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).
Technical discussion on the practicality of different engine arrangements, specifically regarding valve gear and port spacing.
| Identifier | ExFiles\Box 88\4\ scan0002 | |
| Date | 26th May 1932 | |
| (2) do not actually add more than about .2. The arrangement shown in diagram "E" is not practical as the exhausts and inlets interfere with each other, and cannot be properly cooled. All the arrangements, "E", "F" and "G" where the exhaust ports pass between the push rods demand offset rocker arms, but there is sufficient room between the cylinder studs now for this purpose without any increase in the spacing. E.{Mr Elliott - Chief Engineer} | ||