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).
Required modifications and observed issues with the J. 3. motor.
| Identifier | ExFiles\Box 179\3\ img139 | |
| Date | 1st April 1932 | |
| -2- HE/Wst.3/H.L. 4.32. cont'd.{John DeLooze - Company Secretary} With regard to the existing J.{Mr Johnson W.M.} 3. motor, in order to get this in running order for the first chassis, we require the teazer field winding modified as suggested and we should be glad if W. will also arrange to instruct this as soon as possible as the motor is of no use in its present state. Examining the J.{Mr Johnson W.M.} 3 motor in detail we have observed the following points which we send along for your consideration. (a) The pinion bearing owing to the high ratio is too large in diameter making the frictional losses excessive and the teazer motion poor. (b) The method adopted for bearing lubrication we consider to be unsatisfactory in that there is no reservoir to feed the felt pad which also is not spring loaded. (c) The terminals we would like to see enclosed like the Bosch and the terminal insulator, have a waterproof fitting. (d) This motor is still not waterproof as we had hoped with the self lubricating bearing feature. (e) The driving end bearing plate would be better in steel as we had a suspicion when the motor was fitted preliminarily to the engine that the present aluminium end plate distorted. In other directions i.e. production economy etc., we consider the motor is an improvement in design over the P.2 starter. In order to get a comparison with an axial engagement motor of a similar size to J.{Mr Johnson W.M.} 3 we are arranging to carry out tests on a Bosch motor we have in the laboratory. HE/Wst. | ||