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).
Page 3 of engine, clutch, and gearbox specifications.
| Identifier | ExFiles\Box 126\5\ scan0005 | |
| Date | 3rd July 1936 | |
| -3- Engine Cont'd.{John DeLooze - Company Secretary} Valve Timing - I.O. 16° BTDC. E.O. 56° BBDC. I.C. 56° PBDC. E.C. 16° PTDC. Ignition timing 12° BTDC. FULLY ADVANCED. Tappet clearances Inlet and Exhaust .006". Sparking Plugs 14 m/m.{Mr Moon / Mr Moore} Champion L - 10 Gap .018" to .020". Inlet Porting 2, 3, 5, 8, 10, 11. Exhaust " 1, 4, 6, 7, 9, 12. Exhaust manifold 6-port type - weight 18 lbs. 3 ozs. Inlet port size - 1.250". Exhaust " " - (oval shaped) 1.187 x 1.312". Inlet valve size 1.312". weight 3 ozs 3 grms. Exhaust " " 1.187". weight 2 ozs.22 grms. Angle of valve seats 30°. Valve spring loading 86 lbs. (outer spring) 51 lbs. (inner spring) 35 lbs. Free length of outer spring 3.000". " " inner " 2.400". Length of both springs valve closed 1.900". Weight of cylinder head complete 88 lbs. Clutch. Borg & Beck. Single plate dry disc type with knife edge fulcrum toggle levers. Gearbox. Built in unit construction with engine, synchromesh on 2nd, 3rd and top. | ||