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 | ||