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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 for two sets of modified valve springs for the Phantom III to address a valve bounce issue.

Identifier  ExFiles\Box 96\2\  scan0085
Date  29th November 1935
  
+374

To RHC.{R. H. Coverley - Production Engineer}

Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}29/KW.29.11.35.

Phantom III.

Will you please make 2 sets, that is, 48 Valve Springs to Rm.{William Robotham - Chief Engineer}24, this being a modification of E.86365 outer spring. The inner springs to be fitted in conjunction with Rm.{William Robotham - Chief Engineer}24 are to Hs.{Lord Ernest Hives - Chair}1828.

We are having trouble with valve bounce at 4250 to 4500 r.p.m. on No.9 unit, which has the increased stem dia. exhaust valve and no lightening holes.

We should like to get these springs as soon as possible, to try out on No.9 unit.

Hs{Lord Ernest Hives - Chair}/L.H. Swindall.
  
  


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