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).
High speed endurance proof test report for a 3.5-litre Bentley competition engine.
| Identifier | ExFiles\Box 90a\2\ Scan268 | |
| Date | 30th July 1934 | |
| x7962 August, 1934. 3½ litre Bentley (Competition work). High Speed Endurance (Proof Test). B.4 Unit (Spec. RHC{R. H. Coverley - Production Engineer}/WSC.{W. S. Cassel}11/EP.{G. Eric Platford - Chief Quality Engineer}30.7.34). Cyl. Head :- EB.1237 (1/C. Mods. as follows. Comp. ratio = 7.75:1 (3 piece metal gasket .025 thick). In. valve EX.12089 ) Inlet seats machined into head. Ex. " EB.1325 ) Tungstone exhaust inset seats. In conjunction with the Ulster T.T. race to be run on Sep. 1st (1934) variable speed endurance running has been carried out on a similar engine as that which has been entered for the race. 7 hours endurance was completed, when No. 5 big-end failed. It is doubtful whether this was an actual bearing failure, or fatigue of other of the component parts. Test at 4000 R.P.M. - 5 hours 15 minutes. at 4250 " - 1 " 10 " at 4500 " - 0 " 35 " Failure occurred while running at 4500 R.P.M. Oil conumption - .85 pts/hr. Sparking plugs K+L.G. 827 - O.K. Previous running on this engine, excluding cyl; head pistons, and bearings = 61 hours on high speed development. C.T. Salt. | ||