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).
Typed extract discussing the effectiveness of plunger rings and cast iron pistons.
| Identifier | ExFiles\Box 41\1\ Scan074 | |
| Date | 22th December 1919 | |
| Contd. -2- extract from R1/G22.12.19. is above the plunger and should be more effective. We have asked if a stiffer or wider ring is more effective. I have not heard which cast iron piston which we have used in the past is considered the best. R.{Sir Henry Royce} | ||