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).
The initial testing and measurement of a U.S.A. Bosch battery ignition system.
| Identifier | ExFiles\Box 61b\4\ scan0064 | |
| Date | 5th September 1921 | |
| To R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} from EFC. c. to CJ. & PN.{Mr Northey} c. to By.{R.W. Bailey - Chief Engineer} & EP.{G. Eric Platford - Chief Quality Engineer} c. to Rg.{Mr Rowledge} & Da.{Bernard Day - Chassis Design} c. to R.R. of America Inc. X.4275 - U.S.A. BOSCH BATTERY IGNITION. X.3485 We have had very little opportunity so far for conducting any experimental work on the bench with the U.S.A. Bosch battery ignition. Of the two sets which have been received (one of which was brought over by Mr. Hives and the second one of which came over on 4-EX) one distributor is at West WitteringHenry Royce's home town and the other has been in constant use on experimental cars. We are, however, expecting shortly to receive three more of these sets, when all the quantities of this ignition will be investigated. We have, however, made a few measurements on the coil and the condenser. We found the resistance of the coil to be approximately similar to our standard (slightly less). The inductance is rather less than half that of our standard. As regards the condenser, a test of this showed the capacity to be .5 mf, - our present standard is .215 (average). We found the Bosch condenser to have practically no leakage conductance when cold, but after working on 200 volts AC 50~ for some time, the condenser heats up due to di-electric losses, allowing quite a large current - about 1/3 of an ampere - to flow. With regard to Mr. Royce remark about the Contd. | ||