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).
Dynamometer test comparing a Magneto ignition system with a Goshawk battery ignition system.
| Identifier | ExFiles\Box 54\5\ Scan243 | |
| Date | 14th June 1923 | |
| X3485 14/15 June 1923. Test to find correct position for Battery Ignition. MAGNETO v. {VIENNA} GOSHAWK IGNITION. 40-50 Chassis 49-GB. Cut-out closed. Radiator 75°C. 15 X 52 axle (i.e. 1 rev. of engine = .198 of dyno.) Dynamometer Test No.1. Shell Mex spirit. Bar. 762 m {Mr Moon / Mr Moore} /m. Magneto. 22° B.T.D.C., fully advanced - centre plugs. Battery. 20° P.T.D.C., fully retarded - pocket plugs. 45° B.T.D.C. " advanced. | Engine R.P.M. | MAGNETO. | | | BATTERY. | | | |---|---:|---:|---:|---:|---:|---:| | | Load. | H.P. | Notch. | Load. | H.P. | Notch. | | 500 | 146 | 20.6 | - 16 | 139 | 19.2 | - 7 | | 750 | 144 | 30.5 | - 10 | 141 | 29.9 | - 4 | | 1000 | 134 | 37.8 | - 6 | 124 | 35.0 | 0 | | 1250 | 121 | 42.7 | - 2 | 117 | 41.3 | 0 | | 1500 | 114 | 48.3 | 0 | 108 | 45.8 | 0 | | 1750 | 104 | 51.4 | 0 | 98 | 48.5 | 0 | | 2000 | 96 | 54.3 | 0 | 88 | 50.7 | 0 | | 2250 | 81 | 51.6 | 0 | 83 | 52.8 | 0 | | 2500 | 59 | 41.7 | 0 | 70 | 49.5 | 0 | | ||