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 the Spectre engine.
| Identifier | ExFiles\Box 4\1\ 01-page210 | |
| Date | 3rd January 1935 | |
| SPECTRECodename for Phantom III IGNITION ADVANCE CURVES S.P.8 CURVES TAKEN WITH TEST BED EXHAUST SYSTEM INLET & EXHAUST DISTRIBUTORS SYNCHRONISED INLET PLUGS LODGE 398 3 POINT EXHAUST PLUGS K.L.G. 808 2 POINT Hs.{Lord Ernest Hives - Chair} 1536 CAMSHAFT TIMING 030 c.i.d.e I.O. 7° PTDC. E.O. 48° BBDC. I.C. 53° PBDC. E.C. T.D.C. COMP-RATIO 6:1 DEGREES ADVANCE BEFORE T.D.C R.P.M 2% POWER DROP BY ADVANCE EXISTING ADVANCE CURVE E.57915 GOVERNOR SPRINGS MINIMUM ADVANCE FOR MAX POWER (IDEAL LINE) Hs.{Lord Ernest Hives - Chair}(14641) GOVERNOR SPRINGS 2% POWER DROP RETARD 3.1.35 | ||