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).
Causes of engine misfiring at slow speed and full throttle, focusing on ignition system resistance.
| Identifier | ExFiles\Box 60\3\ Scan146 | |
| Date | 6th April 1932 | |
| X6095 PN.{Mr Northey}5/WT6.4.32. S/W. Hs{Lord Ernest Hives - Chair}/Wst... from PN.{Mr Northey} Copy to Sg.{Arthur F. Sidgreaves - MD} E.{Mr Elliott - Chief Engineer} By.{R.W. Bailey - Chief Engineer} Car Electrical Work. Ignition. Referring to R.1/M2.4.32. R.{Sir Henry Royce} points out that it is only at slow speed, full throttle that the trouble of misifirng occurs, and suggests this may be due to certain causes. I would like to remind those concerned that the trouble may not be due to any leakage or alternative path whatever, but merely due to the insufficient EMF. generated in the secondary winding to overcome the very much higher resistance between the sparking-plug points, resulting from the compressed charge being at its highest degree of compression, which is possible to occur over the whole range of engine speed, i.e. full-throttle and no wire-drawing. Experiments I made in the past showed that the increase of resistance of a gas under compression went up very quickly with increased compression, although I have no figures on the subject with me - doubtless you have a curve illustrating this. PN.{Mr Northey} | ||