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).
Failures and proposed improvements for a petrol pump, carburetter, and oil level indicator.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page277 | |
| Date | 26th February 1933 guessed | |
| - 5 - noisy in periods. The ball vibrated with a high frequency giving off a noise similar to a horn. It was affected by the load on the second release valve. Various loads of the spring did not cure it. PETROL PUMP LOP E 100860 LEG 3184 FITTED WITH SINGLE PLY BLADDER DIAPHRAGM AND ONE AC DIAPHRAGM. The petrol pump gave no failure until it was disconnected during a days test with gravity tank fitted. Upon connecting up the pump it was found that the fabrics had torn. (9500 miles) We believe that the failure had been gradually developing and was aggravated by running the pump dry. The reason we state a gradual failure had been taken place was because of the time taken to start the engine after standing the night. The fitting of new fabrics brought the starting up to normal. The new design making the pipe line from the filter to the pump more flexible completely cured the trouble of fractures experienced with the previous car. CARBURETTER LOP E 100762 LEG 3157 - 3181-3-7. As stated previously in the report the carburetter was not final and improvements are to be made to obtain better petrol consumptions. Faulty starting of a morning was due to the float chamber becoming dry after the car stood all night. Various tests proved that this was not due to siphoning or leaks but that the petrol evaporated. With the float chamber full, no trouble was experienced with starting. With an autovac feed this feature does not occour. We had no trouble with any other unit of the carburetter. OIL LEVEL INDICATOR LOP E 100988 LEG 3322. The oil level indicator is not positively linked up with the float and on many occasions the needle mechanism did not register the correct amount of oil. It was very unreliable. The design is such that the indicator finger is returned to full position by a loaded piston. The mechanism is too sensitive and is put out of action by the ingress of fine grit. | ||