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).
Tests to prevent the inner piston in the ignition relay from sticking due to oil impurities.
| Identifier | ExFiles\Box 65\1\ scan0090 | |
| Date | 28th February 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. +8688 REF: Hs{Lord Ernest Hives - Chair}3/LG28.2.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} SECRET. EAC. OIL RELAY GOVERNOR. We have carried out a number of tests to determine whether we could obviate all possibility of the small inner piston in the ignition relay sticking, due to impurity in the oil. The test we used was introducing fine dust directly in the pipe running to the relay. When the oil was cold, we tried various gauzes up to 100 mesh - none of them were successful in preventing the piston seizing. With the oil hot, there was very much less tendency for the piston to stick. We suggest that if it was arranged that there was a proper settling chamber which would encourage the dirt to settle out of the oil, this would be more efficient than trying to obtain the same results by means of gauzes. These results have confirmed our past experience and that is, provision should be made for the dirt to settle out of the oil and be so trapped that it is not again put into circulation. This also applies to petrol filters. Hs.{Lord Ernest Hives - Chair} | ||