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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).
Complaints of vibrations on the 40/50 chassis, focusing on compression levels and belts as potential causes.

Identifier  ExFiles\Box 25\3\  Scan082
Date  20th July 1922
  
To Hs{Lord Ernest Hives - Chair}, from BJ.

Copies to
CJ.
Wor.{Arthur Wormald - General Works Manager}
BY.{R.W. Bailey - Chief Engineer}
EP.{G. Eric Platford - Chief Quality Engineer}
BN.{W.O. Bentley / Mr Barrington}

Re Hs{Lord Ernest Hives - Chair}1/LG19.7.22.

RECEIVED F C 21 JUL 1922

BJ13/H20.7.22.

X634
X790
X4299

COMPLAINTS OF VIBRATIONS ON 40/50 CHASSIS.

I was interested to read your report to R.{Sir Henry Royce}

107-MG. PN.{Mr Northey} had the carburetter adjusted. I am not sure where this was done, as PN.{Mr Northey} is on his holidays. After this adjustment and the decarbonising, etc. PN.{Mr Northey} and I agreed that the car was running sufficiently smoothly to be a reasonably good example of a high compression car, and could be used for demonstrating provided the hum in the engine could be overcome. I am sorry if Cx.{Major Len W. Cox - Advertising Manager} still considers the vibration unsatisfactory. I will ask PN.{Mr Northey} to explain what adjustment was made to the carburetter.

I am interested to see that you do not consider either 107-MG or 20-UG can be described as silky running cars. This is also our feeling. And we had formed the opinion that unless some other definite cause could be found, this might be improved by lowering the compression. H.{Arthur M. Hanbury - Head Complaints},Br.{T. E. Bellringer - Repair Manager} and I are trying 107-MG with medium compression tonight.

I am glad to see that you agree that the cars will be better on the average with the lower compression.

Closed Cars. I am not quite clear why you suggest that "We shall have complaints with the closed cars" as I understand the latest arrangement is that closed cars-will continue to have medium compression, which is the compression you have been giving them previously, and therefore there should be no alteration as regards closed cars.

Belts. As belts are one of the causes of vibration, what course do you consider we should pursue to overcome this.

(a) Should we now supply belts which will not cause vibration?
(b) Is it desirable to remove belts which have been supplied and which are likely to cause vibration,
  
  


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