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).
Experimental report, page 3, detailing cylinder leaks, component breakages, and performance data from a running test.
| Identifier | ExFiles\Box 43\1\ Scan072 | |
| Date | 1st February 1925 | |
| R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. -3- Expl. No. REF. HS{Lord Ernest Hives - Chair}/TAG/LG2. 2. 25. EXPERIMENTAL REPORT. started leaking. Five of them leaked at the welding of the patch under the exhaust port, and in each case the leak started where the jacket starts to curve to go over the exhaust port (see sketch). These cylinders have completed 78 hrs. running since new. SUMMARY OF BREAKAGES ETC. VALVE SPRINGS. 11 hrs. A.2. outer exhaust valve springs. 27 hrs. A.4. " " " " B.2 " " " " 43.5 hrs. B.1. " " " " A.1. " " " " B.1. inner " " " A.1. " " " CYLINDER JACKETS. 29 hrs. B.6. cyl. jacket around inlet port. 32 hrs. B.3. " " on exhaust side. 48 hrs. B.3.4.5.6. " " " " B.1. cyl. " " inlet side. A.4. " " " exhaust side. 27 hrs. one of A.{Mr Adams} side Magnetos failed. Average oil consumption. 1st. day. Pts/HP/hr. 2nd. day. Pts/HP/hr. 3rd. day. Pts/HP/hr. 4th. day. Pts/HP/hr. " 5.63 6.4 6.4 6.7 Average pet: consumption. .56 .56 .56 .56 Average R.P.M. 1800 1800 1800 1800 Full throttle reading at finish. 1865 1830 Mag. failed. 1870 1870 contd :- | ||