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).
Report page detailing the performance of an ignition system, including current consumption, ballast resistance, and experimental results for a Remy 12 system.
| Identifier | ExFiles\Box 52\3\ Scan290 | |
| Date | 11th December 1917 | |
| Contd. -2- EFC {E. Fowler Clarke - Electrical Engineer} 2/T11.12.17. The observed average current consumption is also plotted and may be compared with the calculated. The curve will be seen to be less steep, which is a desirable feature and due to the use of a ballast whose resistance increases with increasing current, and so tends to equalise. A similar curve of observed average consumptions is also plotted for Remy 6. This is more nearly similar to the calculated curve, the ballast resistance on Remy 6 being a much smaller proportion of the whole primary resistance. The stored magnetic energy available for spark production is proportional to the square of the current at break and therefore decreases fairly rapidly as the speed of operation increases. Thus, even if the contact breaker operated as perfectly at high speeds, as at dead slow, there would come a speed at which the secondary spark would fail. Experimental results for Remy 12. Primary gaps .020" Secondary " 5 mm. In addition to plotted results of observed consumption, the following were noted. There was very little sparking at primary points at any speed. Signs of secondary missing began at about 1100 R.P.M. The missing got gradually worse and worse until at 1700 R.P.M. there were only occasional sparks. Contd. | ||