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).
Mileage and fault log from experimental tests conducted in 1925.
| Identifier | ExFiles\Box 71\4\ scan0164 | |
| Date | 8th May 1925 | |
| - 7 - Date. | Tested by.{R.W. Bailey - Chief Engineer} | Miles run. | Total miles. | Remarks. 4.4.25. to 10.4.25. | Exp. tests in France. | 2,915 | 2,915 | Hole chaffed in oil pipe supply to engine gears by front engine guard. Engine fabric coupling started to give in two places. 11.4.25 to 15.4.25. | | 2,532 | 5,447 | No. 2 conrod journal white metal bearing ran out. No. 1 conrod journal white metal bearing found cracked. Bottom corner of steering column flange, nearest engine, found broken. 2.4.25 to 8.5.25. | | 7,285 | 12,732 | No. 6 conrod white metal bearing ran out. No. 1 conrod - sections of white metal flange broken, metal loose in cap, was cracked & had run. No. 3 conrod - slight crack in rod bearing. No. 4 conrod cracked rather badly. No. 5 conrod O.K., except for groove scored round it by some foreign matter. Average speed throughout test. 40.66 m.p.h. Petrol consumption. 11.57 m.p.g. Oil consumption. 192.06 m.p.g. Max. speed attained. 75 m.p.h. | ||