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).
Experimental results for the Remy 6 ignition system, detailing primary and secondary spark characteristics.
| Identifier | ExFiles\Box 52\3\ Scan291 | |
| Date | 11th December 1917 | |
| H.R. 233 a (100 T) R.V. 246 6-8-19: G 2469 Contd. -3- EFC {E. Fowler Clarke - Electrical Engineer} 2/T11.12.17. Experimental Results for Remy 6. Primary gaps .028" Secondary " 5 mm. In addition to plotted results of observed consumption, the following were noted. There is considerably more sparking than on Remy 12, (Due to position of condenser, see under section (4).). The primary spark seems to consist of two parts in the main :- (a) A soft arcy portion like that due to breaking an inductive circuit. (b) A "splashy" portion like that due to making and breaking the connection to a low tension condenser. At break (a) and (b) seems both to exist and at make there is at the higher speeds evidence of a slight spark of the (b) type, as was proved by using a revolving disc containing apertures which allowed vision at the instants of make only. (This can be seen normally on a magneto, owing to the rotation of the contact breaker). At low speeds the sparking at the points is comparatively slight, but increases with the speed, especially in the case of the "splashy" portion. The first signs of missing secondary sparks occurred at about 1150 R.P.M. and this gets worse until at 1400 R.P.M., the secondary sparks fail completely. | ||