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 10,000-mile test of the latest type of split aluminium pistons, detailing engine knock issues.
| Identifier | ExFiles\Box 77\3\ scan0109 | |
| Date | 7th February 1920 | |
| x3751 Hs.{Lord Ernest Hives - Chair} from EP.{G. Eric Platford - Chief Quality Engineer} c. to Bn.{W.O. Bentley / Mr Barrington} c. to WOR.{Arthur Wormald - General Works Manager} EP{G. Eric Platford - Chief Quality Engineer}2/F7.2.20. RE. 10,000 MILES TEST OF LATEST TYPE SPLIT ALUMINIUM PISTONS. Yesterday's run on chassis 53-CW - 249 miles. Total miles run since pistons fitted - 3898 " Report:- We have now dismantled the cylinders and pistons off this car and transferred them to another chassis, No. 36-TW. The final test of this car prior to doing this work was made by you and myself on which it was demonstrated that there was a light load knock which was the worst feature, and which could be reduced and practically cut out altogether by the shorting of No.6 cylinder. This knock, however, disappeared as the load was applied to the engine, but after the engine had been run at slow speeds heavy load for a short time, there was a piston knock which could be cut out by shorting No.1 cylinder. Detonations were also pronounced. EP.{G. Eric Platford - Chief Quality Engineer} | ||