Development
Designed as a team effort by Brough, 'Ike' Hatch, and Freddie Dixon, the engine has two horizontally opposed flat twins one above the other and geared together, thus rotating counter to each other forming an H engine. Connecting rods from opposed cylinders were of the fork and blade type and thus shared a common crank pin. All pistons moved in unison, that is to the left or to the right at the same time. The pistons could thus be counterweighted 100% yielding a perfect balance. Primary, secondary and higher-order sources of vibration canceled each other, as did the gyroscopic effects from each crankshaft.
George Brough described it a "flat vertical" engine. The four cylinders were 68 mm × 68 mm (2.7 in × 2.7 in) equating to 988 cc, with the camshafts gear-driven. Further development work was done on the engine, reconfiguring it as 71 mm × 63 mm (2.8 in × 2.5 in) (998cc), with chain-driven camshafts.
The frame was designed to accommodate the unusual engine and was welded together with a fully sprung plunger type springing for the rear wheel, unlike the cantilever swingarm suspension on the Brough Superior SS100. The forks were Brough Superior's "Castle" forks derived from a Harley-Davidson design, and many components such as the petrol tank, saddle and wheels were the same as standard Brough Superior machines.
The Dream had optional three or four speed transmission, manufactured to Brough's own design by David Brown Ltd. of Huddersfield. The final shaft drive had an underslung worm and pinion gear on the rear axle and the propeller shaft was enclosed in a tube.
Read more about this topic: Brough Superior Golden Dream
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