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 for the 19-EX vehicle with varying exhaust configurations.
| Identifier | ExFiles\Box 11\4\ 04-page121 | |
| Date | 21th July 1932 | |
| X7941 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hotel de France, Chateauroux, FRANCE. MAXIMUM SPEED TEST. 19-EX. All tests taken with 5.25/1 compression ratio, cylinder head. Taken over same stretch of road as previous tests. Practically no wind was blowing. Camshaft E.82448. Valve Timing. I.O. 5.38° P.T.D.C. I.C. 54.75° P.B.D.C. E.O. 11.16° P.T.D.C. E.C. 46.5° B.B.D.C. One driver & passenger. Ignition. Magneto 7° B.T.D.C. Battery 12° B.T.D.C. Axle Ratio 12 X 41. Wheels 19" Ballast in rear 110 lbs. Carburetter Needle 85° Tests taken with intermediate exhaust pipe taken off leaving an open exhaust from the front expansion chamber. IN. secs. OUT. secs TOTAL. secs M.P.H. 21.2 20.8 42.0 85.72 21.2 21.0 42.2 85.31 20.8 20.6 41.4 86.96 Intermediate pipe refitted. Test repeated with cut-out open - IN. secs. OUT. secs. TOTAL. secs M.P.H. 21.2 21.2 42.4 85.09 With cut-out closed - IN. secs. OUT. secs. TOTAL. secs M.P.H. 21.4 21.2 42.6 84.5 G.W.H. | ||