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 B.M.E.P. variation with different valve timings for engine unit NA IV GB.
| Identifier | ExFiles\Box 5a\5\ 05-page147 | |
| Date | 18th October 1938 guessed | |
| V1161 B.M.E.P VARIATION WITH VALVE TIMING ("JAPAN") ENGINE UNIT NA{Mr Nadin} IV GB SPECIAL 120° LONG DURATION CAMSHAFT (5.85:1 COMP. RATIO) TWIN-CHOKE ZENITH CARB. LARGE BORE INDUCTION PIPE "A" TIMING "B" TIMING "C" TIMING Y-AXIS: B.M.E.P X-AXIS: R.P.M. TABLE: VALVE TIMINGS COLUMN HEADERS: "A" NORMAL, "B" 1 TOOTH LATE, "C" 1 TOOTH EARLY INLET OPENS: 12.5° ATDC, 20-4 ATDC, 4-6 ATDC INLET CLOSES: 52.5° ABDC, 60-4 ABDC, 44-6 ABDC EXHAUST OPENS: 46.5° BBDC, 40.5 BBDC, 52.5 BBDC EXHAUST CLOSES: 6.5° BTDC, 2.5 ATDC, 18.5 BTDC | ||