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).
Instructions for standardizing the ram pattern of a piston with an eccentric core.
| Identifier | WestWitteringFiles\D\October1919\ Scan28 | |
| Date | 30th October 1919 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -2- E5/G30/10/19 Contd. The piston is balanced by reason of its walls being made of unequal thickness, or to put it in another way, the core of the piston is eccentric. The amount of eccentricity required has not been calculated, but should be dealt with in Derby. It is desired to make the piston wall on the ram side approximately half the thickness of the piston wall on the loaded side. You will find that this does not give a purely eccentric bore. A small hole has been drilled in the trunk through the groove which prevents the ram from turning, for the purpose of letting the air out of the inside of the trunk. The ram should be tried with and without this hole. This drawing is intended to give you complete instructions for standardising the ram pattern of piston. E.{Mr Elliott - Chief Engineer} | ||