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 various engine parts after a run, detailing issues and running hours.
| Identifier | ExFiles\Box 36\2\ scan 202 | |
| Date | 1st March 1929 guessed | |
| contd :- -2- During the run the induction manifolds were leaking mixture at the ends of the flanges. This trouble is not new and we should say it was due to distortion as there is an appreciable temperature difference between cylinder block and manifold when running, whereas, when fitted, both are at the same temperature. We think this could be cured by placing two extra studs on each manifold in the positions marked in the appended sketch. Condition of engine parts after run. PISTONS. Run since new - 34 1/4 hrs. " last cleaned - 30 hrs. All pistons were O.K. after the run. We noticed there was a considerable amount of carbon deposited on the pistons. At the high temperatures produced by detonation carbon would be deposited readily. CONNECTING RODS. Run - six on A3.4.5. and B3.4.5. - 326 hrs. four " A1.2. " B1.2. - 278 hrs. 35 m.{Mr Moon / Mr Moore} two " A6. " B6. - 269 hrs. 15 m.{Mr Moon / Mr Moore} All O.K. after 20 hrs. running. GUDGEON PINS. Run - 122 hrs. 30 mins. All O.K. after run. MAIN BEARINGS. Run - 51 hrs. All O.K. BIG END BEARINGS. Run - 51 hrs. Top halves of bearings - whitemetal cracked or broken away chiefly at point where the thrust from plain rod is contd :- | ||