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 feed and consumption tests for the Phantom and Silver Ghost models.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan302 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS{Lord Ernest Hives - Chair}/ACL/LG15.12.25 FURTHER EXPERIMENTS WITH 3 OIL FEEDS ON PHANTOM AND TESTS ON SILVER GHOST. Reviewing the question of overoiling on the Phantom we know from the results of various tests we have made, both on the test bench and on the road, that one of the chief factors governing oil consumption is the rate of discharge through the bearings. We realise that this is not the only factor because we have shewn previously the part played by the rings and the lesser part by the pistons. We are already using the most efficient rings of which we know, the results of which although excellent when new, quickly show loss of efficiency when wear takes place. Therefore it seems we should direct our attention to means of reducing the leakage through the bearings. The effect of oil leakage through the bearings is perhaps more easily appreciated by reference to the results of road tests than for figures taken from bench tests. We therefore give here a curve showing how the consumption was increased on a Silver Ghost by increasing the oil pressure, which was simply a means of increasing the oil leakage. It may seem perhaps that some of the pressures are unduly high, but for this particular car tested a pressure of 125 lbs/sq.in. resulted in only the same aggregate oil flow through the bearings as a pressure of 17 lbs/sq.in. on the Phantom used for these tests contd :- | ||