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).
Graph comparing ignition advance curves for a 20/25 engine with different governor setups.

Identifier  ExFiles\Box 27a\1\  Scan201
Date  17th February 1934
  
20 25 HP
IGNITION ADVANCE
UNIT C.10.
6.3:1 COMP. RATIO
OTHERWISE STANDARD 20/25 ENGINE
1) IDEAL CURVE (MIN. ADVANCE FOR MAX. POWER)
2) ACTUAL AUTO-ADVANCE BENTLEY GOVERNOR (INITIAL SETTING 16° BTDC)
3) ACTUAL AUTO-ADVANCE 20/25 GOVERNOR
DEGREES B.T.D.C. (FLYWHEEL)
R.P.M. (ENGINE)
500, 1000, 1500, 2000, 2500, 3000, 3500
10, 20, 30
C.T.S.
  
  


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