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).
Progress report on experimental engines, springing, and axle development.
| Identifier | ExFiles\Box 30\1\ Scan232 | |
| Date | 26th October 1935 guessed | |
| -4- (3) Proposal for an experimental Single Cylinder Unit. If this single cylinder unit is going to be made at all, we should like the design work to speed up. It is going too slowly at present. (4) Big Bore Engine. We shall have a final big bore Bentley engine on test next week. This differs from the one running in France only with regard to modification to the casting to increase the water passages and a modification to the valve gear. The reliability of both these features can really be proved on the test bed. We recommend that we run a 100 hours on the test bed with this engine, and if it is completely satisfactory, and at the same time Hancock complete 15,000 miles in France, we should consider the major parts of the big bore engine as ready for release. We are doing what we can to urge the technique of producing Hall's metal bearings, because we are entirely dependent upon these for the big bore engine. (5) Springing: We are not going to materially improve the Bentley springing until we get independent front wheel springing. At present we believe this is the only way in which we can get increased comfort without loss of controllability. (6) Hypoid Axle: This will be ready in a week's time. (7) Big Bore Engine. We have the stock car ready for the big bore engine. We are preparing a unit for 21-G-IV which will give us a chance to try out the carburetter and induction system on a temporary unit. The final parts, however, are not going fast enough. The detailing has not yet started on the cylinder head, owing to SpectreCodename for Phantom III work taking preference. The cylinder head is the longest distance job, and we think that something might be done to enable it to proceed without stopping the SpectreCodename for Phantom III. The designs for the carburetter and induction system have not yet been issued, but in any case they will probably catch up with the cylinder head. | ||