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).
Recommending an increased compression ratio for general purpose cars using an aluminium engine.

Identifier  ExFiles\Box 19\7\  Scan116
Date  27th May 1927
  
To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair}

X790

Hs{Lord Ernest Hives - Chair}2/LG27.5.27.

EAC-7 - COMPRESSION RATIO. X770

On the aluminium engine with the anti detonating head, we are running with a compression ratio of 4.6 to 1.

We recommend for general purpose cars we should use 4.5 to 1 compared with 4 to 1 on present engine.

Hs.{Lord Ernest Hives - Chair}
  
  


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