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).
The condition of a Bentley Chassis and Engine Unit after a 17,000-mile test in France.
| Identifier | ExFiles\Box 83\1\ scan0269 | |
| Date | 6th November 1930 | |
| 20dd To. M.{Mr Moon / Mr Moore} from RHC{R. H. Coverley - Production Engineer}/RH.{R. Hollingworth} [text crossed out] [text crossed out] [text crossed out] [text crossed out] [text crossed out] [Handwritten note left side]: Les Smith AF.H. AFH file- [Handwritten note top right]: GRY{Shadwell Grylls}- Have taken out Cyl wear figures Rm{William Robotham - Chief Engineer} BENTLEY CHASSIS 6.B.IV. - UNIT R.22. We give below report on condition of the above after 17,000 Miles test in France. ENGINE UNIT R.22 With the exception of bearings - general condition good. -------- Crankcase. Top Half EB.2828. Lower Half EB.1855. General condition good. Chalk tested for cracks and found O.K. Main bearings. EB.2809-11-14 & RM.{William Robotham - Chief Engineer}67 (Rear Brg.) in Hall's solid metal (A.C.7). All bearings scored in the bore and badly distorted, for dimensions see EX.I.67. These bearings have hammered and become oval in bore the greatest ovality being vertically. The bore in the top half crankcase and bearing caps is also oval, the greatest ovality being horizontal. Investigation into the sectional thickness of bearing bushes show a maximum difference of .0105, the thinnest section being vertical. In addition there is a maximum gap between the two halves of the bearings of .011". For future records of bearing tests we suggest that measurements be taken before and after test of - Crankshaft journal on two diameters. Bore of main bearing bushes on two diameters. Bore in crankcase and bearing caps on two diameters. Sectional thickness of bearing bushes in three places. -------- Cylinders. Cylinder head EB.2560. Block EB.2929 Quantity of carbon collected in the inlet ports behind the inlet valves, see EX.I.74. This condition is worse in Nos. 2 & 4 ports, but all inlet ports have this tendency to build up carbon. Cylinder block incorporating Loc.5117 and RM.{William Robotham - Chief Engineer}111 - general condition good, for measurements see chart. continued | ||