Ariel 4G Square Four Mark II 1959 - Specifications & Review
Article Complete Info
| Articleid | 821123 |
|---|---|
| Category | Allround |
| Make | Ariel |
| Model | 4G Square Four Mark II |
| Year | 1959 |
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 | Claret, Red/black, Black |
|---|---|
| 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. |
| Electrical | 6 Volt |
| 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 1959
Introducing the 1959 Ariel 4G Square Four Mark II, a remarkable fusion of engineering and artistry that stands as a testament to the golden age of British motorcycling. Often affectionately dubbed the "Squariel," this motorcycle captures the imagination of enthusiasts with its unique square four-cylinder engine layout and classic aesthetics. Positioned as an allrounder, the 4G Square Four was designed for riders seeking versatility, whether cruising the open roads or tackling the rigors of daily commutes. With its robust build and timeless design, this model remains a cherished piece of motorcycling history, appealing to collectors and vintage aficionados alike.
At the heart of the 1959 Ariel 4G Square Four Mark II lies a 995cc square four-cylinder engine that produces a respectable 45 horsepower at 5500 RPM, propelling the bike to a top speed of 160 km/h (99.4 mph). The engine’s unique configuration not only contributes to a smooth and balanced ride but also delivers impressive torque, making it an exhilarating choice for both novice and experienced riders. With a compression ratio of 6.0:1, the engine operates efficiently, achieving a commendable fuel consumption rate of 3.04 litres per 100 km, or an impressive 77.38 miles per gallon. Riders will appreciate how the 4-speed gearbox and dry 3-plate clutch work in harmony, providing a seamless transition through gears for a dynamic riding experience.
The Ariel 4G Square Four Mark II is packed with innovative features that enhance its performance and comfort. A full cradle frame offers superior stability, while the oil-damped telescopic fork in the front and plunger-link spring suspension at the rear ensure a smooth, controlled ride over varying terrains. Stopping power is provided by reliable expanding drum brakes, with a 178 mm front and a more robust 203 mm rear brake diameter. The model boasts a stylish design, available in striking color options like Claret, Red/Black, and Black, making it as much a visual delight as a mechanical marvel. Designed by the legendary Edward Turner, the Mark II also features separate barrels and a redesigned cylinder head with four distinct exhaust pipes, showcasing a meticulous attention to detail that enthusiasts will admire. For those seeking the extra thrill of sidecar riding, this model offers that option as well.
PROs:
- Unique Engine Configuration: The square four-cylinder design provides smooth power delivery and unique aesthetics.
- Fuel Efficiency: With an impressive fuel consumption of 3.04 litres/100 km, it offers great mileage for an older motorcycle.
- Stylish Design: Classic looks combined with multiple color options make it a standout choice for vintage motorcycle lovers.
CONs:
- Weight: At 197.3 kg (435.0 pounds), it may feel heavy for some riders, especially during low-speed maneuvers.
- Drum Brakes: While adequate for their time, the drum brakes may not offer the stopping power expected by modern riders.
- Kick Start Only: The absence of an electric starter can be inconvenient for some, particularly in urban settings or during chilly mornings.
In summary, the 1959 Ariel 4G Square Four Mark II is a captivating motorcycle that beautifully combines charm, performance, and innovative technology, making it a must-have for any serious motorcycle enthusiast.