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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).
Instructions for modifications to a Phantom head to create a high compression, large valve version.

Identifier  ExFiles\Box 14\3\  Scan089
Date  29th August 1933
  
To RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell} Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}2/KT.29.8.33.

HIGH COMPRESSION LARGE VALVE HEAD.

Please have a Phantom head made with modifications shown on attached drawing Hs.{Lord Ernest Hives - Chair}1012.

(1) Ceiling of combustion chamber lowered .164", and valve guide sockets lengthened by .164".

(2) Valves .164" longer in stem fitted. Hs.{Lord Ernest Hives - Chair}1013 & Hs.{Lord Ernest Hives - Chair}1014.

(3) Valve guides to Hs.{Lord Ernest Hives - Chair}1117 and Hs.{Lord Ernest Hives - Chair}1118 lengthened by .164".

(4) Provision for 14 mm. plugs instead of 18 mm. with centre line of plug lowered as shewn on drawing.

(5) Double taper valve springs.
Hs.{Lord Ernest Hives - Chair}664 Outer spring.
Hs.{Lord Ernest Hives - Chair}665 Inner spring.
EX.8895 Crumpet retainer.
EX.8896 Top spring cap.
EX.8897 Bottom spring washer.

Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}
  
  


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