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 testing for a Delco Remy Battery Ignition Head, focusing on friction, hysteresis, and drive slack.
| Identifier | ExFiles\Box 163\7\ img282 | |
| Date | 26th February 1936 | |
| 86018 (Handwritten) WET- Presume you are answering this (Initial) Am (Initial) Rm{William Robotham - Chief Engineer} HS.{Lord Ernest Hives - Chair} c.Wor.{Arthur Wormald - General Works Manager}By.Hs{Lord Ernest Hives - Chair}/Wst. BY/RD. re Testing Delco Remy Battery Ignition Head. The ignition governor mechanism on the Delco Remy unit is constructed on entirely different lines as we know to the governors designed by ourselves and fundamentally should have much more inherent friction. The effect of this friction would naturally be to introduce a lag or hysteresis in the ignition advance curves plotted against increasing and decreasing engine speed. As to the significance or disadvantage of this we have yet to learn, but firstly we should like to have a bench test made determining how much it is, and this should be done with the governors both in the lubricated and dry or neglected conditions. A further test we think ought to be made is the measurement of the slack involved in the drive between the L.T. cam and the driven wheel dealing with this drive in the Wheelcase, that is, comparing the 25-30 with the Delco Remy. E.{Mr Elliott - Chief Engineer} (signature) | ||