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).
Tests of a 118º low lift camshaft on an EAC engine No.1-EAC-11.
| Identifier | ExFiles\Box 180\M3\M3.4\ img029 | |
| Date | 17th September 1924 | |
| B.R. 493A (40 H) (SL 42 12-7-23). J.H. D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. REF Hs{Lord Ernest Hives - Chair}/GHP/LG17.9.24. RESULTS OF TESTS WITH 118º LOW LIFT CAMSHAFT ON EAC ENGINE NO.1-EAC-11. Conditions :- 1.500" longer rods. Camshaft E.71994 118º. Pistons E.72195 R = 4.8/1. EAC. Carburetter with alum: air valve. Scintilla Magneto with automatic advance. 1.000" packing under cyl. block. Twin exhaust system. Alum: Induction Pipe. Power curves. .010" tappet clearance. Valve timing used I.O. 12.6º P.T.C. E.O. 59.7º B.B.C. I.C. 41.2º P.B.C. E.C. 3.6º P.T.C. Tappet clearance for tests .004". C.O. closed. C.O. open. High lift Cam. R.P.M. | Lbs. | B.HP. | Pts/hr. | Lbs. | B.HP. | Lbs. | B.HP. | % diffmce: 2750 | | | | | 118 | | 104.5 | 2500 | 113 | 117.7 | 73.7 | 119.5 | 124.5 | 121 | 126 | 1.2% 2250 | 123 | 115.2 | 72.5 | 131.5 | 123.5 | 133 | 124.8 | 1.0% 2000 | 133.5 | 110.7 | 68.4 | 139.5 | 116.2 | 141 | 117.5 | 1.1% 1750 | 139 | 101.3 | 62 | 142.5 | 103.5 | 146.5 | 106.9 | 2.2% 1500 | 142 | 88.7 | 59 | 144.5 | 90.3 | 148 | 92.5 | 2.3% 1250 | 144 | 75 | 46.8 | 145.0 | 75.5 | 148 | 77.3 | 2.3% 1000 | 140 | 58.3 | 40 | 143 | 59.5 | 146 | 60.8 | 2.1% 750 | 142 | 44.3 | 31.9 | 143 | 44.7 | 146 | 45.6 | 2.0% 650 | 144 | 39 | 27 | 146 | 39.5 | 148 | 40.7 | 2.6% | ||