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).
Specifications for magneto timing, sparking speed, and contact breaker lever operation.
| Identifier | ExFiles\Box 43\4\ Scan037 | |
| Date | 14th December 1926 guessed | |
| -3- Contd. A.{Mr Adams} 150 r.p.m. for the fully advanced position of the timing lever. B. 190 r.p.m. for the central position. C. 230 r.p.m. for the fully retarded position. Note:- The minimum regular sparking speed can be taken to be that speed at which 100 consecutive sparks, without missing, are given by the magneto at some time within a period not greater than 5 minutes. (8) The timing of the magneto break shall not be varied more than ±4º by altering the primary point gap ± .002" from normal respectively. (9) The tangential force necessary to advance or retard the contact breaker lever with the cover in position shall lie between the limits 5 to 8 lbs. wt. (measured at lever pin radius). EFC. | ||