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).
Modification of 40/50 HP chassis pistons with concave crowns to minimise piston knock.
| Identifier | ExFiles\Box 35\2\ scan 074 | |
| Date | 5th May 1919 | |
| X.2448 To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " BN.{W.O. Bentley / Mr Barrington} " " EH. " " BY.{R.W. Bailey - Chief Engineer} " " EEC COPY. E5/G1/5.5.19. X.3559 RE 40/50 H.P. CHASSIS PISTONS FOR LONG CONNECTING RODS FOR REPAIR WORK' 2448 X. 3559 With reference to the aluminium pistons to be used with the standard long type connecting rods for the 40/50 H.P. engine for repair work it is thought that the design might be improved by the use of concave piston crowns. The object is to minimise the piston knocks. The use of a concave crown allows the bearing surface of the piston to be longer, the extra length being added on the top portion of the piston. The position of the piston pin will be relatively lower. Would you kindly have a modified scheme of the piston for the long rod prepared, incorporating the above, in accordance with Mr. Royce's instructions, and send to West WitteringHenry Royce's home town for his criticism. E.{Mr Elliott - Chief Engineer} (upside down text) R.R. 235A (100 S) (S.P. STS. 16-4-19) CL 2254. | ||