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).
Performance graph for the 25/30 HP engine showing Economy and Ignition Advance at Part Throttle.
| Identifier | ExFiles\Box 147\5\ scan0120 | |
| Date | 9th December 1936 | |
| 25/30 H.P. ECONOMY (IGNITION ADVANCE AT PART THROTTLE) C.16. S 12. Dec 9 1936. Y-AXIS LEFT: PTS/BHP/HR, B.M.E.P X-AXIS: R.P.M. Y-AXIS RIGHT: SPARK POSITION DEGREES B.T.D.C. (FLYWHEEL) LEGEND: FULL LOAD ① B.M.E.P (FULL THROTTLE) ①A GOVERNOR ADVANCED IGNITION ONLY (TO GIVE MAX. POWER) ①B SPEC. CONS. (WEAKEST MAINTAINED MAX. POWER) HALF-LOAD ② B.M.E.P (PART THROTTLE) ②A GOVERNOR ADVANCED IGNITION ONLY. ②B SPEC. CONS. (WEAKEST MAINTAINED MAX. POWER) HALF-LOAD ③ B.M.E.P (PART THROTTLE) ③A GOV. ADV. IGN. + NECESSARY ADJ. TO GIVE MAX. POWER. ③B SPEC. CONS. (WEAKEST MAINTAINED MAX. POWER) C.T.S. | ||