Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Notes on La Salle engine performance and an analysis of torsional vibrations in Vee 8 and Line 8 crankshafts, noting fractures at high RPM.

Identifier  ExFiles\Box 173\1\  img421
Date  19th February 1934 guessed
  
9

partly because it is a side valve engine and again partly because it is using a fixed choke carburetter.
La{L. A. Archer} Salle 240 Cu Inch. 6.5-1 C/R.{Sir Henry Royce}
R.P.M. 500 1000 1500 2000 2500 3000 3600
B.M.E.P. 97 102 106 109 105 97 84

- TORSIONAL VIBRATIONS Vee 8 & Line 8.

- I saw the torsional vibration diagrams of the 8 shaft particulars of which I have given. The 4 per rev was at 3,200 the 8/rev at 1600. I also saw the diagrams of the Vee 8. Curiously enough the 4/rev period on this shaft was little higher than on the line 8 being about 3,300. There was a 3 per rev period, presumably caused by inertia & not explosion, at about 4300 and at this speed they fractured several crank shafts.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙