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).
Bench test results for an old standard coil and double ballast ignition system.
| Identifier | ExFiles\Box 69\1\ scan0067 | |
| Date | 21th October 1927 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 24) MP 306975 X.8710 ROLLS-ROYCE LTD. INSTRUCTIONS. To E.7.b. Order No. WC42 Customer's No. X 8710 Date 21-10-1927 Old Standard coil and double ballast. Tests have been made on the bench with the above combination running in conjunction with a standard battery ignition distributor with a make ratio set to .500. The HT spark gaps used were set to 5.5 m/m.{Mr Moon / Mr Moore} With the distributor running at normal speed i.e. 700 rpm sparking was OK both with a supply at 12 volts and 10 volts; at 8 volts misfiring occurred at all speeds. The maximum regular sparking speeds were as follows;- 12 volts - 1600 rpm of distributor 10 volts - 1000 rpm " " Signed H.E.W. This Sheet must be filed on completion of the work. | ||