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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).
Ignition timing setting for the turbulent head.

Identifier  ExFiles\Box 17\6\  Scan044
Date  31th May 1928
  
To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/LG31.5.28.

[Handwritten, crossed out: X7060]

TURBULENT HEAD. [Handwritten: X7050 / X7060 (crossed out)]

The ignition setting on the turbulent head is 10° later than on the cast iron head. The flywheel marking for the timing with the hand control in the fully advanced position is therefore 10° B.T.D.C.

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


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