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).
Results of a 105-hour engine bench test with split type pistons, including running hours at different RPMs and a summary of failures.
| Identifier | ExFiles\Box 77\3\ scan0017 | |
| Date | 11th November 1919 | |
| To R.{Sir Henry Royce} from EH. c. to CJ. c. to EN. c. to R.{Sir Henry Royce} c. to BA. c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} X.8/32 EHR/LG7.11.19. RE SILENT PISTONS - SPLIT TYPE. We have now complete 105 hours running on the Bench with the engine fitted with split type pistons. The condition of running has been as follows:- Full Throttle running. Revs. Hours run. 1000 24 1200 9 1/2 1400 3 1500 15 1/2 1600 24 1700 15 1900 5 1/2 2000 50 2 hrs. light running The failures during this run have been:- 3 Inlet Valve Springs breaking. 1 Valve Spring Washer breaking. 3 Gudgeon Pin lock screws breaking. 2 Seized pistons. As we pointed out in our previous memo, we examined the pistons after 60 hours running - which had comprised of:- Contd. H H 880A (1000 B'ks 8D. P. 8/E.{Mr Elliott - Chief Engineer} 575. 16-4-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2354. | ||