cons:
- Weight: At 197.3 kg, some riders may find the Squariel slightly heavier than modern alternatives, which could impact maneuverability.
- Drum Brakes: While reliable, the drum brake system may not provide the same level of stopping power as contemporary disc brakes, particularly in emergency situations.
- Limited Performance Upgrades: As a classic motorcycle, modifying the 4G for enhanced performance can be challenging due to limited aftermarket support and parts availability.
In conclusion, the 1958 Ariel 4G Square Four Mark II encapsulates the charm of vintage motorcycling while delivering commendable performance and comfort. For enthusiasts seeking a blend of history, style, and a unique riding experience, the Squariel remains an iconic choice.