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).
Specifications for the combustion head, valve push rods, and rocker mechanism.
| Identifier | WestWitteringFiles\J\January1923\ Scan62 | |
| Date | 12th January 1923 guessed | |
| (2) of the combustion head given have been obtained from approximate calculations only. We want these to be accurately determined in Derby by means of a model. The tubes which carry the valve push rods through the head should be tried in monel metal with a view to avoiding corrosion. Referring again to the rocker mechanism this is arranged in two groups, one group embracing cylinders 1, 2, & 3, and the other group embracing cylinders 4, 5, & 6. Each group is provided with a central dowel on the central bracket and each end of bracket of each group is provided with a tongue engaging with a groove machined in the head. The stud holes of all brackets except the central ones of each group should be made .062 clear on the diameter. With these provisions each valve rocker group should go into it's correct place with certainty and without trouble. It will be as well to mention that the valve push rods slope in the side elevation as well as in the end elevation, their centres at the top being further apart by .2" at the top than at the bottom relative to each cylinder. E.{Mr Elliott - Chief Engineer} | ||