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).
Experiments comparing bakelite and metallic ignition wiring tubes for static induction and temperature effects.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan041 | |
| Date | 23th May 1930 | |
| To R.{Sir Henry Royce} from EFC. c. Sg.{Arthur F. Sidgreaves - MD} c. Hy.{Tom Haldenby - Plant Engineer}. E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Wor.{Arthur Wormald - General Works Manager} ORIGINAL EFC/AD23.5.30. X.3714. X.4119. BAKELITE IGNITION WIRING TUBES. STATIC INDUCTION EFFECTS. Experiments have been made both on the bench and on the road with all bakelite ignition wiring tubes in comparison with metallic wiring tubes as applicable to Phantom II. The detailed results on the bench were quantitatively such that it could not be decided with certainty therefrom as to whether the static induction effect would be apparent on the car, though it certainly appeared unlikely and particularly in view of the fact that we are not troubled with this phenomenon on the 20/25. Accordingly a test was made on the road (on 22-EX) with these experimental wiring tubes of all bakelite. Although the tests were fairly exhaustive no sign of any irregularity was observed which would suggest that electro statically induced sparks were occurring on the plugs at any instant other than on the particular one firing. No misfiring or spitting back in the carburetter was observed. In regard to the capability of these bakelite tubes of withstanding the effect of temperature, suitable tests have also been made. Heating such a tube in an oven for one hour at 150°C. no change was observed in the condition. | ||