Rolls-Royce Archives
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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Calculations for engine volume displacement and gas velocities for different carburetor pipes.

Identifier  ExFiles\Box 127\2\  scan0157
Date  16th December 1940 guessed
  
3½ x 4½ Engine (260 cu.in)
Volume displaced at 1000 R.P.M. = (260 x 1000) / (12³ x 2 x 60)
= 1.25 cft/sec.

Smallest Stromberg pipe used = 1.4" dia - Gas vel = 117 ft/sec.
(with single carb.)
Standard Wraith pipe 1.6" dia - Gas vel = 89.4 ft/sec.
Centre 4 cyls. of 3 S.U. B.80 1.6" dia - Gas vel = 59.7 ft/sec.

Rovers.
1091.
  
  


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