British Motorcycles

Omega Motorcycles 1922

Omega 1922 348cc Duplex Frame

Many excellent features are incorporated in the 1922 duplex-frame Omega.

Omega 1922 348cc

Duplex frame construction of the Omega, showing how the engine-gear assembly and footboards are carried.

OMEGA. (54.)

3 h.p. Model- 71x88 mm. (348 c.c.); single-cyl. two-stroke : drip feel lubricatiou; Amac carb.; cliain-driven mag.; 3-sp. Burman gear; clutch and kick-starter; chain drive; 26x2¼ in. tyres. Price £73 10s.

W. J. Green, Ltd., Omega Works, Coventry. - Undoubtedly the centre of interest on the Omega stand is the new 3 h.p. two-stroke with its wide duplex frame and ample protection for the rider. New forks in which the unsprung weight is reduced to a minimum, a novel system of tank attachment whereby "drumming" is largely eliminated, and a quickly detachable engine and gear unit are outstanding features, though there are many details which well repay a careful study. Both brakes are of the wedge type acting in dummy belt rims. A two- stroke engine of 348 c.c. is manufactured by the firm, and is a fine piece of work with excellent cooling arrangements.

This machine may be fitted with a light sidecar, or for solo purposes may be obtained with two-speed gear.

5-6 h.p. Model. - 70x88 mm. 680 c.c; twin-cyl four-stroke; side-by-side valves; drip feed lubrication; Amac carb.; chain-driven mag,; 3- sp. Burman gear; clutch and kick-starter; chain drive; 700x80 tyres. Price £120 15s. solo.

A purely sporting machine, the 5-6 h.p. Omega has a J.A.P. engine installed in a more or less conventional frame. The fittings and finish are excellent, and the specification is admirably suited to the requirements of the fast solo rider. Saddle, tank, large tyres, and ail-chain drive are attractive features.

The two-stroke engine before-mentioned is also sold in a conventional frame with two-speed gear and chain and belt drive, the price being £55 13s.; while two J.A.P.- engined lightweights are obtainable, viz., a 250 c.c. engine with three-speed Sturmey-Archer gear, clutch, and kick-starter, at £78 15s., and a 293 c.c. engine with two- speed gear, clutch, and kick-starter, at £65 3s. These models are both fitted with chain and belt drive.

The Motor Cycle

Omega 1922 348cc Two-stroke

An Omega model of original frame design. The whole of the power unit, and also the footboards, are inside the duplex frame.

More on the Omega Twostroke

An Omega Novelty.

Original Ideas Embodied in the Frame Layout of the New Two-stroke Model.

QUITE one of the most interesting developments in the two-stroke world is the latest Omega model. The whole machine bristles with interest and should attract a considerable amount of attention at Olympia. The engine, which is built by the firm concerned, is of the four-port type, and has a bore and stroke of 71x88 mm. (348 c.c.). A hemispherical combustion chamber surmounts a well-ribbed cylinder casting, the ports being of large area. The gudgeon pin floats in the small end bush, and also in the cast iron piston bosses, endwise location being effected bv spring rings. All the bearings of the built-up crankshaft are of phosphor-bronze and of particularly large proportions. Carried on the rear engine plates are the magneto and a two or three-speed gear box with clutch and kickstarter, the whole with the aluminium foot-plates forming a compact unit, which may be removed from the frame by uncoupling the petrol and oil pipes and final drive and slacking off three nuts.

A very wide duplex loop frame, somewhat reminiscent of that employed by the A.B.C., contains the whole of this unit within its width, so that, in case of a fall, the frame will protect the working parts. Final drive is by belt.

Another novelty lies in the method of carrying the fuel tank, for no screwed lugs are carried by this delicate portion of the machine. Instead, the tank is recessed along its top centre so as to fit round the top rail, the whole being pressed upwards by plates through jack screws carried in special frame lugs.

Detail work includes an exhaust release leading into the exhaust port, the latter part being well ribbed. Internal type brakes are fitted. The finish is in black with a red tank panel. Three variations are obtainable : with plain two-speed gear, chain and belt drive, and either two or three-speed gear with clutch and kick-starter, in which case final transmission is by chain. The forks are of a somewhat novel type, the wheels being carried by rods acting in long guides, while the girder portion of the forks is stationary and clipped to the handle-bar on either side of the head. This construction enables a simple type of adjustable handle-bar to be used.

Both compression and recoil springs are mounted high up and well out of the way of mud. Pivoted at the peak to a lug on the top tube, the saddle is fixed at the rear in such a manner that it may be reversed in case of leaving the machine in rain so that the seat does not get wet; -and another important provision for the rider's comfort lies in the fact that ample legshields are -fitted, which serve also to protect much of the machine from mud splashes without interfering with the cooling draught. The saddle position is particularly low, and yet there is comfortable leg room for a tail rider. In the illustration the leg shields are not shown.

The Motor Cycle

1921 24th November, Olympia Show


Apart from their standard models, the makers of the Omega are introducing one of the few novelties of the Show, and undoubtedly the centre of attraction on their stand will be the new duplex frame two-stroke. A 350 c.c. two-stroke engine, with a well-finned cylinder, is built up as a unit with a three-speed gear box, clutch, and kick-starter, and aluminium footplates. This unit is carried in a very wide duplex frame, and IS quickly detachable therefrom. The saddle position is very low, and the mudguarding and leg screens are excellent. Alternative final drive and two or three-speed gear boxes are offered, and the method of holding the tank against the top tube by plates and jack screws should be studied, as it offers a fresh solution to the question of tank fixings without rattle. Examples of one or two of the other Omega models will also be shown.

The Motor Cycle

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