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 showing BMEP variation with increased tappet clearance against RPM.
| Identifier | ExFiles\Box 5a\5\ 05-page143 | |
| Date | 18th October 1938 | |
| BMEP VARIATION (18.10.38) WITH INCREASED TAPPET CLEARANCE V1148 BMEP Loss/Gain RPM INLET VALVES .010 EXH. VALVES .020 INLET VALVES .010 EXH. VALVES .060 INLET VALVES .060 EXH. VALVES .100 ENGINE NO. R.M.3 105° LONG DURATION CAMSHAFTS P.V. 12 EXHAUST SYSTEM TAPPET CLEARANCE TIMING CHECKED (0.006 INCH) VALVE TIMING (.020" CLEARANCE) I.O. 12.5° ATDC E.O. 44.8° BBDC I.C. 52.5° ABDC E.C. 6.2° BTDC | ||