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 of ignition advance curves for a Peregrine No. 5 unit engine.

Identifier  ExFiles\Box 179b\2\  img233
Date  22th January 1941
  
① 500 DR. WTS. SPRINGS 3 COILS 13 S.W.G (.034)
SPRINGS SET TO JUST RETURN WTS.
② 500 DR. WTS SPRINGS 3 COILS 5 S.W.G (.072)
SPRING SET TO JUST RETURN WTS.
③ ACTUAL AUTOMATIC ADVANCE STANDARD GOVERNOR
500 DR. WTS. SPRINGS 5 COILS 18 S.W.G. .048

IGNITION ADVANCE CURVES. PEREGRINE Nọ 5 UNIT.

C/R 6.28
CAMSHAFT E100863 107° LARGE VALVE.
TURBULENT HEAD SINGLE S.U. 1 5/8" DIA. TESTBED EXHAUST
TIMING I.O. 8° B.T.C. E.O. 42 B.B.D.C.
I.C. 34. A.B.C. E.C. 5. A.T.C.

Y-AXIS: IGNITION ADV. FLYWHEEL DEGREES.
X-AXIS: R.P.M.

GRAPH LABELS:
MAX. ADV. AVOIDING AUDIBLE DETONATION
MIN. ADV. FOR MAX POWER.
5% DROP

P / 22.1.41
  
  


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