10,000-mile test of the latest type of split aluminium pistons, detailing a persistent engine knocking issue.
| Identifier | ExFiles\Box 77\3\ scan0115 | |
| Date | 12th February 1920 | |
| X 3757 Hs. {Lord Ernest Hives - Chair} from EP. {G. Eric Platford - Chief Quality Engineer} c. to BN. {W.O. Bentley / Mr Barrington} [text struck through] c. to WOR. {Arthur Wormald - General Works Manager} [text struck through] EP {G. Eric Platford - Chief Quality Engineer} 5/F12.2.20. RE. 10,000 MILES TEST OF LATEST TYPE SPLIT ALUMINIUM PISTONS. Yesterday's run on chassis 36-TW - 336 miles. Total miles since pistons fitted - 5430. Report :- Engine dismantled - carbon deposit cleaned off top band of pistons, also from bore of cylinders. Carbon left on combustion head and crown of piston. When engine re-erected, elusive knocks not noticeable, but re-appeared intermittently after 20 miles running. After 300 miles, knocks still as bad as before. EP. {G. Eric Platford - Chief Quality Engineer} | ||
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).