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).
Summary of faults recorded during a 15,447-mile test on Chassis 93 NK.
| Identifier | ExFiles\Box 71\4\ scan0211 | |
| Date | 19th May 1925 | |
| Chassis 93 NK. +8940 Tests carried out from 4.4.25 to 19.5.25 Summary of faults during 15,447 miles. Tested at. | Miles run. | Total miles. | Remarks. --- | --- | --- | --- Chateauroux. | 2,915 | 2,915 | Hole chafed in oil pipe supply to engine gear by front engine guard. Fabric coupling giving way in two places. " | 5,447 | 5,447 | No.2 conrod journal white metal bearing ran out. No.I conrod bearing found cracked. Bottom corner of steering column flange, nearest engine, found broken. (Two new rods fitted & all piston rings replaced by "L" type. New steering column fitted.) & oil relay piston complete with leather - (replace charred leather). " | 6,709 | 6,709 | O.S. step iron (centre) broken at bend. " | 11,234 | 11,234 | N.S.F. road spring - 3rd leaf from bottom - broken. " | 11,485 | 11,485 | New N.S.F. road spring - to Drawing F.71975, 1100 lbs. - fitted. " | 12,235 | 12,235 | O.S.F. road spring found broken replaced by (Drawing F.71975, 1150 lbs.) Battery ignition points burnt out - new points fitted. " | 7,285 | 12,732 | Failure of No.6 conrod. No.I white metal started to run. Nos. 3 & 4 - metal cracked (Six new conrods & pistons, taken from 44 FK - fitted. " | 15,447 | 15,447 | Completion of 10,000 miles on steering column, fabric coupling & oil relay piston. " | 3,962 | | N.S.F. road spring. | 3,212 | | O.S.F. road spring. Total average speed. 40.5 m.p.h. Petrol consumption. 11.59 m.p.g. Oil consumption. 203.06 m.p.g. JHancock | ||