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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).
Alteration to engine timing, proposing two new camshaft designs with diagrams.

Identifier  ExFiles\Box 13\2\  02-page010
Date  30th August 1928
  
Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer}
c. to BJ. BY.{R.W. Bailey - Chief Engineer}

Y7096

E2/1430.8.28.

EAC.10 ENGINE. K.7090 K.411 X.1770

Referring to your report Hs{Lord Ernest Hives - Chair}/ACL1/LG28.8.28.,
it is concluded that an alteration to the timing would be beneficial, and R.{Sir Henry Royce} would like you to get out at Derby a new exhaust cam utilising the present exhaust for the new inlet.
Two new camshafts should be prepared with different angles between the cams giving timing diagrams as follows :-

No.1.
Diagram details: IN 4, 12 EX., 61 DIV, 57 DIV, IN 52, 52 EX.
Angle between cams = 114°

No.2.
Diagram details: IN 6, 10 EX., 61 DIV., 57 DIV, IN 54, 54 EX.
Angle between cams = 116°

Clearance in both cases = .013 so that timing should shew heavy accelerations only.

E.{Mr Elliott - Chief Engineer}
  
  


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