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).
Proposal for a new carburetter for chassis X.2766 and X.3511, detailing issues with the current design and suggesting improvements.
| Identifier | ExFiles\Box 39\2\ Scan247 | |
| Date | 24th January 1919 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X.3571. To R.{Sir Henry Royce} from EH. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} EH6/LG24.1.19. 24th Jan. 1919. RE CARBURETTER FOR CHASSIS X.2766 X.3511 We should like to submit the following scheme as a suggestion for a new carburetter for the chassis. Although our present carburetter gives excellent results, we think it might be improved upon in the following ways:- 1. The atomisation is not very good - when we say this we are comparing it with the Claudel carburetter under full throttle conditions. We have examined the atomisation in both cases by means of a glass window. We think, owing to the inferior quality of petrol which is now supplied, atomisation is becoming of utmost importance. 2. Having the fixed size of low speed throat is not ideal for slow speed running. A brief description of a carburetter we suggest is as follows:- The chief feature is that the jet or in this case the emulsion tube is a moving part. The advantage we claim in the moving emulsion tube is, there is always the maximum velocity of air passing the holes which supply the emulsion of petrol and air to the carburetter. The position of the emulsion tube is automatically adjusted to the demand of the engine. The head of the emulsion tube forms an air valve which works in a cylinder. The cylinder has taper slots in it so that as the air valve is lifted the air epasses through these slots into an annular space and so passes the air valve to the throttle; as the air valve or emulsion tube is lifted so more emulsion holes are opened up due to the taper slots. Contd | ||