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).
Crankcase expansion, bearing thrust, and comparing the reliability of bronze versus mild steel loose bushes.
| Identifier | ExFiles\Box 65\4\ scan0281 | |
| Date | 28th September 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs{Lord Ernest Hives - Chair}/ACL/LG28.9.25. Travel of cyl. block relative to crankshaft due to crankcase expansion. Evidence of thrust on this face of bearing. Front of engine. The std. cars do not show this on the dynamometer. The reason, we think, why the loose bushes give better results than the standard metalled rods is due to the white metal being relieved of local strain which could be caused by slight flexure of the con. rod and consequently a more even pressure distribution. Apart from the two cases mentioned, there seems little to choose between the two types of loose bush. bronze or steel, as shown by the results of our tests. It is thought, however, that mild steel would be more reliable. Hs{Lord Ernest Hives - Chair}/ACL. | ||