Rolls-Royce Archives
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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).
Blueprint graph comparing different engine timing configurations found by experiment.

Identifier  ExFiles\Box 13\2\  02-page104
Date  17th June 1931 guessed
  
COMPARISON OF TIMING APPROXIMATING TO L.E.C. 2918 & BEST TIMING FOUND BY EXPERIMENT
HS{Lord Ernest Hives - Chair} 379
H.{Arthur M. Hanbury - Head Complaints} 379
A TIMING APPROX. TO L.E.C. 2918. 1/4" SHAFT
B BEST TIMING R.{Sir Henry Royce} ENGINE, CAMS 110° SHAFT
C AS 'B' BUT TAPPET CLEARANCE ADJUSTED TO GIVE BEST RESULTS.
CLAUDEL CARB. 4.9 C.R.
ALUM. HEAD. OPEN EX.
B.H.P.
R.P.M.
.020" TAPPET CLEARANCE
Timing Wheel A: A, Ex, IN, 12, 14, 60, 65.6
Timing Wheel B: B, Ex, IN, 17, 18, 59, 56, 70
Timing Wheel C: C, Ex 236, IN 256 110, 9, 18, 48, 58
  
  


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