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 and suggested remedies for chassis 49 GB.
| Identifier | Morton\M11\ img215 | |
| Date | 1st September 1919 | |
| To Mr. [redacted] from R.{Sir Henry Royce} Copy to GJ. " BN.{W.O. Bentley / Mr Barrington} " DA.{Bernard Day - Chassis Design} " EFC. **************** ORIGINAL. 3 R4/G22/9/19. RE CHASSIS 49 GB. X.2681 / X.2448 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 pistons are twisted in the bore, and could not seal the joints in the rings. Leaky pistons spoil slow running and re-starting by switching on ignition. (3) X3530 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) X1172 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. (7) X.664 The battery was found to have lost nearly all its electrolyte in some cells, suggest some better management at the Works in looking after these cells, as this is the second time a car has arrived here and given rise to inconvenience before the cause of the trouble was found (suggests also smaller charging current when E.M.F. rises. Leak since found in wiring. (Contd.) | ||