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).
Test where an ignition coil misfired at high speeds and the subsequent investigation and proposed solutions.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page237 | |
| Date | 1st September 1913 | |
| COPY. X50 COPY. X.50 X562 R7/P 1.9.13. To Wor.{Arthur Wormald - General Works Manager} from R.{Sir Henry Royce} Copy for J.{Mr Johnson W.M.} With reference to the coil on 2301, when testing this the other day, I found it missing fire very badly at high speeds. Hurst informs me that the ignition was con-nected to three Edison cells, which according to the Edison figures are only expected to give 1.2 voltage each. This fault was cured by increasing the number of cells to which the coil was attached. We do not expect our coil, with the ignition plugs at .025", to give sufficient electric motive force to overcome this gap with an engine having rather greater compression, unless the low tension contact makes contact longer than the usual period. We must therefore reduce the distance be-tween the pints or increase the electric motive force if we want the coil to work at high speed. R.{Sir Henry Royce} (Sgd) F.H.R. Waiting for 6 volt model and smaller size model. | ||