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).
Issues with chassis 49 GB, covering the engine, pistons, magneto drive, clutch, and dynamo.
| Identifier | ExFiles\Box 35\2\ scan 132 | |
| Date | 22th September 1919 | |
| X.2748. R4/G22.9.19. To EH. from R.{Sir Henry Royce} Copy to CJ. C " " BN.{W.O. Bentley / Mr Barrington} " " DA.{Bernard Day - Chassis Design} " " EFC. RE CHASSIS 49 GB. X.2631. X.2748. The following is a report giving my impressions of the above chassis:- (1) Harsh engine, I think due to connecting rods twisting pistons and causing friction in cylinder. Engine not running free when running without load slowly. EH. thinks engine crankshaft tight on bearing due to refitting. (2) It was distinctly noticed that the pistons were not tight, possible explanation being that the pistons are twisted in the bore, and could not seal the joints in the rings. Leaky pistons spoil slow running and restarting by switching on ignition. (3) X.3530. Magneto drive noisy through temporary omission of brake suggest testing out fabric coupling or serrated coupling, former preferred, if it will bear heat of exhaust. (4) X.1172. If refitting engine does not improve matters as regards vibration or picking up speed, it seems evident that all cars must have separate scuttle from dash (i.e. rubber insulated) or compression must be reduced. Suggest doing both to reduce picking up vibration. (5) The clutch was not good. See other letter suggesting certain investigations to see why this is worse than 7 CA and 1 EX (found dry and practically cured by castor oil.) (6) X.3232. Somewhere about the dynamo more noise than necessary and formerly. Why is the dynamo on 49 GB giving 10 amperes, which seems too much, and perhaps it is not cutting in early enough. Also it might be found advantageous to reduce the ammeter maximum reading to 15 amperes when it is found convenient, so as to shew the smaller currents taken for the ignition and other purposes more clearly. Contd. | ||