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).
General notes on magnetos and frames, with a detailed analysis of electric and hydraulic petrol pumps.
| Identifier | ExFiles\Box 124\5\ scan0013 | |
| Date | 6th November 1930 | |
| -2- Hs{Lord Ernest Hives - Chair}/IAL.1/MJ.6.11.30.Contd. vertical out of balance from 3000 R.P.M. to 6000 R.P.M. Both this car and the Lorraine have a bearing each side of the flywheel. GENERAL POINTS. Several cars have magnetos with two distributors the second being for the purpose of coil ignition. This saves the necessity for two drives for dual ignition. Crosses in the frame are used by many cars, with apparent satisfaction. The S.U.Co., have brought out two types of petrol pumps. one is an electric called the "Petrolift". This has a cork float to keep a constant head of petrol. The other is a hydraulic pump, receiving its power from the engine oil pressure. That is, if the oil pressure fails the firm would get away with the customer complaining of a petrol blockage instead of a seized engine. The principle of this pump will be seen from the enclosed photostat. The following information was received from Mr. Kent the inventor of the petrol pump. - Variation of petrol pressure at top and at bottom of the stroke 1 lbs. per sq. ins. Mean pressure of petrol delivered 2½lbs. per sq. in. Minimum pressure necessary to work pump 4 lbs. per sq.in. The petrol pressure varies slightly with the oil pressure owing to the area of the piston rod. This is approximately 30 to 1 (ratio). They only make one size pump at the present which delivers approx. 30 pints of petrol per hour, but they are considering making a larger one for aircraft. | ||