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).
Coil tests to determine maximum running temperature and performance effects.
| Identifier | ExFiles\Box 164\5\ img392 | |
| Date | 25th August 1938 | |
| To Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/WB.{Mr Brazier/Mr Bell}1/JH.25.8.38. Coil Tests to determine the maximum running temperature and the effect on performance. Six coils were tried on 24.G.VI as follows. Lucas sports type. Delco. R.R. 20,000 turn. R.R. I.N.3. (R.R. Delco). R.R. P.III. Runbaken oil filled. We give herewith the type of coil fixing max. temperature attained and the performance under road conditions. The time temperature rise curve by Rm{William Robotham - Chief Engineer}/Childs. It will be seen from the results that the three R.R. coils tried gave satisfactory road performance, but the (R.R. Delco) in metal case gave a high max. temp. The Delco coil misfied on each side of the tests as the internal heat increased. The frame fixing gave a reduced max. temp. but the heat resisting washers were of no value. The Lucas Sports coil gave a satisfactory road performance, and a low max. temperature. The Runbaken oil filled coil missed five on pick up towards the end of the test when the heat of the coil had attained a maximum. We have tried the Lucas Sports coil and the R.R. 20,000 turn for cold starting on 28.G.VI with the cold chamber at 8°F.{Mr Friese} and both gave a satisfactory start. We suggest that since our last tests on cold starting, an improved carburation and choke control has enabled us to start with the R.R. 20,000 turn coil. Rm{William Robotham - Chief Engineer}/WB.{Mr Brazier/Mr Bell} | ||