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).
Maximum speed tests and engine timing adjustments conducted in France.
| Identifier | ExFiles\Box 11\4\ 04-page107 | |
| Date | 16th July 1932 | |
| Y7941. To Hs.{Lord Ernest Hives - Chair} From G.W.H. Hotel de France, Chateauroux, FRANCE. 16.7.32. 19-EX. We have managed to obtain the maximum speed on a level 1/2 mile of good surfaced road. (Work on 60.JS{Mr Johnson's Secretary} has delayed this test). We are of the opinion that after advancing the timing one tooth the performance of the car is down, also the roar from the carburetter is more pronounced. Everyone concerned is of the opinion that the engine is rougher. We are going to alter the timing back to its original setting, and the maximum speed taken again. The following are the speeds taken and the conditions. The half mile is an level as we can find. There is sufficient approach to obtain speed, and sufficient afterwards for retarding. One mile from the measured section, the car is travelling at 60 m.p.h. This is to check any discrepancies, and the car is run both ways. Valve Timing I.O. 1.86° B.T.D.C. I.C. 46.88° P.B.D.C. E.O. 54.4° B.B.D.C. E.C. 4.65° P.T.D.C. Carb. needle 90° Ignition, Magneto 7° B.T.D.C. Battery 12° B.T.D.C. Camshaft E.82448. Time for flying 1/2 mile. IN. OUT. AVERAGE SPEED. 21.8 secs 21.2 secs 83.71 m.p.h. 22.2 secs 21.8 secs 81.81 m.p.h. Total Average 82.76 m.p.h. One driver & passenger. Axle ratio 12 : 41. Wheels 19" Ballast in rear 110 lbs. G.W.H. | ||