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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).
Optimal timing specifications for a new camshaft, part number E.82448 1140, including a timing diagram.

Identifier  ExFiles\Box 13\2\  02-page167
Date  13th December 1932
  
By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
c. to E.{Mr Elliott - Chief Engineer}
c. to MX.{John H Maddocks - Chief Proving Officer}

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/MA.13.12.32.

TIMING NEW CAMSHAFT E.{Mr Elliott - Chief Engineer} 82448 1140.

We have established that the best results are obtained with a timing (measured with .020 tappet clearance) where the inlet valve does not open earlier than 2° B.T.C. or close later than 6° A.T.C.

The timing, measured at the mean of these two positions, is approximately:-

[Diagram Labels]
2 9
Ex 50
IN 50
.020

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


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