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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).
Engine vibrations and improvements using diamond mountings and torque reaction dampers on a 6-cylinder engine.

Identifier  ExFiles\Box 137\4\  scan0396
Date  20th October 1931
  
COPY.
SG.{Arthur F. Sidgreaves - MD} FROM R.{Sir Henry Royce}

C. to WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} HS.{Lord Ernest Hives - Chair}
C. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design}

γ634 R3/M20.10.31. X634.

ENGINE VIBRATIONS.

It seems pretty universally agreed that with the diamond mounting fitted with torque reaction dampers and soft rubber, and the crankshaft fitted with semi balance weights, and the thin disc of the flywheel, we can use the 6 cyl. engine of high speed and good output without incomfortable vibrations being communicated to the bodywork, and this permits us to obtain a considerable step forward in BHP. which will allow the big car in the continental tourer form being a 90 MPH. car, and the 25HP. capable of going well over 70 MPH. with full equipment of splashers etc, and a comfortable body.

R.{Sir Henry Royce}
  
  


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