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 reduction of piston knocks by adjusting ignition timing.
| Identifier | Morton\M3.7\ img019 | |
| Date | 25th August 1919 | |
| R.R. 235 B (200 T) (S F.{Mr Friese} 103. 25-10-18) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2241. To R.{Sir Henry Royce} from EH. c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to FN. c. to C. ORIGINAL. EH2/LG25.8.19. X 2748 PISTON KNOCKS. A way to greatly reduce piston knocks when an engine is cold is to run with late ignition during the warming up process. * Early ignition makes the knocks much worse. * EH. | ||