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).
Engine performance test results comparing magneto and battery ignition systems.
| Identifier | ExFiles\Box 54\5\ Scan245 | |
| Date | 16th June 1923 | |
| Test 4. Redline No.1 spirit. Bar. 760 m {Mr Moon / Mr Moore} /m. Plug wires changed over. Magneto. 25° B.T.D.C. fully advanced. Pocket plugs. Battery. 15° P.T.D.C. fully retarded. Centre plugs. 50° B.T.D.C. fully advanced. | Engine R.P.M. | MAGNETO. | | | BATTERY. | | | |---| Load. | H.P. | Notch. | Load. | H.P. | Notch. | | 500 | 150 | 21.1 | - 23 | 151 | 21.3 | - 14 | | 750 | 147 | 31.1 | - 18 | 145 | 30.6 | - 12 | | 1000 | 140 | 39.6 | - 10 | 141 | 39.8 | - 8 | | 1250 | 130 | 45.9 | - 8 | 130 | 45.9 | - 8 | | 1500 | 116 | 49.2 | - 2 | 119 | 50.7 | - 8 | | 1750 | 105 | 51.9 | 0 | 108 | 53.4 | - 6 | | 2000 | 92 | 52 | 0 | 89 | 50.3 | - 4 | | 2250 | 79 | 50.2 | 0 | 79 | 50.2 | - 7 | | 2500 | 61 | 43.1 | 0 | Petrol run out. | | | Total mileage run during tests (dyno. wheels) = 278. C.H. Parkinson. 16.6.23. ADEVLC BOXFEX | ||