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).
Typed letter responding to a report, diagnosing car performance issues regarding maximum speed, crankshaft period, and transmission rattles.
Identifier | ExFiles\Box 82\1\ scan0166 | |
Date | 3rd August 1933 | |
V553a Mr. G.W.Hancock, c/o Hotel de France, Chateauroux, Indre. FRANCE. To Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}12/KT.3.8.33. Your Daily Report of 31.7.33 to hand, also your telegram re. petrol pump. There is still a certain amount of mystery as to why your car is so bad, but since your tests are so consistent, we shall have to have another go. It is unfortunate that we have no French petrol here so that we can follow your results exactly. Dealing with the points raised :- (1) Maximum Speed. We presume this is corrected maximum. We should like you to make sure that you are really weak enough at high speeds now. We have found out that if we set the needles for slow running, owing to the 4 lbs/sq.in. delivery of the pump, which is equal to a 12 ft. head, the mixture may be too strong at maximum revs. Generally speaking removing the air silencer will at once indicate whether you are too strong because if you pick up performance by removing the air silencer it is equivalent to weakening the mixture. (2) Half Crankshaft Period. You will realise that you are getting this because you have Ferodo discs on the slipper wheel. When you have done enough mileage to be certain of the mechanical features of this car, you can return to this and set it so that the trouble will be eliminated. (3) Rattles in the Transmission. This again is serious, and when you have done more miles it must be investigated. I thought that on this car it was an abnormally bad rattle and we should like to know whether you think it comes from the gearbox | ||