Old Bike Australasia: Ariel Square Four — The Squariel — Shannons Club

9 Май 2015 | Author: | Комментарии к записи Old Bike Australasia: Ariel Square Four — The Squariel — Shannons Club отключены
Kawasaki Square Four 2 Stroke Prototype

Old Bike Australasia: Ariel Four — The Squariel

and photos . Jim Scaysbrook

The story of the Square Four must with the young Edward who in time, would rise to the most powerful figure in the motorcycle industry. But it was a different in the mid 1920s, when young was a struggling engineer in London, together a 350 cc overhead camshaft-engined of his own design in a tiny workshop.

He had (and designs) of producing a machine, but this was way beyond his means, and although he had hawked the around the trade, there no takers. Then, during a to Birmingham with his blueprints his arm, Turner met Jack the owner of the Ariel company at Oak, and Sangster agreed to the youngster a drawing office, as as an assistant Bert Hopwood. reasoned that his square-four overcame the bugbears of the normal four which, when transversely in the frame was too wide, and mounted fore-and-aft, resulted in an long wheelbase.

What was a 500 cc design with a chain-driven camshaft, with the drive to the taken from the left-hand end of the crankshaft. It was in effect a doubled-up twin, with the two cranks by gears.

The prototype engine was mounted in the frame used for the company’s 250 cc but by the time the new model was ready to be at the 1930 Earls Court the engine had been transferred to the robust chassis used for the 500 cc single. A hand-change four-speed gearbox was used initially. The Four (catalogued as the model 4F) a sensation at the show, sharing the with another new ‘four’, the V4 Silver Hawk.

The economy, on the hand, was on a rapid downward following the Wall Street and even though Ariel was up to produce the new model for 1931, the was already in serious strife. So in fact, that by 1932 was bankrupt, and was only saved by the of private capital from Sangster, who reformed the company Ariel Motors (JS) Staff numbers were and the majority of the factory leased

Motorcycle production shrank one small section of the premises, and the of models trimmed.

Surprisingly, the austerity of the times, the big-ticket Four remained in production, but the was scheduled for a major redesign in the years. Early examples from insufficient cooling of the head and rocker box, in frequent blown head To encourage sidecar use, the was quickly upped for the second of production to 587 cc, by the simple expedient of each cylinder by 5 mm.

For 1933, a four-speed, positive foot change gearbox was

In the next major redesign, the end of 1935, the costly overhead operation gave way to pushrod valves. Down below, the design which had overhung (with the exception of the driving on the left rear) was completely to feature full crankshafts, by gears on the left hand rather than in the centre. As as the 600 cc version, a full 1000 cc job was on offer when the new model as the 4G) went on sale in 1937.

The model put out 38 bhp at 5,500 rpm and Ariel it would pull from ten to one miles per hour in top gear.

In a unique form of rear was added (as an option) to the Square and also to the single cylinder Red This was a form of plunger but with pivoted links allowed the rear wheel to through an arc, giving chain tension. Both the 600 and versions dispensed with carburettors in favour of the Solex carburettor and from 1938, the 26AH.

Ariel Square Four

when things were rosy, along came the and much of Ariel’s production was to armaments and other engineering, a 350 cc military model based on the Red Hunter was produced. When returned, motorcycle production at Oak at first concentrated on the 350 single, but the Square Four went into production, but in 1000 cc only.

By this stage, had new owners the BSA Group but the company, at publicly, remained in charge of its own with former racer Ken at the helm. The Square Four was the subject of a major redesign Mark I), with telescopic forks and the substitution of aluminium for major engine components, the cylinder block and the head. chopped a whopping 33 pounds (15 kg) the considerable all-up weight.

The was still in its pre-war ‘two form, with the exhaust exiting from manifolds to the cylinder head, but it 1954 major redesign took to produce the Mark II version the incarnation of the design.

When the British magazine Cycle tested a Mark II in the report said “few, if other types of machine the same feeling of exhilaration. The of a ‘Squariel’ has four cylinders and cc at his fingertips, waiting to respond to his whim.” The tester confirmed the flexibility of the engine, which ‘snatch-free’ from 10 mph to the top speed of 102

It also praised the braking saying. “with such an of power and speed at one’s the subject of stopping quickly and becomes one of prime importance. The of both the Ariel’s brakes be exaggerated. The functionallooking full-width front brake was fade-free, in operation and completely trustworthy hard application and in all circumstances.” The fuel tank allowed 300 miles (480 km) to be covered fuel stops.

The Mark II four separate exhaust two on each side, which from handsome polished manifolds and curved downwards to a single muffler on each With high quality becoming available, compression was raised to 7.2:1, with subsequently up to 42 bhp at 5,800 rpm. was now by a variable choke MC2 SU carburettor, with an air cleaner.

However while the sporting singles gained a very new frame with swinging arm suspension, the Square Four on with the plunger/link design, and do so until it reached the end of its production in by which time the UK price was including the dreaded UK Purchase Indeed, this was the end of the line for all Ariels, replaced by a new wave of two headed by the Val Page-designed twin Leader.

The Square Four had a of sorts in the late 1960s, the Healey brothers, George and produced the Healy 1000/4.

Tim had drag racing a machine a highly modified Square engine, and with what he and had learned about making the work more efficiently stay together longer), came up with the idea of own complete machine. This the MkII engine which had thought out modifications to the lubrication including a separate oil filter in an spine frame (made by Bros in England) with the hung underneath.

Metal front forks and Girling units were used, a huge Grimeca double front brake. The massive top of the frame carried the oil, and the lubrication and subsequent cooling the compression ratio to be raised to giving a 10% increase in power. The brothers managed to carve 60 pounds in weight from the model, which further performance.

Inspired by their creation and by the interest it created from buyers after its release at the Earls Court Show, the abandoned their trucking in the Midlands and moved to Reddich, the old Royal Enfield factory, to on producing the 1000/4 as well as for other Squariels, but from to the end of the show in 1977, only 28 machines were built. Healey 1000/4s bring big on the rare occasion one comes up for

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