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).
Spark plug adjustments to improve engine performance at slow and high speeds.
| Identifier | ExFiles\Box 54\5\ Scan195 | |
| Date | 2nd June 1922 | |
| Contd. -2- R5/M2.6.22. supplied with the car in which the Lodge central electrode is shrouded with porcelain and not a skirt as in the earlier types. In an endeavour to get better slow running, the points of the plug were set at .030" apart - with half-break and half- make the engine still fired full throttle up to a very high speed without missing. R. {Sir Henry Royce} | ||