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).
Various component issues and ongoing modifications for a car model, covering the exhaust, carburation, vacuum pump, clutch, and brakes.
| Identifier | ExFiles\Box 11\2\ 02-page056 | |
| Date | 1st January 1929 guessed | |
| contd :- -2- This w has made the exhaust noisy and gives a poor life. WW. are now in the process of getting out designs to cure this deficiency which should not take long when we have the necessary cars to work on. CARBURATION. We have a water heated induction pipe on the SS.{S. Smith} We are not satisfied with water heating. We shall have, some how, to get satisfactory exhaust heating on this car. Experimentally we are working on the problem now. We think that this is the most difficult proposition we have to tackle on the SS.{S. Smith} VACUUM PUMP. The vacuum pump on the SS.{S. Smith} which draws fuel from the tank to the autovac, is not equal to its work under one or two exceptional sets of conditions. We think that this is only a matter of giving the correct proportions for the pump. CLUTCH. You will recollect that the clutch did not stop very well on the car which we sent to France. We have since found out that this was due to incorrect clearance. We do not think there is any reason why the SS.{S. Smith} clutches should not be as good as the present standard. BRAKES. We started off with the wrong proportion of leverage. We have taken the matter up with DA.{Bernard Day - Chassis Design} and he is making the necessary modifications. The cars that we have rigged up with the experimental modifications to alter the leverage are quite satisfactory. There will undoubtedly be no difficulty here. Owing to incorrect dimensions on the dust cover we have had mud and water penetrating to the rear brake shoes in France and making them ineffective. We have had this trouble before contd :- | ||