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).
Oil relay ignition governor, detailing performance issues and proposed solutions.
| Identifier | ExFiles\Box 65\1\ scan0106 | |
| Date | 6th April 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X8685 REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LGK6.4.25. To BY/SS.{S. Smith} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to RHC.{R. H. Coverley - Production Engineer} OIL RELAY IGNITION GOVERNOR. We have tested a production oil relay under normal working conditions on the car, i.e., oil pressure 25/30 lbs. per sq.in. Its performance under these circumstances is only slightly below specification. We attach a curve from this governor and a report from RHC.{R. H. Coverley - Production Engineer} on the fitting. We understand that the works have been experiencing difficulty in inducing the governors to perform correctly since Spring E.73203 was fitted. We cannot understand this, as it should be no more difficult to make a governor function with this spring than with those previously tried. We believe the trouble has occurred since the inner return spring E.72497 has been fitted. This has put up the load to be overcome by the relay 50%. In consequence, any leakage passed the cup leather is liable to cause immediate trouble. This will be more especially the case on production test which has been purposely rendered as severe as possible i.e., low oil pressure and low oil viscosity. We suggest that the best way for works to overcome this trouble is to ensure that the cup leathers are a rather tighter fit than that specified in our memo. of 28.1.25. and that the depth of the leather is as recently instructed by E.{Mr Elliott - Chief Engineer} If these precautions are taken we believe that the advance curve will be obtained correctly. contd :- | ||