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).
Power curve graph for a Bentley III engine, showing B.HP and B.M.E.P. against R.P.M. for various valve configurations.
| Identifier | ExFiles\Box 10\3\ 03-page147 | |
| Date | 1st June 1938 | |
| R.P.M. B.M.E.P. B.H.P. BENTLEY III POWER VALVES. B. III. No. 1 UNIT S42 ① CYL. HEAD EX 129685 (CAP 134.5 cc's) INLET VALVE: 1.5 EX. 29686 EXH. ": 1.3 EX. 29687 5.85:1 COMP. RATIO ② AS ① BUT WITH INLET VALVE: 1.6 E.W. 1429 EXH. VALVE: 1.3 EX. 29687 (MOD. EX 31328) (CAP. 130 cc's) 6.0:1 COMP. RATIO ③ AS ① BUT WITH INLET VALVE: 1.6 EW 1429 & EXH. ": 1.4 E 61299 (MOD. EX 31328) (CAP. 130 cc's) X TAPER THROATS ④ AS ① BUT WITH INLET VALVE: 1.6 EW 1429 & EXH. ": 1.4 E 61299 (STD. THROATS) (CAP. 130 cc's) NOTE:- THE SAME CYL. HEAD IS USED THROOUT BEING MODIFIED IN STAGES FROM SMALL VALVE TO STD. VALVE HEAD. OPEN EXHAUST JUNE 1938 | ||