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).
Tests for 25 HP high-speed engine roughness, focusing on the flywheel and bearings.
| Identifier | ExFiles\Box 137\4\ scan0126 | |
| Date | 23th November 1930 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Hn.{F. C. Honeyman - Retail orders} c. to Sg.{Arthur F. Sidgreaves - MD} Hor. c. to F.{Mr Friese} Ry. c. to Da.{Bernard Day - Chassis Design} Rg.{Mr Rowledge} 8634 Hs{Lord Ernest Hives - Chair}/Hn.{F. C. Honeyman - Retail orders}3/AJ.23.11.30. X. 634. 25 HP. HIGH SPEED ENGINE ROUGHNESS. We have now repeated our tests on the flywheel having a tail bearing. We arranged the camshaft so that the valves did not bounce until 4500 R.P.M. We also re-bedded the main bearings which had become slack in our previous tests. The tail bearing was arranged as shewn. The car was driven under its own power. The results were so good that we could run up to 55 M.P.H. in third speed (4200 R.P.M.) with less roughness than we get at 3200 R.P.M. on the standard car. It is so seldom that we find such a complete solution to any trouble that we think it would be a mistake not to try and take advantage of it in a design, although we appreciate the difficulties which exist. The tail bearing has no effect on the 50 M.P.H. over-run boom (similar to the 40 M.P.H. boom on 18-G4) which is of course one of the most unpleasant features on the standard car. We are working on this low speed boom on both 40/50 and 20 HP. cars. A full report on the high speed roughness will follow. We shall shortly have a second lightened type flywheel running to compare with these results. Hs{Lord Ernest Hives - Chair}/Hn.{F. C. Honeyman - Retail orders} | ||