1939 Velocette Roarer Replica

The Birmingham Blower

By Robert Smith
Published on February 13, 2018
article image
by Robert Smith
Dan Smith's 1939 Velocette Roarer replica.

1939 Velocette Roarer Replica

  • Engine: 498cc air-cooled supercharged SOHC parallel twin w/two counter-rotating crankshafts, 68mm x 68.25mm bore and stroke, 7.5:1 compression ratio, 54hp @ 4psi boost (est.)
  • Top speed: 140mph (est.)
  • Carburetion: Single Amal 10TT9 w/Shorrock-type supercharger
  • Transmission: 4-speed, shaft final drive
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