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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 booming and induction roar in car 27-EX, comparing its performance to car 26-EX.

Identifier  ExFiles\Box 14\8\  Scan299
Date  21th April 1931 guessed
  
-2-

The booming of 27-EX. with all the four engine feet fitted was not excessive up to 65 m.p.h. At 70 m.p.h. there was a considerable roar from the induction system presumably due to the carburetter. We consider that this car is far better than 26-EX. for roughness and booms in its present condition.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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