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).
Ignition advance curves for a Peregrine Nº 5 Unit engine test.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page246 | |
| Date | 22th December 1932 | |
| ① 500 DR. WTS. SPRINGS 3 COILS 13 S.W.G. (.094) SPRINGS SET TO JUST RETURN WTS. ② 500 DR. WTS. SPRINGS 3 COILS 15 S.W.G. (.072) SPRINGS SET TO JUST RETURN WTS. ③ ACTUAL AUTOMATIC ADVANCE STANDARD GOVERNOR 500 DR. WTS. SPRINGS 3 COILS 18 S.W.G. .048 IGNITION ADVANCE CURVES. PEREGRINE Nº 5 UNIT. C/R 6.28 CAMSHAFT E100863 107° LARGE VALVE. TURBULENT HEAD SINGLE S.U. 1 5/8" DIA. TESTBED EXHAUST TIMING 10.8° B.T.C. E.O. 42 B.B.D.C. I.C. 34 A.B.C. E.C.S. A.T.C. Y-Axis: IGNITION ADV. FLYWHEEL DEGREES. X-Axis: R.P.M. Graph Annotations: MAX. ADV. AVOIDING AUDIBLE DETONATION MIN. ADV. FOR MAX. POWER. 5% DROP | ||