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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).
Test results for the 20-EX model, detailing Torsional Period, RPM, MPH, and speedometer checks.

Identifier  ExFiles\Box 14\2\  Scan094
Date  9th January 1931
  
FOR FILES.
X/7010
20-EX.
9.1.31.
2.125 Crank Pins.
Journals 2.625
X.7010.
82.M.P.H.
X.634.

The master Torsional Period on 20-EX begins at 3760 R.P.M. that is 100.M.P.H. on Top gear.

The speedometer has been checked in 3 different methods all of which correspond.

The top R.P.M. reached with the engine is 4075, which equals 107.5 M.P.H. on Top gear. Although there was only a difference of 1.M.P.H. between the two results on the first gear according to the speedometer, as tested.

I.A.Leslie.
  
  


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