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).
The power output and torque curve for the E.A.C. engine fitted with a 40/50 HP carburetter.
| Identifier | WestWitteringFiles\K\September1923\ Scan74 | |
| Date | 24th September 1923 | |
| ORIGINAL SECRET To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. Hs{Lord Ernest Hives - Chair}4/LG24.9.23. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. X4606 The following is the best HP. curve we have so far obtained from the above engine :- E.A.C. POWER OUTPUT - with 40/50 HP. Carb. By adjusting carb. for each speed. | R.P.M. | Lbs. | M.E.P. | B.H.P. | |--------|-------|--------|--------| | 500 | 143.5 | 104 | 29.95 | | 750 | 140 | 102 | 43.75 | | 1000 | 140.5 | 102.2 | 58.6 | | 1250 | 132 | 96 | 68.75 | | 1500 | 128 | 93.2 | 80 | | 1750 | 123 | 89.7 | 89.75 | | 2000 | 115.5 | 84.1 | 96 | It will be seen that we are getting very good power at low speeds but it falls off more rapidly than it should do at high speeds. The excellent torque at low speeds proves the distribution is very good. Up to the present we have run this engine fitted with a standard 40/50 HP. Carburetter. Hs.{Lord Ernest Hives - Chair} | ||