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).
Memo discussing exhaust system designs, comparing with Cadillac and proposing new tests.

Identifier  ExFiles\Box 173\1\  img287
Date  12th February 1934 guessed
  
III
Exhaust Systems

You will have received the paper on exhaust systems that I sent you. It contains a number of novel suggestions, but I have met no one yet who is trying anything very different from what we are doing ourselves. Nevertheless I feel that we should continue working on Silencers as Cadillacs are doing better than we are with regard to weight & cost.
One thing I think we should definitely try is a comparison of the 20/25 & Bentley heads on a 25 H.P. car, also composite camshafts & compression ratio to get some idea as to how raising the efficiency of an engine affects silencing difficulties.
Information obtained from Cadillacs is briefly.
1) They find the two 6 cyl banks of the twelve far more difficult to silence than the two 8 cyl banks of the sixteen.
2) They find the lowest silencer volume with which they can get satisfactory
  
  


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