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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).
Request to produce a modified Wraith III cylinder head with different inlet and exhaust valve specifications.

Identifier  ExFiles\Box 8\6\  06-page16
Date  18th November 1937
  
To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}

619

Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/AP.18.11.37.

WRAITH III.

Will you please produce a Wraith cylinder head EW.1296 but with 1.5 dia. inlet valves and 1.3 dia. exhaust valves as against the present 1.6 dia. inlet and 1.4 dia. exhaust.

Valves required for the job will be as follows:-

Exhaust. Valve head dimensions as E.88447 with stem and overall length as E.61299 (These valves in std. KE.965) stellited).

Inlet. Valve head dimensions as E.88782 with stem and overall length as EW.1429. These valves in standard Wraith S.62 material.

This head and valves are required as soon as possible to produce.

Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}
  
  


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