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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).
Letter discussing the feasibility of fitting a high compression cylinder head to a 20/25 demonstration car.

Identifier  ExFiles\Box 27a\1\  Scan198
Date  31th December 1934
  
G.W. Hancock, Esq.,
Hotel de France,
Chateauroux,
Indre, France.

x4013

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}15/KW.31.12.34.

High Compression Cylinder Head.

Your report was somewhat inconclusive.
Sr. however has written to say that he wants this head on his new 20/25 demonstration car. I think before we accede to his request we should have a little more information on this cylinder head, because it does not seem worth while to introduce the complication of non-standard parts when so little benefit is gained.

I have asked Sr. to let you have the head and governor off Poberejsky's car if this can be done. If this cannot be managed, cable me and I will prepare another head, but I do not want to do this unless it is essential.

We attach curves showing that there should be some gain from this head.

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


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