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).
Comparison of different manifold pipe designs with engineering notes.
| Identifier | WestWitteringFiles\R\January1928-March1928\ 27 | |
| Date | 24th January 1928 guessed | |
| (2) TYPE 2. These plugs are carried round but I fear this is limited to a very small amount. This has the least heating, etc. The larger this radius the more efficient the pipe because of the better delivery - i.e. the more it gets round. TYPE 3. Mercedes do this outside the bonnet: looks like brass flexible pipe. We might try it on paper inside the bonnet, perhaps for sports only. | ||