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).
Test report on H.T. cables, Champion plugs, Lucas windscreen wiper, and bulbs for a vehicle.
| Identifier | ExFiles\Box 168a\4\ img106 | |
| Date | 2nd December 1938 | |
| -5- H.T. Cables. EW.1242. The B.I. Helsby cables were removed en bloc after 13,434 miles, and on being tested were found to be electrically sound, however cables 2,3,4, and 6 show signs of cracking. The B.I. Neoprene H.T. cable, which we are hoping to standardise in the near future completed the remaining 4,242 miles, and when examined, were found to be both electrically and mechanically sound. This cable has all the good qualities of the Johnson & Phillips cables and shows a definite advantage on the ionisation rig. Shortened front tube to SCD.796 fitted, we recommend this for standardisation. Champion L.S.5. Plugs. Very satisfactory performance. Point wear .010" to .013" per 5,000 miles, and required resetting only once during the run. The electrode wear had taken place on the earth electrode. Lucas Windscreen Wiper. Removed after 17,970 miles, used approx. 20% of the test, operation satisfactory. The wear on the taper pivots was found to be negligible. Felt washers used for oiling the pivots were missing, new ones were fitted and the wiper refitted for further running. Bulbs. Burning out of the head lamp and pass bulbs was experienced. We are of the opinion that this was due to Messrs. Lucas attempting to increase the efficiency of their lamps and just over-stepping the mark. We have taken the matter up with their Laboratory. It was first thought that the regulator was set too high but further testing disproves this. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} If the R.R. distributor is fitted to the Bentley or Wraith engine, the shortened tube modification to SCD.796 will not be required; also the wiring L.O.P. is altered from EW.1285 to EW.1242. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||