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 discharge from Phantom engine bearings, comparing results with and without grooves in the intermediate bearings.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan305 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REFHs/ACL/LG151225 [Graph] Graph Title: OIL DISCHARGE ON PHANTOM WITH 3 MAIN OIL FEEDS. WITH & WITHOUT GROOVES IN THE INTERMEDIATE BEARINGS. [RE 25] Left Y-Axis: OIL DISCHARGE Pts/MIN Right Y-Axis: %AGE REDUCTION X-Axis: R.P.M. Graph Labels: AVGE PRESS 30LBS/SQ IN TEMP OF SUPPLY TO BRGS 60°C WITH STD OIL GROOVES IN INTERMEDIATES WITH PLAIN INTERMEDIATES %AGE REDUCTION DIA. 3 [Text Body] The graphs given here show the reduction in leakage resulting from omitting these grooves for the particular engine tested at an average oil pressure of 30 lbs/sq.in. Apart from any advantage which may be gained by reverting to the Silver Ghost and 20 HP. practice of three main bearing feeds only, no disadvantages can as be foreseen. Years of experience with the Silver Ghost as well as the recent 10,000 miles test with the Phantom in France, and which has been running under these conditions - show that there is no apparent reason why the same practice should not be equally as successful on the Phantom and we have not yet found any advantage possessed by the seven feed system which are not possessed by the three. It was pointed out in the previous report that the smaller the leak past the bearings, the higher the temperature rise of the oil but it seems that we can go a considerable way yet in the further reduction of oil leak without running into bearing troubles due to temperature. Our connecting rod bearing tests go to prove this where it will be remembered the oil was deliberately fed to the bearings at a temp. of 100°C. When running at 3000 r.p.m. with contd :- | ||