Horizontally Opposed Engines. Two or Three-speed Gear.
MESSRS. W. E. Brough and Co., of Basford, Nottingham, are for next year confining their attention to the horizontally-opposed twin engine of moderate power. Three models are made, which differ only in detail, each having the same power unit. The bore and stroke of the engine are 70 X 64.5 mm., 497 c.c. The valves have detachable ports, the exhaust ports being made with flanges for cooling the exhaust gases. The pistons are light and unbreakable, and fitted with three rings. The valves are placed overhead, provision being made to prevent them from falling into the cylinder in the case of breakage. The crankshaft is of high tensile steel, running on roller bearings, having balanced webs, and carrying an outside steel flywheel. The lubrication is by Best and Lloyd drip feed to the crank case, and a simple method of forcing oil at high pressure to the adjustable big end bearings is used. The engine is firmly fixed to the frame by three bolts.
It is readily removable, but the cylinders can be detached for cleaning purposes without removing the engine.
Model H S is fitted with a Brough two-speed counter-shaft gear operated by dog clutches fixed under the engine crank case, forming one unit with the engine, and giving ratios in the proportion of 3 to 2. The transmission is by chain from the engine to the counter-shaft, thence by John Bull rubber belt to the rear wheel over an adjustable pulley, which gives a top gear range of 4 to 6½ to 1. A large and efficient silencer is supplied, but no clutch or kick starter is fitted.
Model H B is for the most part similar to that just described, but is fitted with a Sturmey- Archer three-speed hub, ratios 4, 6½, and 9¾ to 1, and handle starter. The tank capacity of both models is 1¾ gallons petrol and three pints of oil. This machine having a ground clearance of six inches is suitable for use Overseas.
Model HTT is practically identical with H S, but is fitted with a specially selected engine, having light steel pistons, high compression, and extra lubrication to the front cylinder. A speed of sixty five miles per hour is guaranteed.
The Motor Cycle, December 3rd, 1914. p619
I have read the article dealing with ladies and lightweights in a recent issue of The Motor Cycle. While some prefer a lightweight, I prefer a machine of medium weight and plenty of power. This year my choice fell on a 3½ h.p. horizontally opposed twin Brough, with two-speed engine box.
From the enclosed photographs you will see that it is a perfect lady's model. It is a beautiful machine, and runs very sweetly. The engine is capable of 50 m.p.h., and hills never trouble it.
The smooth drive of this twin is far ahead of any machine I have ever ridden. I advocate a horizontal twin in preference to any engine made, and those who have had experience of this machine will endorse my remarks.
(Miss) M. Reid.
The Motor Cycle, August 6th, 1914. P190
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